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The Dusky Dolphin (Lagenorhynchus obscurus) is a highly gregarious and acrobatic dolphin found in coastal waters in the Southern Hemisphere. It was first identified by John Gray in 1828. It is very closely genetically related to the Pacific White-sided Dolphin, although current scientific consenus is that they are distinct species. The conservation status of a species is an indicator of the likelihood of that species continuing to survive. ...
Download high resolution version (1054x585, 55 KB) Dusky Dolphins Photographed by Mirko Thiessen (Baldhur) off Kaikoura, New Zealand, February 1992 File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ...
Scientific classification or biological classification is how biologists group and categorize extinct and living species of organisms. ...
Phyla Porifera (sponges) Ctenophora (comb jellies) Cnidaria (coral, jellyfish, anenomes) Placozoa (trichoplax) Subregnum Bilateria (bilateral symmetry) Acoelomorpha (basal) Orthonectida (flatworms, echinoderms, etc. ...
Typical Classes Subphylum Urochordata - Tunicates Ascidiacea Thaliacea Larvacea Subphylum Cephalochordata - Lancelets Subphylum Myxini - Hagfishes Subphylum Vertebrata - Vertebrates Petromyzontida - Lampreys Placodermi (extinct) Chondrichthyes - Cartilaginous fishes Acanthodii (extinct) Actinopterygii - Ray-finned fishes Actinistia - Coelacanths Dipnoi - Lungfishes Amphibia - Amphibians Reptilia - Reptiles Aves - Birds Mammalia - Mammals Chordates (phylum Chordata) include the vertebrates, together with...
Orders Subclass Multituberculata (extinct) Plagiaulacida Cimolodonta Subclass Palaeoryctoides (extinct) Subclass Triconodonta (extinct) Subclass Eutheria (includes extinct ancestors)/Placentalia (excludes extinct ancestors) Afrosoricida Artiodactyla Carnivora Cetacea Chiroptera Cimolesta (extinct) Creodonta (extinct) Condylarthra (extinct) Dermoptera Desmostylia (extinct) Embrithopoda (extinct) Hyracoidea Insectivora Lagomorpha Litopterna (extinct) Macroscelidea Mesonychia (extinct) Notoungulata (extinct) Perissodactyla Pholidota Plesiadapiformes...
Eutheria is a taxon (specifically, an infraclass) nearly synonymous with Placentalia, containing the placental mammals and the nearest ancestors of placental mammals (which are known only from the fossil record). ...
Suborders Mysticeti Odontoceti (see text for families) The order Cetacea includes whales, dolphins and porpoises. ...
Families See text The toothed whales (systematic name Odontoceti) form a suborder of the cetaceans. ...
Genera See text Oceanic dolphins are the members of the Delphinidae family of cetaceans. ...
Species Lagenorhynchus albirostris Lagenorhynchus acutus Lagenorhynchus obliquidens Lagenorhynchus obscurus Lagenorhynchus australis Lagenorhynchus cruciger Lagenorhynchus is a genus in the order cetacea containing six closely related species. ...
In biology, binomial nomenclature is the formal method of naming species. ...
John Edward Gray. ...
Image File history File links Download high resolution version (1357x628, 34 KB) , User:Pcb21 after User:Vardion. ...
Genera See article below. ...
Southern Hemisphere The Southern Hemisphere is the half of a planets surface (or celestial sphere) that is south of the equator (the word hemisphere literally means half ball). On Earth it contains four continents (part of Africa, Oceania, most of South America, and Antarctica) and four oceans (South Atlantic...
John Edward Gray (February 12, 1800 - March 7, 1875) was a British zoologist. ...
1828 was a leap year starting on Tuesday (see link for calendar). ...
Genetics (from the Greek genno γεννώ= give birth) is the science of genes, heredity, and the variation of organisms. ...
Binomial name Lagenorhynchus obliquidens (Gill, 1865) Pacific White-sided Dolphin range The Pacific White-sided Dolphin (Lagenorynchus obliquidens) is a very active dolphin found in the cool to temperate waters of the North Pacific Ocean. ...
