LARVAL DEVELOPMENT OF BALANUS AMPHITRITE VAR. DENTICULATA BROCH REARED IN THE LABORATORY

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Abstract
The larvae of B. amphitrite var. denticulata have been reared in the laboratory from hatching to the settled stage. Nauplii were maintained in mass culture and under segregated conditions on Chlamydomonas sp. and fertilized Arbacia eggs. The appendage setation and spine structure are figured for each stage and the size compared with nauplii of B. eburneus. The duration of the 6 naupliar stages at 26[degree]C is as follows: 1st stage, 10 minutes to 6 hours; 2d stage, 1 day; 3d stage, 1 to 3 days; 4th stage, 1 to 2 days; 5th stage, 1 to 3 days; and the 6th stage, 1 to 5 days. The cyprid stage ranges from 1 to 8 days but successful settling and metamorphosis were observed only in those which settled 1 to 3 days after the final naupliar molt. Seven to 10 days are required for complete larval development. Successful settling was observed in 12.7% of the 126 nauplii studied under segregated conditions. A comparison of appendage setation with larvae of other varieties of B. amphitrite and other species and genera of barnacles indicates that setation formulae are not definitive in distinguishing all stages of all species. Setation is, however, a valuable criterion for identification of nauplii and may be used to separate certain stages and species.

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