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List of cetaceans

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?Cetaceans
Fossil range: Template:Fossilrange
Bottlenose Dolphin breaching
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Subphylum: Vertebrata
Class: Mammalia
Order: Cetacea
Brisson, 1762

This is a list of cetaceans. The order Cetacea includes whales, dolphins, and porpoises. It has just over eighty living species, divided into the suborders Odontoceti (the toothed whales, including dolphins and porpoises) and Mysticeti (the baleen whales). In addition, numerous species of extinct cetaceans exist, but they are not listed here. This list contains only the known, extant cetacean species including several recent discoveries (the Baiji is also included though it is believed to have gone extinct in 2006).

Cetaceans are aquatic mammals characterised by having a fusiform (streamlined) body shape, paddle-shaped front limbs and vestigial hind limbs. The tail has been flattened into a fluke to aid propulsion.

Suborder Mysticeti: baleen whales Edit

Main article: Mysticeti

The baleen whales, also called whalebone whales or great whales, form the Mysticeti, one of two suborders of the Cetacea (whales, dolphins and porpoises). Baleen whales are characterized by having baleen plates for filtering food from water, rather than having teeth, like with the Odontocetes. This distinguishes them from the other suborder of cetaceans, the toothed whales or Odontoceti. Living Mysticeti species have teeth only during the embryonal phase. Fossil Mysticeti had teeth before baleen evolved.

Family Balaenidae: Right Whales Edit

See also: Balaenidae

Balaenidae is a family of cetaceans that contains two genera. Commonly called the Right Whales as it contains mainly Right Whale species. This name can be confusing, however, since one of the species is the Bowhead Whale, which is different to the Right Whale. All the Balaenidae whales have the following features: a smooth belly and chin, with no ventral grooves; a distinctive head shape with strongly arched, narrow rostrum (anatomy) and bowed lower jaw; lower lips that enfold the sides and front of the rostrum; long, narrow, elastic baleen plates (up to 9 times longer longer than wide) with fine baleen fringes; the fusion of all the cervical vertebrae and other skeletal characteristics; a slow swimming speed.[1]

colspan="100%" align="center" Template:Bgcolor-blue|Genus Balaena Linnaeus, 1758 – 1 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Bowhead Whale Balaena mysticetus
Linnaeus, 1758
Conservation Dependent (LR/cd) 8,000–9,200 150px 150px
60 tonnes
150px
colspan="100%" align="center" Template:Bgcolor-blue|Genus Eubalaena Gray, 1864 – 3 species
Common nameScientific nameStatusPopulationDistributionSizePicture
North Atlantic Right Whale Eubalaena glacialis
Müller, 1776
Endangered (EN) 300 150px 150px
40–80 tonnes
150px
North Pacific Right Whale Eubalaena japonica
Lacépède, 1818
Endangered (EN) 200 150px 150px
60–80 tonnes
150px
Southern Right Whale Eubalaena australis
Desmoulins, 1822
Least Concern (LR/lc) 7,000 150px 150px
40–80 tonnes
150px

Family Balaenopteridae: Rorquals Edit

See also: Balaenopteridae

Rorquals are the largest group of baleen whales, with nine species in two genera. They include the largest animal that has ever lived, the Blue Whale, which can reach 150 tonnes, two others that easily pass 50 tonnes, and even the smallest of the group, the Northern Minke Whale, reaches 9 tonnes.

Rorquals take their name from a Norwegian word meaning "furrow whale": all members of the family have a series of longitudinal folds of skin running from below the mouth back to the navel (except the Sei Whale, which has shorter grooves). These are understood to allow the mouth to expand immensely when feeding.

