Abstract
In 1912-13, Stebbing erected the genera Holostylis and Ekdiastylis for those diastylids with the endopod of the uropods being one- and two-segmented, respectively. The validity of the genus Holostylis is still controversial and the genus Ekdiastylis continues to be suppressed. In the present contribution, two new diastylids are fully described and illustrated: one of them has the endopod of the uropod one-segmented, Holostylis uniramosa n. sp., and the other has the endopod of the uropod two-segmented, Diastylis decalineata n. sp. The genus Holostylis has currently three nominal species, which are easily distinguished from each other by the number of thoracic appendages with fully developed exopods in females: three in H. helleri (Zimmer, 1908), one in H. spinicuadata Błażewicz-Paszkowycz and Heard, 2005, and none in H. uniramosa n. sp. The validity of genus Holostylis is confirmed and its diagnosis emended. Diastylis decalineata n. sp. mainly distinguished from the other species of Diastylis with two-segmented uropod endopods by the shape and sculpture of its carapace.
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Acknowledgments
We thank the crew of the R/V Puerto Deseado for their assistance in the collection of the material during the surveys Mejillón II, COPLA II, TALUD CONTINENTAL 2012, and CAV 2013. We also thank Fabián Tricárico (MACN) for the SEM photographs, and Karen Osborn and Rafael Lemaitre (NMNH, Smithsonian Institution) for the digital images of the holotype of Holostylis spinicauda they kindly sent to us. We are also grateful to the three anonymous reviewers for their valuable comments and suggestions. This research was supported by the Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina (PIP 11220090100244) and the Universidad de Buenos Aires (UBACyT 20020100100857).
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Roccatagliata, D., Alberico, N.A. Two new cumaceans (Crustacea: Peracarida) from the South-West Atlantic with remarks on the problematic genus Holostylis Stebbing, 1912. Mar Biodiv 46, 163–181 (2016). https://doi.org/10.1007/s12526-015-0349-1
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DOI: https://doi.org/10.1007/s12526-015-0349-1