Morphology and Classification of Decapod Crustacean Larval Setae: A Scanning Electron Microscope Study of Dissodactylus Crinitichelis Moreira, 1901 (Brachyura: Pinnotheridae)
Setae of the three zoeae, megalopa and first crab instar of Dissodactylus crinitichelis are described in detail from laboratory reared specimens. Scanning electron microscopy showed that setae are morphologically more complex and diverse than previously thought. More than thirty distinct setal types were observed. Of these, fifteen are plumodenticulate, equipped with distal denticules and proximal setules. An attempt has been made to accommodate this diversity within a unified system of classification by combining two previously existing schemes, which required some minor modifications. The proposed criteria for classification include such shaft characteristics as length/width ratio, location and conspicuousness of annulus, shape of tip, presence (or absence) and position of pore as well as the distribution and type of setules and denticules. On a basis of morphology some functions of setae can be inferred. It is suggested that complex setae, such as some plumodenticulate types, might perform multiple functions. Other cuticular structures are described and illustrated, including two cuticular organ complexes of unknown function, found in all examined stages.
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Document Type: Research Article
Publication date: July 1, 1981
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