All rorquals have ventral grooves, and are the only cetaceans to have them. Additionally, they all have a dorsal fin, a broad, gently curving rostrum and short baleen plates.[1]

Subfamily Balaenopterinae – 1 genus, 8 species
colspan="100%" align="center" Template:Bgcolor-blue|Genus Balaenoptera – 8 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Blue Whale Balaenoptera musculus
Linnaeus, 1758
Endangered (EN) 5,000–12,000 150px 150px
100–120 tonnes
150px
Bryde's Whale Balaenoptera brydei
Olsen, 1913
Data deficient (DD) 90,000–100,000 150px 150px
16–18.5 tonnes
150px
Common Minke Whale Balaenoptera acutorostrata
Lacépède, 1804
Near Threatened (LR/nt) Unknown 150px 150px
9 tonnes
150px
Fin Whale Balaenoptera physalus
Linnaeus, 1758
Endangered (EN) 64,000 150px 150px
45–75 tonnes
150px
Pygmy Bryde's Whale Balaenoptera edeni
Anderson, 1879
Unknown Unknown 150px
Sei Whale Balaenoptera borealis
Lesson, 1828
Endangered (EN) 57,000 150px 150px
20–25 tonnes
150px
Southern Minke Whale Balaenoptera bonaerensis
Burmeister, 1867
Conservation Dependent (LR/cd) Unknown 150px 150px
9 tonnes
150px
Omura's whale Balaenoptera omurai
Wada et al., 2003
Unknown Unknown 150px
Subfamily Megapterinae – 1 genus, 1 species
colspan="100%" align="center" Template:Bgcolor-blue|Genus Megaptera Gray, 1846 – 1 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Humpback Whale Megaptera novaeangliae
Borowski, 1781
Least Concern (LR/lc) 80,000 150px 150px
25–30 tonnes
150px

Family Eschrichtiidae: Gray Whale Edit

See also: Eschrichtiidae

The Gray Whale has been placed in a family of its own as it is sufficiently different from the right whales and the rorquals. The Gray Whale is the only benthic feeding baleen whale, filtering small organisms from the mud of shallow seas. They also have a gestation period of over a year, which is unusual for baleen whales.[1]

colspan="100%" align="center" Template:Bgcolor-blue|Genus Eschrichtius – 1 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Gray Whale Eschrichtius robustus
Lilljeborg, 1861
Conservation Dependent (LR/cd) 26,000 150px 150px
14–35 tonnes
150px

Family Neobalaenidae: Pygmy Right Whale Edit

See also: Neobalaenidae

The Pygmy Right Whale shares several characteristics with the Right Whales although what separates them from Right Whales is that they have a dorsal fin, and they have a very distinctive jaw configuration. Pygmy Right Whales also have a head no more than ¼ the size of their body, whereas the Right Whales have heads approximately ⅓ the size of their body.[1]

colspan="100%" align="center" Template:Bgcolor-blue|Genus Caperea Gray, 1864 – 1 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Pygmy Right Whale Caperea marginata
Gray, 1846
Least Concern (LR/lc) Unknown 150px 150px
3-3.5 tonnes
150px

Suborder Odontoceti: toothed whalesEdit

Main article: Odontoceti

The toothed whales (systematic name Odontoceti) form a suborder of the cetaceans. As the name suggests, the suborder is characterized by having teeth (rather than baleen). Toothed whales are active hunters, feeding on fish, squid, and in some cases other marine mammals.

Family Delphinidae: Oceanic DolphinsEdit

See also: Delphinidae

Oceanic dolphins are the members of the Delphinidae family of cetaceans. These aquatic mammals are related to whales and porpoises. As the name implies, these dolphins tend to be found in the open seas, unlike the river dolphins, although a few species such as the Irrawaddy Dolphin are coastal or riverine. Six of the larger species in the Delphinidae, the Orca and its relatives, are commonly called whales, rather than dolphins. They are also sometimes collectively known as "blackfish".

The Delphinidae are characterised by having a distinct beak (unlike the Porpoises), two or more fused cervical vertebrae and 20 or more pairs of teeth in the upper jaw. None are more than 4 metres long.[1]

