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Encyclopedia > Dwarf Sperm Whale
Dwarf Sperm Whale
Conservation status: Lower risk
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Subclass: Eutheria
Order: Cetacea
Suborder: Odontoceti
Family: Kogiidae
Genus: Kogia
Species: K. sima
Binomial name
Kogia sima
Owen, 1866

Dwarf Sperm Whale range

The Dwarf Sperm Whale (Kogia sima) is one of three species of whale in the sperm whale family. They are not often sighted at sea and most of our understanding of the creatures comes from the study of washed-up specimens. Scientific classification or biological classification is how biologists group and categorize extinct and living species of organisms. ... Phyla Porifera (sponges) Ctenophora (comb jellies) Cnidaria Placozoa Bilateria  Acoelomorpha  Orthonectida  Rhombozoa  Myxozoa  Superphylum Deuterostomia     Chordata (vertebrates, 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 Monotremata Monotremata Subclass Marsupialia Didelphimorphia Paucituberculata Microbiotheria Dasyuromorphia Peramelemorphia Notoryctemorphia Diprotodontia Subclass Placentalia Xenarthra Dermoptera Desmostylia Scandentia Primates Rodentia Lagomorpha Insectivora Chiroptera Pholidota Carnivora Perissodactyla Artiodactyla Cetacea Afrosoricida Macroscelidea Tubulidentata Hyracoidea Proboscidea Sirenia The mammals are the class of vertebrate animals primarily characterized by the presence of mammary... Eutheria is a classification system nearly synonymous with Placentalia. ... Suborders Mysticeti Odontoceti (see text) The order Cetacea includes whales, dolphins and porpoises. ... Families See text The toothed whales (systematic name Odontoceti) form a suborder of the cetaceans. ... Genera Kogia Physeter The sperm whale family or simply the sperm whales is the collective name given to three species of whale, the Sperm Whale, the Pygmy Sperm Whale and the Dwarf Sperm Whale. ... Genera Kogia Physeter The sperm whale family or simply the sperm whales is the collective name given to three species of whale, the Sperm Whale, the Pygmy Sperm Whale and the Dwarf Sperm Whale. ... In biology, binomial nomenclature is a standard convention used for naming species. ... Sir Richard Owen and Dinornis bird skeleton Sir Richard Owen (July 20, 1804 - December 18, 1892) was an English biologist, comparative anatomist and palaeontologist. ... 1866 is a common year starting on Monday. ... Download high resolution version (1357x628, 34 KB) , User:Pcb21 after User:Vardion. ... In biology, a species is a kind of organism. ... Whales are the largest species of exclusively aquatic placental mammals, members of the order Cetacea, which also includes dolphins and porpoises. ... Genera Kogia Physeter The sperm whale family or simply the sperm whales is the collective name given to three species of whale, the Sperm Whale, the Pygmy Sperm Whale and the Dwarf Sperm Whale. ...

Contents

Taxonomy

Nowadays the Dwarf Sperm Whale is generally classified as one of two species, along with the Pygmy Sperm Whale, in the Kogiidae family and Kogia genus, however it was not until 1966 that the two species were regard as separate and even more recently Kogiidae was regarded as a subfamily (Kogiinae) of Physeteridae. Binomial name Kogia breviceps Blainville, 1838 Pymgy Sperm Whale range The Pygmy Sperm Whale (Kogia breviceps) is one of three species of whale in the sperm whale family. ... Genera Kogia Physeter The sperm whale family or simply the sperm whales is the collective name given to three species of whale, the Sperm Whale, the Pygmy Sperm Whale and the Dwarf Sperm Whale. ... Genera Kogia Physeter The sperm whale family or simply the sperm whales is the collective name given to three species of whale, the Sperm Whale, the Pygmy Sperm Whale and the Dwarf Sperm Whale. ... Genera Kogia Physeter The sperm whale family or simply the sperm whales is the collective name given to three species of whale, the Sperm Whale, the Pygmy Sperm Whale and the Dwarf Sperm Whale. ...


Physical description

The Dwarf Sperm Whale is the smallest of all whales. It grows up to 2.7 m in length and 250 kg in weight – making it smaller than the bigger dolphins. The species makes slow, deliberate movements with little splash or blow and will usually lie motionless when at the sea's surface. Consequently it can only be observed in very calm seas. Genera See article below. ...


