protostracum

protostracum
n. [Gr. protos, first; ostrakion, a shell]
(MOLLUSCA: Bivalvia)
1. In larval forms, the first formed part of a prodissoconch.
2. In oysters, the shell of the D-shaped larval stage; straight-hinge veliger.

Online Dictionary of Invertebrate Zoology. . 2005.

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Look at other dictionaries:

  • D-shaped larval stage — (MOLLUSCA) A larva in the form of a D, the back of which is the long, straight hinge; protostracum …   Dictionary of invertebrate zoology

  • straight-hinge veliger — see protostracum …   Dictionary of invertebrate zoology

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