colspan="100%" align="center" Template:Bgcolor-blue|Genus Cephalorhynchus Gray, 1846 – 4 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Commerson's Dolphin Cephalorhynchus commersonii
Lacépède, 1804
Data deficient 3,400 150px 150px
35–60 kilograms
Commdolph01
Chilean Dolphin Cephalorhynchus eutropia
Gray, 1846
Data deficient Unknown 150px 150px
60 kilograms
150px
Heaviside's Dolphin Cephalorhynchus heavisidii
Gray, 1828
Data deficient Unknown 150px 150px
40–75 kilograms
150px
Hector's Dolphin Cephalorhynchus hectori
Van Beneden, 1881
Endangered (EN) 2,000–2,500 150px 150px
35–60 kilograms
150px
colspan="100%" align="center" Template:Bgcolor-blue|Genus Steno – 1 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Rough-toothed Dolphin Steno bredanensis
Lesson, 1828
Data deficient 150,000 150px 150px
100–135 kilograms
150px
colspan="100%" align="center" Template:Bgcolor-blue|Genus Sousa – 3 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Atlantic Humpback Dolphin Sousa teuszi
Kükenthal, 1892
Data deficient Unknown 150px 150px
100–150 kilograms
Indian Humpback Dolphin Sousa plumbea
Cuvier, 1829
Data deficient Unknown 150px 150px
150–200 kilograms
Pacific Humpback Dolphin Sousa chinensis
Osbeck, 1765
Data deficient Unknown 150px 150px
250–280 kilograms
150px
colspan="100%" align="center" Template:Bgcolor-blue|Genus Sotalia – 1 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Tucuxi Sotalia fluviatilis
Gervais & Deville, 1853
Data deficient Unknown 150px 150px
35–45 kilograms
150px
colspan="100%" align="center" Template:Bgcolor-blue|Genus Tursiops – 2 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Common Bottlenose Dolphin Tursiops truncatus
Montagu, 1821
Data deficient Unknown 150px 150px
150–650 kilograms
150px
Indo-Pacific Bottlenose Dolphin Tursiops aduncus
Ehrenberg, 1833
Data deficient Unknown 150px 150px
150–650 kilograms
150px
colspan="100%" align="center" Template:Bgcolor-blue|Genus Stenella Gray, 1866 – 5 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Atlantic Spotted Dolphin Stenella frontalis
Cuvier, 1829
Data deficient 100,000 150px 150px
100 kilograms
150px
Clymene Dolphin Stenella clymene
Gray, 1846
Data deficient Unknown 150px 150px
75–80 kilograms
150px
Pantropical Spotted Dolphin Stenella attenuata
Gray, 1846
Conservation Dependent (LR/cd) 3,000,000 150px 150px
100 kilograms
150px
Spinner Dolphin Stenella longirostris
Gray, 1828
Conservation Dependent (LR/cd) Unknown 150px 150px
90 kilograms
150px
Striped Dolphin Stenella coeruleoalba
Meyen, 1833
Conservation Dependent (LR/cd) 2,000,000 150px 150px</br>100 kilograms 150px
colspan="100%" align="center" Template:Bgcolor-blue|Genus Delphinus – 3 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Short-beaked common dolphin Delphinus delphis
Linnaeus, 1758
Least Concern (LC) 150px 150px
70–110 kilograms
150px
Arabian Common Dolphin Delphinus tropicalis
van Bree, 1971
Unknown Unknown 150px
65–105 kilograms
150px
Long-beaked Common Dolphin Delphinus capensis
Gray, 1828
Conservation Dependent (LR/cd) Unknown[2] 150px 150px
80–150 kilograms
150px
colspan="100%" align="center" Template:Bgcolor-blue|Genus Lagenodelphis – 1 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Fraser's Dolphin Lagenodelphis hosei
Fraser, 1956
Data deficient Unknown 150px 150px
209 kilograms
150px
colspan="100%" align="center" Template:Bgcolor-blue|Genus Lagenorhynchus Gray, 1846 – 6 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Atlantic White-sided Dolphin Lagenorhynchus acutus
Gray, 1828
Least Concern (LR/lc) 200,000 – 300,000 150px 150px
235 kilograms
150px
Dusky Dolphin Lagenorhynchus obscurus
Gray, 1828
Data deficient Unknown 150px 150px
100 kilograms
150px
Hourglass Dolphin Lagenorhynchus cruciger
Quoy & Gaimard, 1824
Least Concern (LR/lc) 140,000 150px 150px
90–120 kilograms
150px
Pacific White-sided Dolphin Lagenorhynchus obliquidens
Gill, 1865
Least Concern (LR/lc) 1,000,000 150px 150px
85–150 kilograms
150px
Peale's Dolphin (also known as Black-chinned Dolphin) Lagenorhynchus australis
Peale, 1848
Data deficient Unknown[3] 150px 150px
115 kilograms
150px
White-beaked Dolphin Lagenorhynchus albirostris
Gray, 1846
Least Concern (LR/lc) 100,000[4] 150px 150px
180 kilograms
150px
colspan="100%" align="center" Template:Bgcolor-blue|Genus Lissodelphis – 2 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Northern Right Whale Dolphin Lissodelphis borealis
Peale, 1848
Least Concern (LR/lc) 400,000[5] 150px 150px
115 kilograms
150px
Southern Right Whale Dolphin Lissodelphis peronii
Lacépède, 1804
Data deficient Unknown[6] 150px 150px
60–100 kilograms
colspan="100%" align="center" Template:Bgcolor-blue|Genus Grampus – 1 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Risso's Dolphin Grampus griseus
G. Cuvier, 1812
Data deficient Unknown[7] 150px 150px
300 kilograms
150px
colspan="100%" align="center" Template:Bgcolor-blue|Genus Peponocephala – 1 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Melon-headed Whale Peponocephala electra
Gray, 1846
Least Concern (LR/lc) Unknown[8] 150px 150px
225 kilograms
150px
colspan="100%" align="center" Template:Bgcolor-blue|Genus Feresa – 1 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Pygmy Killer Whale Feresa attenuata
Gray, 1875
Data deficient Unknown[9] 150px 150px
160–350 kilograms
colspan="100%" align="center" Template:Bgcolor-blue|Genus Pseudorca – 1 species
Common nameScientific nameStatusPopulationDistributionSizePicture
False Killer Whale Pseudorca crassidens
Owen, 1846
Least Concern (LR/lc) Unknown[10] 150px 150px
1.5-2 tonnes
150px
colspan="100%" align="center" Template:Bgcolor-blue|Genus Orcinus – 1 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Orca Orcinus orca
Linnaeus, 1758
Conservation Dependent (LR/cd) 100,000[11] 150px 150px
4.5 tonnes
Killerwhales jumping
colspan="100%" align="center" Template:Bgcolor-blue|Genus Globicephala – 2 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Long-finned Pilot Whale Globicephala melas
Traill, 1809
Least Concern (LR/lc) Unknown[12] 150px 150px
3-3.5 tonnes
150px
Short-finned Pilot Whale Globicephala macrorhynchus
Gray, 1846
Conservation Dependent (LR/cd) Unknown[13] 150px 150px
1–3 tonnes
150px
colspan="100%" align="center" Template:Bgcolor-blue|Genus Orcaella Gray, 1866 – 2 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Australian Snubfin Dolphin Orcaella heinsohni
Beasley, Robertson & Arnold, 2005
Unknown Unknown 150px 150px
130–145 kilograms
Irrawaddy Dolphin Orcaella brevirostris
Gray, 1866
Data deficient Unknown 150px 150px
130 kilograms

