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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.
Seagrass beds are important reproductive habitat for yellow stingrays Like other stingrays, the yellow stingray is aplacental viviparous : at first the embryos are sustained by yolk , which is later supplanted by histotroph ("uterine milk", rich in proteins and lipids ), delivered by the mother through numerous finger-like extensions of the ...
The largest species, called simply the nurse shark Ginglymostoma cirratum, may reach a length of 4.3 m (14 ft); the tawny nurse shark Nebrius ferrugineus is somewhat smaller at 3.2 m (10 ft), and the short-tail nurse shark Pseudoginglymostoma brevicaudatum is by far the smallest at just 75 cm (2.46 ft) in length.
Elasmobranchii is a subclass that includes the sharks and the rays and skates. Members of the elasmobranchii 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 upper jaw is not fused to the cranium, and the lower jaw is ...
Pages in category "Elasmobranchii" The following 15 pages are in this category, out of 15 total. This list may not reflect recent changes. ...
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Relatively little is known about the reproductive habits of the sawfish, but all species are ovoviviparous with the adult females giving birth to live young once a year or every second year. [2] In general, males appear to reach sexual maturity at a slightly younger age and smaller size than females. [ 2 ]