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    Embryonic and larval development of Spisula solidissima similis (Say, 1822) (Bivalvia: Mactridae)

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    Author
    Walker, R.L.
    O'Beirn, F.X.
    Keyword
    Spisula solidissima similis
    Date
    1996
    Publisher
    California Malacozoological Society
    
    Metadata
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    Abstract
    Larvae of the southern surf clam, Spisula solidissima similis (Say, 1822), were reared in the laboratory at a salinity of 25 ppt and a temperature of 20-22°C through the embryonic and early larval development period. Unfertilized eggs averaged 58.5 ± 0.32 (SE) μm, with the size-frequency of eggs being normal. First polar body was observed 22 minutes after fertilization with 50% of eggs exhibiting polar bodies after 26 minutes. Ciliated blastula and trochophore stages occurred at 6 hours and 16.8 hours, respectively. Straight-hinge veligers appeared 39.2 hours after fertilization. Larvae grew to a mean size of 172 μmin the pediveliger phase (range 119 to 212 μm). Larvae were exhibiting active foot-probing by day 8 and continued to do so until day 13 when the cultures suffered heavy mortalities. Early life-history traits of Spisula solidissima similis larvae are compared to those for Spisula solidissima solidissima and Spisula sachalinensis.
    URI
    http://hdl.handle.net/10793/1221
    Description
    Peer-reviewed.
    Citation
    Walker, R.L. and O'Beirn, F.X. (1996) Embryonic and larval development of Spisula solidissima similis (Say, 1822) (Bivalvia: Mactridae). The Veliger, 39(1), pp. 60-64
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