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Abstract
Argentinean specimens of Cletocamptus of the collection of the Smithsonian Institution as well as recently collected material were analyzed and four new species are described. Cletocamptus assimilis sp. nov. and C. tertius sp. nov. seem to be related to C. levis. Cletocamptus pilosus sp. nov. seems to be related to C. stimpsoni. Cletocamptus spinulosus sp. nov. shares the armature formula of the mandibular palp, the armature formula of P1–P4 and the lower insertion level of the innermost seta of the male P5BENP with C. levis, C. assimilis sp. nov. and C. tertius sp. nov. Cletocamptus spinulosus sp. nov. shares the slender seta of the maxillulary arthrite with C. pilosus sp. nov. and C. stimpsoni, and is unique in the strong spinules along the posterior margin of the P2- to P4-bearing somites. Additional comments on some other species and an identification key to the species of Cletocamptus are presented.
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Acknowledgements
The first author is indebted to Mr T. Chad Walter and Dr Frank Ferrari (National Museum of Natural History [Smithsonian Institution]) for the loan and permission to dissect part of the material deposited in the collection of the Smithsonian Institution, and to William Keel for the catalogue numbers for the material deposited in the collection of the National Museum of Natural History (Smithsonian Institution). The material provided by Dr Richard M. Warwick, of the Plymouth Marine Laboratory, was collected while on a Royal Society travel grant to study the meiofauna of Argentinian inland saline lakes in collaboration with Dr Catalina T. Pastor de Ward of the Centro Nacional Patagónico (CONICET), Puerto Madryn, Chubut, Argentina. We are grateful to Dr Ray Gerber (Saint Joseph's College, USA) for providing us with material from the US Virgin Islands.