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Elasmobranchii is one of the two subclasses of cartilaginous fish in the class Chondrichthyes, the other being Holocephali . Members of the elasmobranchii subclass have no swim bladders, five to seven pairs of gill clefts opening individually to the exterior, rigid dorsal fins, and small placoid scales. The teeth are in several series; the ...
They and their close relatives, the sharks, compose the subclass Elasmobranchii. Rays are the largest group of cartilaginous fishes, with well over 600 species in 26 families. Rays are distinguished by their flattened bodies, enlarged pectoral fins that are fused to the head, and gill slits that are placed on their ventral surfaces.
Many had hypocercal tails in order to generate lift to increase ease of movement through the water for their armoured bodies, which were covered in dermal bone. They also had sucking mouth parts and some species may have lived in fresh water. The taxon contains the subgroups Heterostraci, Astraspida, Arandaspida. † Thelodonti (extinct)
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The clearnose skate (Rostroraja eglanteria) is a species of cartilaginous fish in the family Rajidae. R. eglanteria is also known by other common names such as the brier skate and summer skate. [3]
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The stingrays in the St. Johns River system represent the only permanent freshwater elasmobranch population in North America. [3] [9] [10] This species inhabits shallow coastal waters over sandy or silty bottoms, estuaries, and lakes. They prefer water temperatures over 15 °C (59 °F) and can tolerate temperatures over 30 °C (86 °F).
Specimen of "Hybodus" fraasi from the Late Jurassic of Germany, which some studies have included in Egertonodus Skeletal diagram of Hybodus sp.The largest hybodonts reached lengths of 2–3 metres (6.6–9.8 ft), [4] while some other hybodonts were much smaller, with adult body lengths of around 25 centimetres (0.82 ft). [5]