Family Monodontidae: Narwhal and BelugaEdit

See also: Monodontidae

The cetacean family Monodontidae comprises two unusual whale species, the Narwhal, in which the male has a long tusk, and the white Beluga.

The Monodontidae lack a dorsal fin which has been replaced by a tough fibrous ridge just behind the midpoint of the body and is probably an adaptation to swimming under ice, as both do in their Arctic habitat. The flippers are small, rounded and tend to curl up at the ends in adulthood. All, or almost all, the cervical vertebrae are unfused allowing the head to be turned independently of the body. None have any throat grooves.[1]

colspan="100%" align="center" Template:Bgcolor-blue|Genus Monodon – 1 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Narwhal Monodon monoceros
Linnaeus, 1758
Data deficient 25,000[14] 150px 150px
900-1,500 kilograms
150px
colspan="100%" align="center" Template:Bgcolor-blue|Genus Delphinapterus – 1 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Beluga Delphinapterus leucas
Pallas, 1776
Vulnerable (VU) 100,000[15] 150px 150px
1.5 tonnes
150px

Family Phocoenidae: PorpoisesEdit

See also: Phocoenidae

The porpoises are small cetaceans of the family Phocoenidae. They are distinct from dolphins, although the word "porpoise" has been used to refer to any small dolphin, especially by sailors and fishermen. The most obvious visible difference between the two groups is that porpoises have spatulate (flattened) teeth distinct from the conical teeth of dolphins. In addition, porpoises are relatively r-selected compared with dolphins: that is, they rear more young more quickly than dolphins. All six species have small flippers, notched tail flukes, and no beak. All carry at least 11 pairs of small teeth in the upper and lower jaws.

