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Squalidae, more commonly known as dogfish, dog sharks, or spiny dogfish, [3] are one of several families of sharks categorized under Squaliformes, making it the second largest order of sharks, numbering 119 species across 7 families. [4]
Thelodonti ('feeble-teeth') are a group of small, extinct jawless fishes with distinctive scales instead of large plates of armour. There is much debate over whether the group of Palaeozoic fish known as the Thelodonti (formerly coelolepids [ 11 ] ) represent a monophyletic grouping , or disparate stem groups to the major lines of jawless and ...
This shark is known to hunt in packs that can range up into the thousands. They are aggressive hunters and have a sizable diet that can range from squid, fish, crab, jellyfish, sea cucumber, shrimp and other invertebrates. [8] Dogfish sharks experience one of the longest gestation periods of any organism, which can last from around 18 to 24 months.
Superficially, acanthoracids resembled scaly chimaeras or small, scaly arthrodires with blunt rostrums. They were distinguished from chimaeras by a pair of large spines that emanate from their chests, the presence of large scales and plates, tooth-like beak plates, and the typical bone-enhanced placoderm eyeball.
The Pacific spiny dogfish (Squalus suckleyi) is a common species of the Squalidae (dogfish) family of sharks and are among the most abundant species of sharks in the world. . This species is closely related to the Spiny dogfish and for many years they were treated as a single species.
Armor-like scales coated with ganoin found in gars and bichirs. genital papilla A small, fleshy tube behind the anus in some fishes, from which the sperm or eggs are released; the sex of a fish often can be determined by the shape of its papilla. gill arches The bony arches to which the gills are attached. gill cover
Dogfish sharks (Squalidae), a family of sharks . Spiny dogfish (Squalus acanthias), best known species of dogfish sharks; Pacific spiny dogfish (Squalus suckleyi), the most abundant species of dogfish sharks
Common names of fish can refer to a single species; to an entire group of species, such as a genus or family; or to multiple unrelated species or groups. Ambiguous common names are accompanied by their possible meanings. Scientific names for individual species and higher taxa are included in parentheses.