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DEVELOPMENT AND MORPHOLOGY OF LABORATORY-REARED LARVAE OF DISSODACTYLUS NITIDUS SMITH, 1840 (DECAPODA: BRACHYURA), WITH A DISCUSSION OF PHYLOGENETIC ASPECTS IN THE PINNOTHERIDAE

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ABSTRACT Dissodactylusnitidus is a small pinnotherid crab living as an ectosymbiont on the Pacific sand dollars Encope grandis, E. californica, E. micropora, and Mellita longifissa. Larvae of D. nitidus are the first to be described among over 30 pinnotherid species ranging from the Gulf of California to Peru. It is the only known species of Dissodactylus to develop four zoeal stages before metamorphosis to the megalopa. All larval stages are described in detail, including the distribution of chromatophores and types of setae. Beginning with the first zoea, mean duration for each stage was 4.5, 2.6, 3.1, and 3.7 days, with the first megalopae appearing 11 days after hatching. The zoeae of D. nitidus are similar to those of other members of the "large-palped" or major subgroup (D. crinitichelis, D. primitivus, D. mellitae) and are unlike members of the "small-palped" or minor subgroup (D. stebbingi, D. rugatus). Larvae of all species can be separated based on morphometric measurements. The megalopa bears a unique oversize seta on the fifth leg which readily distinguishes it from the corresponding stage of all other species of Dissodactylus.

10.1163/193724089X00098
/content/journals/10.1163/193724089x00098
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/content/journals/10.1163/193724089x00098
2017-08-23

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