Porpoises, divided into six species, live in all oceans, mostly near the shore. Probably best known is the Harbour Porpoise, which can be found across the Northern Hemisphere.

colspan="100%" align="center" Template:Bgcolor-blue|Genus Neophocaena – 1 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Finless Porpoise Neophocaena phocaenoides
Cuvier, 1829
Data deficient[16] Unknown[17] 150px 150px
30–45 kilograms
150px
colspan="100%" align="center" Template:Bgcolor-blue|Genus Phocoena – 4 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Harbour Porpoise Phocoena phocoena
Linnaeus, 1758
Vulnerable (VU) Unknown[18] 150px 150px
75 kilograms
150px
Vaquita Phocoena sinus
Norris & McFarland, 1958
Critically Endangered (CR) 500[19] 150px 150px
50 kilograms
Spectacled Porpoise Phocoena dioptrica
Lahille, 1912
Data deficient Unknown[20] 150px 150px
60–84 kilograms
150px
Burmeister's Porpoise Phocoena spinipinnis
Burmeister, 1865
Data deficient Unknown[21] 150px 150px
50–75 kilograms
colspan="100%" align="center" Template:Bgcolor-blue|Genus Phocoenoides – 1 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Dall's Porpoise Phocoenoides dalli
True, 1885
Conservation Dependent (LR/cd) 1,100,000[22] 150px 150px
130–200 kilograms
150px

Family Physeteridae: Sperm Whale Edit

See also: Physeteridae

The Sperm Whale characteristically has a large, squarish head ⅓ the length of its body; the blowhole is slightly to the left hand side; skin usually wrinkled; and no teeth on the upper jaw.

colspan="100%" align="center" Template:Bgcolor-blue|Genus Physeter – 1 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Sperm Whale Physeter macrocephalus
Linnaeus, 1758
Vulnerable (VU) 200,000–2,000,000[23] 150px 150px
25–50 tonnes
150px

Family Kogiidae: Dwarf and Pygmy Sperm WhalesEdit

See also: Kogiidae

The Dwarf and Pygmy Sperm Whales resemble Sperm Whales, but are far smaller. They are dark grey, dorsally, while ventrally they are lighter. They have blunt, squarish heads with a narrow underslung jaw; the flippers are set far forward, close to the head and the dorsal fin is set far back down the body.

colspan="100%" align="center" Template:Bgcolor-blue|Genus Kogia – 2 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Dwarf Sperm Whale Kogia sima
Owen, 1866
Least Concern (LR/lc) Unknown[24] 150px 150px
250 kilograms
Pygmy Sperm Whale Kogia breviceps
Blainville, 1838
Least Concern (LR/lc) Unknown[24] 150px 150px
400 kilograms
150px

Family Ziphiidae: Beaked Whales Edit

See also: Ziphiidae

A beaked whale is any of at least 20 species of small whale in the family Ziphiidae. They are one of the least-known families of large mammals: several species have only been described in the last two decades, and it is entirely possible that more remain as yet undiscovered. Six genera have been identified.

