protaspis larva
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holaspis larva — (ARTHROPODA: Trilobita) Final larval stage in which the general adult structures are present and with succeeding molts minor changes and increase of size; see protaspis and meraspis larva … Dictionary of invertebrate zoology
Walter Garstang — (February 9, 1868 February 23, 1949), a Fellow of Lincoln College, Oxford, was a marine biologist and zoologist who was one of the first to study the functional biology of marine invertebrate larvae. His best known works on marine larvae were his … Wikipedia