Dictionary of Ichthyology  

physostome = a species having the gas bladder connected by a tube to the gut.

From Kingsley's "Textbook of Vertebrate Zoology, 1906. A = most teleosts, B = Erythrinus, C= Polypterus, Calamoichthys and dipnoans. Photograph by Brian W. Coad.

Canadian Museum of Nature
www.briancoad.com