They possess a unique feeding mechanism known as suction feeding. Instead of catching their prey with teeth, it is sucked into their oral cavity. Their tongue can move very freely, and when suddenly retracted at the same time as the gular floor is distended, the pressure immediately drops within their mouth and the prey is sucked in with the water. The family members are characterized by having a lower jaw that extends at least to the tip of the upper jaw, a shallow or non-existent notch between the tail flukes, a dorsal fin set well back on the body, three of four fused cervical vertebrae, extensive skull asymmetry and two conspicuous throat grooves forming a 'V' pattern.[1]

colspan="100%" align="center" Template:Bgcolor-blue|Genus Ziphius – 1 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Cuvier's Beaked Whale Ziphius cavirostris
G. Cuvier, 1823
Data deficient Unknown[25] 150px 150px
2–3 tonnes
150px
colspan="100%" align="center" Template:Bgcolor-blue|Genus Berardius – 2 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Arnoux's Beaked Whale Berardius arnuxii
Duvernoy, 1851
Conservation Dependent (LR/cd) Unknown[26] 150px 150px
8 tonnes
150px
Baird's Beaked Whale Berardius bairdii
Stejneger, 1883
Conservation Dependent (LR/cd) Unknown[27] 150px 150px
12 tonnes
colspan="100%" align="center" Template:Bgcolor-blue|Genus Tasmacetus – 1 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Shepherd's Beaked Whale Tasmacetus shepherdi
Oliver, 1937
Data deficient Unknown[28] 150px 150px
2-2.5 tonnes
Subfamily Hyperoodontidae – 3 genera, 17 species
colspan="100%" align="center" Template:Bgcolor-blue|Genus Indopacetus – 1 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Longman's Beaked Whale Indopacetus pacificus
Longman, 1926
Data deficent Unknown[29] 150px 150px
3,5-4 tonnes
colspan="100%" align="center" Template:Bgcolor-blue|Genus Hyperoodon – 2 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Northern Bottlenose Whale Hyperoodon ampullatus
Forster, 1770
Conservation Dependent (LR/cd) 10,000[30] 150px 150px</br>7 tonnes 150px
Southern Bottlenose Whale Hyperoodon planifrons
Flower, 1882
Conservation Dependent (LR/cd) 500,000[31] 150px 150px</br>6 tonnes
colspan="100%" align="center" Template:Bgcolor-blue|Genus Mesoplodon Gervais, 1850 – 14 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Andrews' Beaked Whale Mesoplodon bowdoini
Gervais, 1850
Data deficient Unknown 150px 150px
1 tonne
Spade-toothed whale Mesoplodon traversii, syn. Mesoplodon bahamondi
Gray, 1874
Data deficient Unknown 150px 150px
1.2 tonnes
Blainville's Beaked Whale Mesoplodon densirostris
Blainville, 1817
Data deficient Unknown 150px 150px 150px
Gervais' Beaked Whale Mesoplodon europaeus
Gervais, 1855
Data deficient Unknown 150px 150px
1.2 tonnes
Ginkgo-toothed Beaked Whale Mesoplodon ginkgodens
Nishiwaki & Kamiya, 1958
Data deficient Unknown 150px 150px
1.5 tonnes
Gray's Beaked Whale Mesoplodon grayi
von Haast, 1876
Data deficient Unknown 150px 150px
1.5 tonnes
Hector's Beaked Whale Mesoplodon hectori
Gray, 1871
Data deficient Unknown 150px 150px
1 tonne
Hubbs' Beaked Whale Mesoplodon carlhubbsi
Sowerby, 1963
Data deficient Unknown 150px 150px
1.4 tonnes
Perrin's Beaked Whale Mesoplodon perrini
Dalebout, Mead, Baker, Baker, & van Helding, 2002
Data deficient Unknown 150px
1.3–1.5 tonnes
Pygmy Beaked Whale Mesoplodon peruvianus
Reyes, Mead, and Van Waerebeek, 1991
Data deficient Unknown 150px 150px
800 kilograms
Sowerby's Beaked Whale Mesoplodon bidens
Sowerby, 1804
Data deficient Unknown 150px 150px
1-1.3 tonnes
150px
Stejneger's Beaked Whale Mesoplodon stejnegeri
True, 1885
Data deficient Unknown 150px 150px
1.5 tonnes
Strap-toothed Whale Mesoplodon layardii
Gray, 1865
Data deficient Unknown 150px 150px
2 tonnes
True's Beaked Whale Mesoplodon mirus
True, 1913
Data deficient Unknown 150px 150px
1.4 tonnes
150px

Superfamily Platanistoidea: river dolphinsEdit

See also: Platanistoidea

River dolphins are five species of dolphin which reside in freshwater rivers and estuaries. They are classed in the Platanistoidea superfamily of cetaceans. Four species live in fresh water rivers. The fifth species, the La Plata Dolphin, lives in saltwater estuaries and the ocean. However it is scientifically classed in the river dolphin family rather than the oceanic dolphin family. All species have adaptations to facilitate fish catching: a long, forceps-like beak with numerous small teeth in both jaws, broad flippers to allow tight turns, small eyes, and unfused neck vertebrae to allow the head to move in relation to the body.

