The Collaborative International Dictionary of English v.0.48:

Taeniosomi \Tae`ni*o*so"mi\, n. pl. [NL., fr. Gr. taini`a ribbon
   + sw^ma body.] (Zool.)
   An order of fishes remarkable for their long and compressed
   form. The ribbon fishes are examples. See Ribbon fish,
   under Ribbon.
   [1913 Webster]