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In cetaceans, the tail gained two fins at the end, called a fluke. [91] Fish tails are usually vertical and move from side to side. Cetacean flukes are horizontal and move up and down, because cetacean spines bend the same way as in other mammals. [92] [93] Similar adaptations for fully aquatic lifestyle are found both in dolphins and ichthyosaurs.
Caudal/Tail fins: Also called the tail fins, caudal fins are attached to the end of the caudal peduncle and used for propulsion. The caudal peduncle is the narrow part of the fish's body. The hypural joint is the joint between the caudal fin and the last of the vertebrae. The hypural is often fan-shaped.
They share membership in this clade with lungfish and tetrapods. Externally, several characteristics distinguish coelacanths from other lobe-finned fish. They possess a three-lobed caudal fin, also called a trilobate fin or a diphycercal tail. A secondary tail extending past the primary tail separates the upper and lower halves of the coelacanth.
The forelimbs became flippers and, in pinnipeds, the hind limbs became a tail terminating in two fins (the cetacean fluke, conversely, is an entirely new organ). [62] Fish tails are usually vertical and move from side to side. Cetacean flukes are horizontal and move up and down, because cetacean spines bend the same way as in other mammals. [63 ...
Fins located on the median line of the fish; the dorsal, anal and caudal fins. mediolateral Between the middle and the sides. melanophore A cell (chromatophore) containing melanin or other black pigment. mesocoracoid A bone of the pectoral arch or shoulder girdle. mesopelagic Refers to the region of the open ocean between 200 m and 1000 m in depth.
The tail fin may range in shape from truncated to forked. Most species are fairly low-key in colour, commonly shades of yellow, brown, and gray. [ 12 ] Notable exceptions include three small, vibrant Hoplolatilus species: the purple sand tilefish ( H. purpureus ), Starck's tilefish ( H. starcki ), and the redback sand tilefish ( H. marcosi ).
The ranchū tail meets the caudal peduncle at a 45-degree angle, giving the fish a unique swimming motion. The tail lobes are rounded, and all other fins are paired. [3] Compared to lionheads, ranchū have a particularly down-turned tail and tail fin. [2] Ranchū have arched backs and much shorter tails, which are tucked in at a 45-degree angle ...
The Tosakin (土佐金) or curly fantail goldfish is a distinctive breed of goldfish with a large tail fin that spreads out horizontally (like a fan) behind the fish. Though technically a divided tail, the two halves are attached at the center, forming a single fin. It was developed in Japan, and is rarely seen in other countries. [1]