New Zealand Journal of Marine and Freshwater Research abstracts

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Larval shell development of the toheroa, Paphies ventricosa (Gray, 1843) (Mactracea: Mesodesmatidae)

P. REDFEARN

Fisheries Research Division Ministry of Agriculture and Fisheries P.O. Box 297 Wellington, New Zealand

Abstract The larval shells of Paphies ventricosa, reared to settlement in the hatchery, are similar in longitudinal profile to shells of some other mactracean larvae; the umbo-stage larval shells are nearly round with the anterior margin less broadly curved than the posterior margin, the anterior end is longer than the posterior end, and the umbo is broadly rounded. Straight-hinge larvae had total lengths up to 149 |xm, and total heights up to 126 H-m, and umbo larvae had total lengths up to 320 H.m, and total heights up to 282 |xm. The larvae settled in about 22 days at a size of about 270 u,m. The larval hinge structure bears some similarities to those of other mactracean larvae.

Keywords marine molluscs; spat; larvae; larval development; controlled conditions; developmental stages; rearing; larval settlement; morphology

New Zealand Journal of Marine and Freshwater Research, 1982, Vol. 16 : 241-252
Received 1 April 1982; accepted 27 July 1982

PDF file of entire paper: medium quality (1861K); (scanned from paper original: notes about this process)

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