noun, plural bi·pin·nar·i·ae [bahy-pi-nair-ee-ee] /ˌbaɪ pɪˈnɛər iˌi/, bi·pin·nar·i·as.
Examples from the Web for bipinnaria
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.
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.