Common bivalve larvae from New Zealand: Mytilacea

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Abstract
The late stage larvae of five common mytilid bivalves (Mollusca: Pelecypoda: Mytilacea) are described and provisionally identified as Mytilus edulis aoteanus, Modiolus areolatus, Perna canaliculus, Xenostrobus pulex , and Modiolarca impacta . All are readily distinguishable on the basis of larval shell features, including hinge structure. However, one common species, Aulacomya maoriana , was not discerned, and thus the identifications must remain tentative. The larvae were recovered from plankton samples from Bay of Islands (35° 15’ S, 174° 10’ E), Wellington Harbour (41° 16’ S, 174° 51’ E), and Raumati Beach (40° 56’ S, 174° 58’ E), New Zealand, during 1970–72. Their seasonal occurrences in the plankton are described and related to the condition index of the adults as far as possible.

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