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(C) - Homocercal where the fin usually appears superficially symmetric but in fact the vertebrae extend for a very short distance into the upper lobe of the fin. Homocercal caudal fins can, however, also appear asymmetric (e.g. blue flying fish). Most modern fishes have a homocercal tail. These come in a variety of shapes, and can appear:
The material of Leighiscus is too fragmentary to determine the affinities to any specific group of fish within palaeonisciformes. However, the more homocercal tail and the morphology of the haemal elements are stated to be comparable to what is seen in Ainia. [3]
Most fish have a homocercal tail, but it can be expressed in a variety of shapes. The tail fin can be rounded at the end, truncated (almost vertical edge, as in salmon), forked (ending in two prongs), emarginate (with a slight inward curve), or continuous (dorsal, caudal, and anal fins attached, as in eels).
The bowfin has a rounded heterocercal tail that resembles a homocercal tail. This type of tail gives the body a streamlined shape which allows the bowfin to improve its swimming ability by reducing drag. These types of tails are common in fish with gas bladders, because the bladder supplies the fish with natural buoyancy. [34]
Mountain whitefish possess a forked homocercal tail. The short head has a small mouth underneath the snout . The short dorsal fin has 12–13 rays, with 11–13 for the anal fin , 10–12 for the pelvic fins , and 14–18 for the pectoral fins .
It possesses a pair of pectoral fins, pelvic fins in the ventral and abdominal positions, which all are white, yellow, or silver. No adipose fin can be found after the dorsal fin on its back. The caudal fin or tail fin is notched and homocercal. This means that the tail has two lobes that are symmetrical.
Their outer covering consists of small bony-ridged, cycloid scales (40–43 of these scales run along the lateral line) and a forked homocercal tail. Gravel Chubs are soft ray-finned fish and have no adipose fin. The pectoral fins are pointed made up of approximately 13–16 rays and located relatively low on the body, typical of primitive species.
It is a slender, elongated fish which has a small mouth with long extensions of both jaws forming a beak with the extension of the lower jaw being slightly longer than that of the upper jaw, the dorsal and anal fins are set far back on the body and have short bases, each is followed by 5-7 finlets between them and the deeply forked homocercal tail.