Dictionary of Ichthyology  

labyrinth organ = a much folded suprabranchial accessory breathing organ found in Anabantoidei. Formed by vascularized expansion of the epibranchial of the first gill arch. Used for respiration in air. Also called accessory breathing organ.

Anabas scandens (= A. testudineus) the climbing perch, from " A Guide to the Study of Fishes" by D. S. Jordan, 1905. Photograph by Brian W. Coad.

Canadian Museum of Nature