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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 ...
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 ...
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.
The smooth lanternshark's slow rates of reproduction and growth may render it vulnerable to population collapse under sustained fishing pressure. [8] However, catch rates currently show no evidence of this occurring, which, coupled with the smooth lanternshark's wide geographic range, has led to the IUCN assessing it as of Least Concern . [ 1 ]
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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.
Nearly 40 percent of the nation’s juvenile delinquents are today committed to private facilities, according to the most recent federal data from 2011, up from about 33 percent twelve years earlier. Over the past two decades, more than 40,000 boys and girls in 16 states have gone through one of Slattery’s prisons, boot camps or detention ...