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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 ...
[5] [6] After the appearance of jawed fish (placoderms, acanthodians, sharks, etc.) about 420 million years ago, most ostracoderm species underwent a decline, and the last ostracoderms became extinct at the end of the Devonian period. More recent research indicates that fish with jaws had far less to do with the extinction of the ostracoderms ...
Synechodontiformes (1 C, 2 P) X. Xenacanths (10 P) Pages in category "Elasmobranchii" The following 15 pages are in this category, out of 15 total.
They can certainly all reach about 6 m (20 ft) in total length and there are reports of individuals larger than 7 m (23 ft), but these are often labeled with some uncertainty. [1] Typically reported maximum total lengths of these three are from 7 to 7.6 m (23–25 ft). [ 1 ]
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]
Like many bony fishes, but unlike its sister group, the Elasmobranchii, the upper jaw of the chimaera is fused with the skull. [5] [6] Although their jaws are soft and mouths are relatively small, they have the largest biting force and jaw leverage found within the Holocephali, which supports their ability to consume large prey. One of their ...
An American Airlines flight departing New York's LaGuardia Airport on Thursday evening had to divert to nearby John F. Kennedy International shortly after takeoff after a reported bird strike ...
The common eagle ray reaches up to 183 cm (6.0 ft) in total length [3] and has a disc width up to 80 cm (2.6 ft). [4] Most specimens are, however, smaller. [5] Females grow to be larger than males. [6] The dorsal surface is brown or black while the ventral surface is white.