Spiracle (vertebrates)
Videos
Spiracles are openings on the surface of some animals, which usually lead to respiratory systems.
Spiracle of a bluespotted ribbontail ray, Taeniura lymma
Spiracle of a shark (bighead spurdog, Squalus bucephalus)
Gnathostomata
Videos
Gnathostomata are jawed vertebrates. Gnathostome diversity comprises roughly 60,000 species, which accounts for 99% of all extant vertebrates, including all living bony fishes and cartilaginous fishes
Dunkleosteus terrelli skull , Royal Tyrrell Museum, Drumheller, Alberta, 2025 07 13
Wikilemon Nbrevirostris 1 Terry Goss
Pygocentrus nattereri Karlsruhe Zoo 01
Nile crocodile head