The Dwarf Sperm Whale is physically very similar to and has the same behavioural characteristics as its cousin the Pygmy Sperm Whale. Identification may be close to impossible at sea – however the Dwarf is slightly smaller and has a considerably larger dorsal fin. The body is mainly bluish grey with a lighter underside with slightly yellow vein-like streaks possibly visible. There is a white false gill behind each eye. The flippers are very short and broad. The top of the snout overhangs the lower jaw which is small. Dwarves have long, curved and sharp teeth (0–6 in the upper jaw, between 14 and 26 in the upper). These teeth have led the species to be described as the "rat porpoise" in the Lower Antilles. Dorsal Fin of the Orca A dorsal fin is a fin located on the backs of fishes, whales, dolphins and porpoises. ... Species 50 species; see text *Several subfamilies of Muroids include animals called rats. ... Genera Neophocaena Phocoena - Harbor porpoises Phocoenoides - Dalls porpoises The porpoises are small cetaceans of the family Phocoenidae; they are related to whales and dolphins. ...


Like the other Sperm Whales the Dwarf Sperm Whale has a spermaceti organ in its forehead. Like the Pygmy Sperm, the Dwarf is able to expel a dark reddish substance when frightened or attack – possibly to put off any predators. Binomial name Physeter macrocephalus Linnaeus, 1758 Sperm Whale range The Sperm Whale (Physeter macrocephalus) is the largest of the toothed whales and is the largest toothed animal in the world. ...


Dwarf Sperm Whales are usually solitary creatures but have occasionally been seen in small groups. They feed mainly on squid and crab. Suborders Myopsina Oegopsina Squids are the large, diverse group of marine mollusks, popular as food in cuisines as widely separated as the Japanese and the Italian. ... Sections Dromiacea Raninoida Heterotremata Thoracotremata The term crab is sometimes applied to several different groups of short (nose to tail) decapods with thick exoskeletons, but only members of the Brachyura are true crabs; other taxa, such as hermit crabs, porcelain crabs, king crabs, and horseshoe crabs are, despite superficial similarities...


Population and distribution

The Dwarf Sperm Whale prefers deep water but is still more coastal than the Pygmy Sperm. Its favourite habitat appears to be just off the continental shelf. In the Atlantic, strandings have been observed in Virginia, United States in the west and Spain in the east, and as far south as southern Brazil and the tip of Africa. In the Indian Ocean, specimens have been found on the south coast of Australia and on many places along the Indian Ocean's northern coast - from South Africa right round to Indonesia. In the Pacific the known range includes the Japanese coast and British Columbia. No global population estimates have been made. One survey estimated a population of about 11,000 in the eastern Pacific. The continental shelf is the extended perimeter of each continent, which is covered during interglacial periods such as the one we live in by relatively shallow seas and gulfs. ... State nickname: Old Dominion Other U.S. States Capital Richmond Largest city Virginia Beach Governor Mark R. Warner Official languages English Area 110,862 km² (35th)  - Land 102,642 km²  - Water 8,220 km² (7. ... Africa is the worlds second-largest continent in both area and population, after Asia. ... Motto: Splendor Sine Occasu (Splendour without diminishment) Other Canadian provinces and territories Capital Victoria Largest city Vancouver Lieutenant Governor Iona Campagnolo Premier Gordon Campbell (BC Liberal) Area 944,735 km² (5th)  - Land 925,186 km²  - Water 19,549 km² (2. ...


Human interaction

The Dwarf Sperm Whale has been actively hunted by commercial whalers. Occasion harpoon kills are made by Indonesian and Japanese fishermen. As the Dwarf Sperm Whale is more coastal than the Pygmy it may be more vulnerable to human interference such as fishing and pollution. No data exists at this time as to whether such activities are threatening the long-term survival of the species.


References

  1. Pygmy and Dwarf Sperm Whales by Donald F. McAlpine in Encyclopedia of Marine Mammals pp. 1007-1009 ISBN 01255513402
  2. Whales Dolphins and Porpoises, Mark Carwardine, Dorling Kindersley Handbooks, ISBN 0751327816
  3. National Audubon Society Guide to Marine Mammals of the World, Reeves, Stewart, Clapham and Powell, ISBN 0375411410

  Results from FactBites:
 
Sperm Whale - MSN Encarta (690 words)
Sperm whales probably split off from the ancestors of all present-day cetaceans about 20 million years ago, and they may be as closely related to the baleen whales as they are to other toothed whales and dolphins.
The bodies of sperm whales are laterally compressed, with a single blowhole on the left front of the head and a thick dorsal hump originating at the hindmost third of the body.
Sperm whales were hunted intensively by American whalers during the 1800s for the light oil of their heads, and by factory ships of several countries in the 1900s for their meat.
Dwarf Sperm Whale - Wikipedia, the free encyclopedia (598 words)
Nowadays the Dwarf Sperm Whale is generally classified as one of two species, along with the Pygmy Sperm Whale, in the Kogiidae family and Kogia genus, however it was not until 1966 that the two species were regarded as separate, and even more recently Kogiidae was regarded as a subfamily (Kogiinae) of Physeteridae.
The Dwarf Sperm Whale is the smallest of all whales.
Dwarfs have long, curved and sharp teeth (0–6 in the upper jaw, between 14 and 26 in the lower).
  More results at FactBites »

 
 

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