Physical description
The Dusky Dolphin is short-to-medium in length in comparison with other species in the family. There is significant variation in size in the different population areas. The largest Duskys have been encountered off Peru, where the are up to 210cm in length and 100kg in weight. The back of the dolphin is dark grey and dorsal fin is distinctively two-toned - the leading edge matches the back in colour but the trailing edge is a much lighter grey-y white. Duskys have a long light grey patch on their foreside leading to a dark grey short beak. The throat and belly are white. There are two blazes of white colour running back on the body from the dorsal fin to the tail. Dusky Dolphins may easily be confused with Peale's Dolphins when observed at sea. Dorsal Fin of the Orca A dorsal fin is a fin located on the backs of fishes, whales, dolphins and porpoises. ...
Binomial name Lagenorhynchus australis (Peale, 1848) Peales Dolphin range The Peales Dolphin (Lagenorynchus australis) is a small dolphin found in the waters around Tierra del Fuego at the foot of South America. ...
Population and distribution The population of Dusky Dolphins is unknown but authorities do not fear for the survival of the species at the moment. The Dusky Dolphin is distributed in coastal waters of Chile, Argentina and the Falkland Islands, Namibia and the west coast of South Africa and the east coast of New Zealand. There may also be resident populations off Tasmania and New South Wales and several small islands in the South Atlantic and Indian Oceans. An ariel survey over Patagonia in the mid-1990s indicated that there was a local population in excess of 7,000 individuals. Duskys can move over great distances (one individual had a confirmed range of 780kn). However it is not believed that they follow a migatory pattern. Motto: Ubertas et Fidelitas (Fertility and Faithfulness) Nickname: The Apple Isle Other Australian states and territories Capital Hobart Government Governor Premier Const. ...
Motto: Orta Recens Quam Pura Nites (Newly Risen, How Brightly You Shine) Nickname: First State, Premier State Other Australian states and territories Capital Sydney Government Governor Premier Const. ...
For other uses, see Atlantic (disambiguation) The Atlantic Ocean is Earths second-largest ocean, covering approximately one-fifth of its surface. ...
A bit of history Before the arrival of the Spaniards, several indigenous groups populated the region. ...
The 1990s decade refers to the years from 1990 to 1999, inclusive, the last decade of the 20th Century. ...
Conservation and dolphin-watching Outside Peruvian coastal waters, the main danger to Dusky Dolphins from humans is the accidental catching of individuals by fishing trawls. In the mid-1980s around 400-600 animals were killed annually off Patagonia due to individuals becoming trapped in nets. Rates appear to have declined since then due to tighter regulations on the fishing industry. However in Peruvian waters in addition to accidental catches there is continuing deliberate catching via nets and harpoons. The number of animals killed each year in this area runs into the thousands and a conservationists' cause for concern. 1980 (MCMLXXX) was a leap year starting on Tuesday. ...
On account of their highly acrobatic displays and movements in large pods, Dusky Dolphins are firm favourites with dolphin-watching enthusiasts. Several boat operators from Kaikoura, on New Zealand South Island are either dedicated to watching Duskys or watch them in combination with tours aimed at watching Sperm Whales. Whale watching off the coast of Bar Harbor, Maine. ...
A view of the bay in Kaikoura showing the mountains. ...
[[{{{diversity_link}}}|Diversity]] {{{diversity}}} Binomial name Physeter macrocephalus Linnaeus, 1758 Trinomial name {{{trinomial}}} Type Species {{{type_species}}} {{{subdivision_ranks}}} Sperm Whale range (in blue) Synonyms {{{synonyms}}} The Sperm Whale (Physeter macrocephalus) is the largest of the toothed whales and is believed to be (with the possible exception of some sauropod dinosaurs) the largest...
References - National Audubon Society: Guide to Marine Mammals of the World ISBN 0375411410
- Encyclopedia of Marine Mammals ISBN 0125513402
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