PhD thesis, Biology.
The spiny dogfish (Squalus acanthias), also known as the spurdog and piked dogfish, is a bottom-dwelling shark of the family Squalidae. It is a small shark, typically growing to lengths of - meters, and is distinguished by its slender build, greyish-brown colour (countershaded with white ventrally), dorsal white spots, heterocercal tail, lack of anal fin and characteristically, its . Summary The external and internal structure of the spines of Squalus acanthias are described. Internally the spines consist of a series of dentine cones laid down one within the other. This series is reflected in the external structure by bands of pigment associated with ridges of by: Elasmobranchii (sharks and rays) > Squaliformes (Bramble, sleeper and dogfish sharks) > Squalidae (Dogfish sharks) Etymology: Squalus: Genus name from Latin 'squalus' meaning shark (Ref. , ); acanthias: Genus name from the Latin 'squalus' meaning shark; species name from the Greek 'akanthias' referring to the spines (Ref. , ).More on author: Linnaeus. The spiny dogfish gets its name from the two large ungrooved spines on each dorsal fin, which have venom glands at their base and are used primarily for defence. In spite of the spines and venom glands, the spiny dogfish do have a few enemies, including larger sharks, some large predatory fish species, seals and killer whales.
Book review; Biology and management of dogfish sharks Article (PDF Available) in The Quarterly Review of Biology 85(4) January with 19 Reads How we measure 'reads'. Squalus is a genus of dogfish sharks in the family Squalidae. Commonly known as spurdogs, these sharks are characterized by smooth dorsal fin spines, teeth in upper and lower jaws similar in size, caudal peduncle with lateral keels; upper precaudal pit usually present, and caudal fin without subterminal : Chondrichthyes. Chondrichthyes, Family: Squaliforms and Species: Squalus acanthias. Spiny dogfish can be found in the western Atlantic from Argentina up to Greenland, and spanning the eastern Atlantic from Iceland to northern Russia down to South Africa, including the Black and Mediterranean Size: KB. The spiny dogfish, spurdog, mud shark, or piked dogfish (Squalus acanthias) is one of the best known species of the Squalidae (dogfish) family of sharks, which is part of the Squaliformes order. While these common names may apply to several species, Squalus acanthias is distinguished by having two spines (one anterior to each dorsal fin) and lacks an anal : Chondrichthyes.
The structure of the spine of the spur dogfish (Squalus acanthias L.) and its use for age determination. Journal of the Marine Biological Association of the United Kingdom, 42 (2): – DOI: /S Part Clarification of the status of Squalus tasmaniensis and a diagnosis of Squalus acanthias from Australia, including a key to the Indo-Australasian species of Squalus: Journal/Book Name, Vol. No.: Descriptions of New Dogfishes of the Genus Squalus (Squaloidea: Squalidae) CSIRO Marine and Atmospheric Research Paper No. Page(s): Biological classification: Species. The Spiny Dogfish, Squalus acanthias,is a small shark found in temperate waters worldwide, where it is or has been important in commercial fisheries. It is exceptionally slow-growing and long-lived and therefore especially prone to rapid over-exploitation and long-lasting depletion. Dissection of the Spiny Dogfish Shark – Squalus acanthias Biology – Penn State New Kensington (D. Sillman - adapted from ‘Laboratory Studies in Integrated Zoology’ by Hickman and Hickman) Classification Phylum Chordata, Subphylum Vertebrata, Class Chondrichthyes (cartilagenous fishes)File Size: KB.