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The black endostyle is visible below the oral siphon, as well as a mid-dorsal black line below the atrial siphon. [ 11 ] Clavelina ossipandae is also recognizable by the black markings on its white anterior portion (a central dot between the oral and atrial siphons, surrounded by two lateral bands), uniquely distinctive in the genus Clavelina .
The endoskeleton of the fish is made up of two main components: the axial skeleton consisting of the skull and vertebral column, and the appendicular skeleton supporting the fins. [7] The fins are made up of bony fin rays and, except for the caudal fin, have no direct connection with the spine.
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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 than ...
There was a loss of opercular and extrascapular elements, enhancing head mobility in T. roseae compared to other tetrapodomorph fish. [1] The formation of the neck allowed for locomotion in shallow waters. This environment allows for less motility compared to the three-dimensional space that fish are able to orient themselves in.
[7] [8] It has three vertical white stripes outlined with a fine black line. The first passes just behind the eye, the second in the middle of the body widens forward to the head centrally and the third one circles the caudal peduncle . [ 4 ]
tuna – Species of fish; Forage fish – Small prey fish anchovy – Family of fishes; herring – Forage fish, mostly belonging to the family Clupeidae; sardine – Common name for various small, oily forage fish; Demersal fish – Fish that live and feed on or near the bottom of seas or lakes cod – Common name for the demersal fish genus Gadus
Squaloraja was most closely related to modern chimaeras, but appeared completely unlike any living chimaera.Individuals of Squaloraja had flattened, ray-like bodies with enormous, flattened rostra that comprised half of the body length & were lined with limited denticles, giving them a superficial resemblance to a sawfish with a very wide, ovate "saw".