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Illustration of barbels on the head of a fish. The head or skull includes the skull roof (a set of bones covering the brain, eyes and nostrils), the snout (from the eye to the forward-most point of the upper jaw), the operculum or gill cover (absent in sharks and jawless fish), and the cheek, which extends from the eye to the preopercle. The ...
A fish can have up to three dorsal fins. The dorsal fins serve to protect the fish against rolling, and assist it in sudden turns and stops. In anglerfish, the anterior of the dorsal fin is modified into an illicium and esca, a biological equivalent to a fishing rod and lure; The bones that support the dorsal fin are called pterygiophores.
The snakeheads are members of the freshwater perciform fish family Channidae, native to parts of Africa and Asia. These elongated, predatory fish are distinguished by their long dorsal fins, large mouths, and shiny teeth. They breathe air with gills, which allows them to migrate short distances over land.
Sarcopterygii (/ ˌ s ɑːr k ɒ p t ə ˈ r ɪ dʒ i. aɪ /; from Ancient Greek σάρξ (sárx) 'flesh' and πτέρυξ (ptérux) 'wing, fin') — sometimes considered synonymous with Crossopterygii (from Ancient Greek κροσσός (krossós) 'fringe') — is a clade (traditionally a class or subclass) of vertebrate animals which includes a group of bony fish commonly referred to as lobe ...
Pelvic fins or ventral fins are paired fins located on the ventral (belly) surface of fish, and are the lower of the only two sets of paired fins (the other being the laterally positioned pectoral fins). The pelvic fins are homologous to the hindlimbs of tetrapods, [1] which evolved from lobe-finned fish during the Middle Devonian.
English: Comparison between the fins of A., Crossopterygiin fishes and the legs of B., tetrapods. Bones which correspond to each other have the same color. Bones which correspond to each other have the same color.
The lower 3 rays of the pectoral fins are enlarged and free of the fin membrane. They have two separate dorsal fins, the first having between 7 and 11 spines while the second has 10 to 23 soft rays. The anal fin may not have any spines or it can have a single spine and 11 to 23 soft rays. The head is bony and resemble a casque.
The pectoral fins developed into forelegs (arms in the case of humans) and the pelvic fins developed into hind legs. [50] Much of the genetic machinery that builds a walking limb in a tetrapod is already present in the swimming fin of a fish. [51] [52] Comparison between A) the swimming fin of a lobe-finned fish and B) the walking leg of a ...