Source : Webster's Revised Unabridged Dictionary (1913)

Derotremata \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}.]