Web21 dec. 2024 · Cartilaginous fish, also called chondrichthyans, are characterized by having a cartilage skeleton. In addition, their skin is covered by placoid scales, which closely resemble a vertebrate tooth. That’s why these organisms have a rough texture to the touch. Their mouths contain numerous partially calcified teeth. WebChondrichthyan - Respiration, reproduction & growth Britannica Home Science Birds, Reptiles & Other Vertebrates Fish chondrichthyan Respiration Sharks breathe chiefly by opening the mouth while expanding the mouth-throat (bucco-pharyngeal) cavity and contracting the gill pouches to close the gill slits.
Phylogeny of the manta and devilrays (Chondrichthyes: …
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