trochophore

(redirected from trachosphere)
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trochophore

(trŏk′ə-fôr′)
n.
The small, free-swimming, ciliated aquatic larva of various invertebrates, including certain mollusks and annelids.

trochophore

or

trachosphere

the characteristic larva of polychaet worms, molluscs and some other invertebrates. It is more or less spherical, with a pre-oral ring of cilia called the prototroch.