Squalidae

Belongs within: Selachimorpha.Contains: Squalus. The Squalidae, spiny dogfishes, are a group of sharks characterised by the lack of anal fin, with the two dorsal fins often preceded by a fixed spine. The majority of species are found in deeper waters, with shallower-water species mostly found in colder regions. Just when you thought it was safe… Continue reading Squalidae

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Categorised as Acanthodii

Chimaeridae

Belongs within: Chimaeriformes. The Chimaeridae, shortnose chimaeras or ratfishes, are shark-like fishes with a large, blunt head and tapering bodies (Didier 2002a). Characters (from Didier 2002a): Medium-sized shark-like fishes with large head, blunt snout, and somewhat compressed, elongate bodies, tail tapering to an elongate filament. Colour pale to dark brown, darker dorsally, lighter or white… Continue reading Chimaeridae

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Categorised as Acanthodii

Raja

Belongs within: Rajiformes. Raja is a genus of skates in which the snout bears a well-defined, firm rostral cartilage (Last & Compagno 1999). <==Raja Linnaeus 1758H72 |–R. (Raja)H72 | |–*R. (R.) miraletus Linnaeus 1758H72 | |–R. (R.) clavata Linnaeus 1758H72 | |–R. (R.) herwigiH72 | |–R. (R.) maderensisH72 | |–R. (R.) pictaH72 | `–R. (R.)… Continue reading Raja

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Categorised as Acanthodii

Rajiformes

Belongs within: Chondrichthyes.Contains: Raja, Bathyraja, Dipturus, Leucoraja. The Rajiformes are fairly generalised rays with head, body and pectoral fins combined into a flat disc, and a slender tail bearing very small dorsal and caudal fins but lacking stinging spines (Bond 1996). Members include the Rajidae, skates, more than 200 species of generally diamond-shaped rays. Skates… Continue reading Rajiformes

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Categorised as Acanthodii

Chondrichthyes

Belongs within: Acanthodii.Contains: Eugeneodontiformes, Petalodontiformes, Selachimorpha, Pristidae, Rhinobatiformes, Rajiformes, Myliobatiformes, Torpediniformes, Subterbranchialia, Palaeoselachii, Ctenacanthiformes, Hybodontiformes. The Chondrichthyes, commonly known as the cartilaginous fishes in reference to their distinction from other living jawed vertebrates in retaining a primarily cartilaginous skeleton, include the sharks, rays and chimaeras. Members of this clade are united by the presence of… Continue reading Chondrichthyes

Lamniformes

Belongs within: Selachimorpha.Contains: Lamnidae. The Lamniformes, lamnoid sharks, are a group of sharks with the gill slits anterior to the origin of the pectoral fins, in which the distal fin radials extend to the margins of the fin web. Most are large and active sharks, often found in shallow waters (Bond 1996). The basking shark… Continue reading Lamniformes

Acanthodii

Belongs within: Gnathostomata.Contains: Gyracanthidae, Climatiidae, Chondrichthyes, Ischnacanthidae, Acanthodidae. Scleritomes: Not just an invert thing Published 23 January 2008 Most of the problematic fossil taxa known only from their sclerites fall into the class of organisms dismissed by the sadly vertebrate-centric as “creepy-crawlies”. Nevertheless, the disarticulated scleritome issue is not unique to invertebrates. The figure above… Continue reading Acanthodii