Family Iniidae: River DolphinsEdit

Main article: Iniidae

The Iniidae family of river dolphins contains only one genus and one species.

  • Amazon River DolphinI. geoffrensis
    • I. geoffrensis geoffrensis – Amazon basin population (excluding Madeira river drainage area, above the Teotonio Rapids in Bolivia)
    • I. geoffrensis humboldtiana – Orinoco basin population
    • Bolivian River DolphinI. boliviensis – Amazon basin population in the Madeira drainage area
colspan="100%" align="center" Template:Bgcolor-blue|Genus Inia – 1 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Boto (Amazon River Dolphin) Inia geoffrensis
Blainville, 1817
Vulnerable (VU) Unknown 150px 150px
150 kilograms
150px

Family Lipotidae: Baiji Edit

Main article: Lipotidae

The Lipotidae family is another monotypic taxon, containing only the Baiji. Fossil records suggest that the dolphin first appeared 25 million years ago and migrated from the Pacific Ocean to the Yangtze River 20 million years ago.[32] The species was declared functionally extinct in 2006 after an expedition to record population numbers.

colspan="100%" align="center" Template:Bgcolor-blue|Genus Lipotes – 1 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Baiji (Chinese River Dolphin) Lipotes vexillifer
Miller, 1918
Critically Endangered (CR) Possibly extinct 13[33] 150px 150px
130 kilograms
150px

Family Platanistidae: Ganges and Indus River Dolphin Edit

Main article: Platanistidae

The Platanistidae was originally thought to hold only one species (Ganges and Indus River Dolphin) but based on differences in skull structure, vertebrae and lipid composition scientists declared the two populations as separate species in the early 1970s.[34] In 1998 the results of these studies were questioned and the classification reverted to the pre-1970 consensus. Thus, at present, there are two subspecies recognized in the genus Platanista, Platanista gangetica minor (the Indus dolphin) and Platanista gangetica gangetica (the Ganges River dolphin).[35]

colspan="100%" align="center" Template:Bgcolor-blue|Genus Platanista – 1 species
Common nameScientific nameStatusPopulationDistributionSizePicture
Ganges and Indus River Dolphin Platanista gangetica
Roxburgh, 1801
Endangered (EN) 1,100[36] 150px 150px
200 kilograms
150px

Family Pontoporiidae: La Plata River Dolphin Edit

Main article: Pontoporiidae

The La Plata River Dolphin is the only species of the Pontoporiidae family and of the Pontoporia genus.

colspan="100%" align="center" Template:Bgcolor-blue|Genus Pontoporia – 1 species
Common nameScientific nameStatusPopulationDistributionSizePicture
La Plata Dolphin Pontoporia blainvillei
Gervais & d'Orbigny, 1844
Data deficient 4,000–4,500 150px 150px
50 kilograms
150px

