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Actinopterygii

Actinopterygii  

; class Osteichthyes)A subclass of ray-finned fish, that includes the majority of living bony fish of sea and fresh water. The fins are composed of a membranous web of skin supported by a varying ...
cartilage bone

cartilage bone  

Bone that is formed by replacing the cartilage of an embryo skeleton. The process, called endochondral ossification, is brought about by the cells (osteoblasts) that secrete bone. Compare membrane ...
cartilaginous fish

cartilaginous fish  

Fish in which the skeleton, including the skull and jaws, consists entirely of cartilage and never, even in the adult stage, comprises bony tissue. Sharks and rays (Chondrichthyes) have a ...
Craniata

Craniata  

(kingdom Metazoa, phylum Chordata)The subphylum that comprises animals that have a bony or cartilaginous skull and a dorsal vertebral column. See also Vertebrata.http://www.tolweb.org/Craniata ...
fin ray

fin ray  

A rod-like support of the fin membrane, composed of cartilage in lampreys, horny fibres in sharks, and bone in bony fish.
membrane bone

membrane bone  

A bone that develops in connective tissue by direct ossification, without cartilage being formed first. The bones of the face and skull are membrane bones.
osteoid

osteoid  

A soft material, consisting mainly of collagen, that is secreted by osteoblasts and constitutes the uncalcified matrix of bone. Osteoid is converted into hard bone matrix when it combines with ...
Pteraspidomorphi

Pteraspidomorphi  

(superclass Agnatha)A class of jawless vertebrates that have an eel-like body, lack paired fins, have two semicircular canals, and a skeleton not consisting of true bone. The class includes the ...

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