В формировании чешуи основную роль играет внутренний слой кожи — дерма. Хрящевые рыбы имеют плакоидную чешую, которая гомологична зубам всех позвоночных; перемещаясь в ходе эволюции на челюсти, плакоидные чешуи, собственно, и превращаются в зубы у акул и скатов. Плакоидная чешуя состоит из дентина, который формирует основу чешуй, а сверху покрыта эмалью.
Первый луч спинного плавника у некоторых глубоководных рыб-хищников может быть превращён в своеобразное удилище — илиций, служащее для приманивания потенциальных жертв. Различают парные и непарные плавники.
You can find eight living species of lobe-finned fish: six species of lungfish and two coelacanths. Lobe-finned fish have fleshy fins that venture from the human body on stalks.
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is placed on a variety of vertebrates of many evolutionary strains. It describes a existence-type in lieu of a taxonomic group. As associates of your phylum Chordata, fish share specified options with other vertebrates. These attributes are gill slits sooner or later while in the everyday living cycle, a notochord, or skeletal supporting rod, a dorsal hollow nerve cord, as well as a beginner reptile setup tail.
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Electric powered rays will be able to deliver An electrical cost, that is utilised both to capture prey reptile care guide and as self-protection against predators. The demand produced by some species is enough to knock a person off his toes, but will not be lethal.