'Thecosomata' definitions:
Definition of 'Thecosomata'
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Thecosomata \The`co*so"ma*ta\, n. pl. [NL. See Theca, and
Soma.] (Zool.)
An order of Pteropoda comprising those species which have a
shell. See Pteropoda. -- {The`co*so"ma*tous}, a.
[1913 Webster]
