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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 ...
Batomorphi is a clade of cartilaginous fishes, commonly known as rays, this taxon is also known as the superorder Batoidea, but the 5th edition of Fishes of the World classifies it as the division Batomorphi. [2]
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The Registry of Standard Biological Parts is a collection of genetic parts that are used in the assembly of systems and devices in synthetic biology. The registry was founded in 2003 at the Massachusetts Institute of Technology. The registry, as of 2018, contains over 20,000 parts.
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).
Edestus is an extinct genus of eugeneodontid holocephalian fish known from the Late Carboniferous (Pennsylvanian) of the United Kingdom, Russia, and the United States.Most remains consist of isolated curved blades or "whorls" that are studded with teeth, that in life were situated within the midline of the upper and lower jaws.
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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.