\Der`o*tre"ma*ta\, n. pl. [NL., fr. Gr. ? skin + ?,
?, hole.] (Zo["o]l.)
The tribe of aquatic Amphibia which includes Amphiuma,
Menopoma, etc. They have permanent gill openings, but no
external gills; -- called also {Cryptobranchiata}. [Written
also {Derotrema}.]