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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 ...
Rainer Zangerl: Handbook of Paleoichthyology 3 A. Chondrichthyes I. Paleozoic Elasmobranchii. Gustav Fischer Verlag, New York 1981 (unveränderte Neuauflage Januar 2004) ISBN 3-89937-045-7 Rainer Zangerl and Gerard Ramon Case: Iniopterygia: a new order of Chondrichthyan fishes from the Pennsylvanian of North America.
Symmoriiformes were previously regarded as members of the elasmobranchii, making them distant relatives of living sharks and rays.Zangerl (1981), who erected the order, considered them to be elasmobranchs, [1] and this classification has been followed by some subsequent authors.
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.
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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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Sawfish have been found among archaeological remains in several parts of the world, including the Persian Gulf region, the Pacific coast of Panama, coastal Brazil and elsewhere. [4] [85] A mask with a sawfish rostrum from Sepik, Papua New Guinea, now housed at the Ethnological Museum of Berlin. The cultural significance of sawfish varies ...
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