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Free Content Larval and Postlarval Development of the Corrugated Jewel Box Clam Chama Congregata Conrad (Bivalvia: Chamidae)

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The larvae of Chama congregata Conrad, a sessile, dimyarian tropical bivalve, were reared and described to facilitate their identification in plankton and bottom samples.

The dimensions (in microns) were determined (L = length; H = height; D = depth).

Straight hinge stage: L = 76-139; H = 62-128; D = 43-87; L − 15 = H ± 6; L − 50 = D ± 12. Straight hinge-line = 56-66.

Umbo stage: L = 112-214; H = 95-203; D = 66-152. L − 3 = H ± 19. L − 52 = D ± 14. Umbo broadly rounded with ends bluntly pointed.

Pediveligers: Length 177-214. Height subequal to or greater than length. Two teeth appear in right valve during late umbo stage. The ligament is external.

Larvae first attach by byssus at a length of 200μ but are not permanently cemented until about 350μ long. Juveniles have adult shell characteristics at a length of 500μ.

Document Type: Research Article

Publication date: September 1, 1971

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