bipinnaria

[ bahy-pi-nair-ee-uh ]

/ ˌbaɪ pɪˈnɛər i ə /

the free-swimming, bilaterally symmetrical larva of certain starfishes.

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From New Latin; see origin at bi-¹, pinna, -aria

Bipinnaria or Branchiolaria: The larval stage of starfishes.
The Sea-beach at Ebb-tide|Augusta Foote Arnold
The egg becomes a sort of infusoria, the infusoria becomes a bipinnaria, and this produces the Asterias.
The Ocean World:|Louis Figuier
Ontologically, however, the two bands of Bipinnaria do not appear to arise from the division of a single band.
The Works of Francis Maitland Balfour, Volume II (of 4)|Francis Maitland Balfour
Thus the larv of the starfishes were called Bipinnaria, the larv of the sea-urchins Pluteus, and so on.
Elementary Zoology, Second Edition|Vernon L. Kellogg

The presence of two rings instead of one distinguishes the Bipinnaria from the Auricularia.
The Works of Francis Maitland Balfour, Volume II (of 4)|Francis Maitland Balfour