Fish fin
Videos
Fins are moving appendages protruding from the body of fish that interact with water to generate thrust and lift, which help the fish swim. Apart from the tail or caudal fin, fish fins have no direct
Skeleton of a lingcod, a ray-finned fish
Lobe-finned fishes, like this coelacanth, have fins that are borne on a fleshy, lobe-like, scaly stalk extending from the body. Due to the high number of fins it possesses, the coelacanth has high manoeuvrability and can orient its body in almost any direction in the water.
Pectoral fin with fleshy lobe of Latimeria chalumnae (Citron / CC-BY-SA-3.0)
Skeleton of the pectoral girdle and fin of the extant coelacanth Latimeria chalumnae (Citron / CC-BY-SA-3.0)
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