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Spiracle of a bluespotted ribbontail ray, Taeniura lymma. Spiracles (/ ˈ s p ɪr ə k əl, ˈ s p aɪ-/ [1] [2]) are openings on the surface of some animals, which usually lead to respiratory systems. Spiracle of a shark (bighead spurdog, Squalus bucephalus) The spiracle is a small hole behind each eye that opens to the mouth in some fish.
Shark Anatomy (50693674756) The gill slits of a whale shark flaring as it expels water from its pharyngeal cavity. In the shark anatomy image, it depicts the beginning half of the shark, including the gills. The shark gills are especially important and were evolved from the chordate pharyngeal gill slits synapomorphy.
Shark gill slits lie in a row behind the head. The anterior edge of a gill slit is motile, moving outward to allow water to exit, but closing to prevent reverse flow. A modified slit, called a spiracle , lies just behind the eye , which assists the shark with taking in water during respiration and plays a major role in bottom–dwelling sharks.
The shortnose demon catshark (Apristurus internatus) is a shark of the family Pentanchidae, the deepwater catsharks. This species is found only in deep water in the East China Sea . Its length is up to 40 cm. [ 2 ] A. internatus is known only from the holotype (a 49.1-cm-total length female) and a paratype (a 40.3-cm male), both caught in the ...
Spiracles are reduced or missing in active pelagic sharks. [28] While the shark is moving, water passes through the mouth and over the gills in a process known as "ram ventilation". While at rest, most sharks pump water over their gills to ensure a constant supply of oxygenated water.
The Pacific spiny dogfish also has a special feature called a spiracle. These are gills that are behind the eyes of the shark that give oxygen to the eyes and brain. It is also used to breathe while resting or eating. [20] The breathing of the dogfish happens as a two step process.
Apristurus internatus S. M. Deng, G. Q. Xiong & H. X. Zhan, 1988 (shortnose demon catshark) Apristurus investigatoris Misra, 1962 (broadnose catshark) Apristurus japonicus Nakaya, 1975 (Japanese catshark) Apristurus kampae L. R. Taylor, 1972 (longnose catshark) Apristurus laurussonii Sæmundsson, 1922 (Iceland catshark)
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. The first of the three species ...