Species Diversity 22: 175–185 25 November 2017 DOI: 10.12782/sd.22_175 Rugosuscandona, a New Genus of Candonidae (Crustacea: Ostracoda) from Groundwater Habitats in Texas, North America Okan Külköylüoğlu1,6, Derya Akdemir2, Mehmet Yavuzatmaca1, Benjamin F. Schwartz3,4, and Benjamin T. Hutchins5 1 Department of Biology, Faculty of Arts and Science, Abant İzzet Baysal University, Bolu 14280, Turkey E-mail:
[email protected] 2 Merdivenköy Mahallesi, Şair Arşi Caddesi. No:16/14, Kadıköy, Istanbul 34732, Turkey 3 Edwards Aquifer Research and Data Center, Texas State University, San Marcos, Texas 78666, USA 4 Department of Biology, Texas State University, San Marcos, Texas 78666, USA 5 Texas Parks and Wildlife Department, 4200 Smith School Road, Austin, Texas 78744, USA 6 Corresponding author (Received 5 August 2016; Accepted 9 May 2017) http://zoobank.org/CD308AA8-CCA0-4831-B7CB-3052E946588F Rugosuscandona scharfi gen. nov. sp. nov. is described as a new genus of the family Candonidae from groundwaters of Texas, USA. The new genus differs from its congeners based on the presence of relatively long pore canals with sensory seta on the carapace surface, 6-segmented first antenna (A1), absence of bristles (t setae untransformed) and z setae on sec- ond antenna (A2), distinctly shaped male hemipenis and clasping organs, a simple claw-like uropod, and presence of 4+2 whorls on the Zenker’s organ. Additionally, reduction in the number of setae and segments of the other soft body parts can be used to differentiate between the new genus Rugosuscandona gen. nov. and its congeners. Therefore, the new genus is currently monotypic.