See alsoEdit

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Notes and referencesEdit

  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Martin, Dr. Anthony R. (1991). Whales and Dolphins, London: Salamander Books.
  2. The total population is unknown but numbers in the hundreds of thousands.
  3. Total population unknown but thought to be locally common – it is the most common dolphin found around the Falkland Islands
  4. Estimates of various stocks throughout the North Atlantic give an overall value into the high tens or low hundreds of thousands.
  5. Varying population estimates for areas around California and the North Pacific give a total of up to 400,000
  6. Surveys suggest that this is the most common dolphin off of Chilean waters.
  7. The population around the continental shelf of the United States has been recorded to be in excess of 60,000. In the Pacific a census recorded 175,000 individuals in eastern tropical waters and 85,000 in the west. No global estimate of population exists.
  8. Estimates for eastern tropical Pacific are 45,000 and another recent survey estimates population to be 1,200 for the eastern Sulu Sea, no global estimate is known.
  9. The only population estimate is of 38,900 individuals in the eastern tropical Pacific Ocean
  10. The total population is unknown. The eastern Pacific was estimated to have in excess of 40,000 individuals and is probably the home of the largest grouping.
  11. Local estimates include 70–80,000 in the Antarctic, 8,000 in the tropical Pacific (although tropical waters are not the orca's preferred environment, the sheer size of this area — 19 million square kilometres — means there are thousands of orcas), up to 2,000 off Japan, 1,500 off the cooler northeast Pacific and 1,500 off Norway.
  12. Total population not known. There are estimated to be in excess of 200,000 in the Southern Ocean. The North Atlantic population is not known.
  13. Total population not known. There are 150,000 individuals in the eastern tropical Pacific Ocean. There are estimated to be more than 30,000 animals in the western Pacific, off the coast of Japan.
  14. Aerial surveys suggest a population of around 20,000 individuals. When submerged animals are also taken into account, the true figure may be in excess of 25,000.
  15. There are estimated to be 40,000 individuals in the Beaufort Sea, 25,000 in Hudson Bay, 18,000 in the Bering Sea and 28,000 in the Canadian High Arctic. The population in the St. Lawrence estuary is estimated to be around 1000.
  16. There are not enough data to place finless porpoises on the endangered species list, except in China, where they are endangered. Their propensity for staying close to shore places them in great danger from fishing
  17. There are no good estimates of the animals' abundance. However a comparison of two surveys, one from the late 1970s and the other from 1999/2000 shows a decline in population and distribution.
  18. Several surveys have been taken although large gaps of data is missing so an overall value cannot be achieved. In the Eastern Pacific Ocean: Central California 4,120; Northern California 9,250; Oregon and Washington 26,175. In the Atlantic Ocean: Gulf of Maine 67,500; Skagerrak and Belt Seas 36,046; North Sea 279,367; Ireland and western UK 36,280.
  19. Only few serious attempts have been made to estimate the total size of the vaquita population. Varying numbers have been obtained although an average of about 500 is usually found.
  20. Nothing is known of the abundance of this porpoise. It was the most commonly encountered species during preliminary beach surveys undertaken on Tierra del Fuego.
  21. There are no quantitative data on abundance.
  22. The most recent estimate for the North Pacific and Bering Sea is 1,186,000.
  23. The total number of Sperm Whales throughout the world is unknown. Crude estimates, obtained by surveying small areas and extrapolating the result to all the world's oceans, range from 200,000 to 2,000,000 individuals.
  24. 24.0 24.1 No global population estimates have been made. One survey estimated a population of about 11,000 in the eastern Pacific.
  25. Because of the difficulty of identifying the species the total global population is unknown.
  26. Arnoux's beaked whales seem to be relatively abundant in Cook Strait during summer
  27. Virtually nothing is known about the abundance of Baird's beaked whales, except that they are not rare as was formerly thought
  28. Nothing is known about the relative abundance of this species or its population composition.
  29. A 2002 survey estimates that there are 766 animals around Hawaii. No other population estimates exist for other locales.
  30. Total population is unknown but likely to be of the order of 10,000.
  31. There is thought to be a global population in excess of 500,000.
  32. Wang, Yongchen Farewell to the Baiji. China Dialogue. URL accessed on 2007-05-29.
  33. A survey from November–December 2006 failed to find any individuals. Another survey, from 1997, counted only 13 individuals. In 1986 surveys estimated the number to be at about 300.
  34. Pilleri, G., Marcuzzi, G. and Pilleri, O., 1982. Speciation in the Platanistoidea, systematic, zoogeographical and ecological observations on recent species. Investigations on Cetacea, 14: 15–46.
  35. Rice, DW (1998). Marine mammals of the world: Systematics and distribution, Society for Marine Mammalogy.
  36. Estimates give values of 1,100 Indus River Dolphins and maybe as few as 20 Ganges River Dolphins.
General references


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