On Schornikovdona gen. nov. (Ostracoda, Candonidae) from rheocrene springs in Texas (U.S.A.)

Abstract

A new candonid genus,Schornikovdonagen. nov., with its type speciesSchornikovdona bellensissp. nov., is described from rheocrene springs of Bell County, Texas. It is designated to the tribe Candonini due to the smooth carapace surface, normal pore openings with sensory seta, the presence of a 5-segmented first antenna, two long sexual bristles on the second antenna in males, the narrowly fused terminal segment of the Md palp, a long penultimate segment of the Mxl palp, two long and one short setae on the terminal segment of T3, the absence of an “e” seta on T3, the presence of a posterior seta on the uropod, the presence of 5 + 2 rows of spines on Zenker’s organ, and other characteristics found in the tribe. The main diagnostic characteristics separating the new genus from the other genera in the tribe are the shape of the carapace, the reduced numbers of segments in the first antenna, reduction or absence of exopodial setae in the second antenna, asymmetrical clasping organs, the uropod with one rod-shaped claw, the different shape of the hemipenis, and differences in parts of the chaetotaxy. Based on these differences, we proposeSchornikovdonagen. nov. as a new genus, with the new speciesS. bellensissp. nov., in the subfamily Candoninae in the family Candonidae.

Stygobromus bakeri, a new species of groundwater amphipod (Amphipoda, Crangonyctidae) associated with the Trinity and Edwards aquifers of central Texas, USA

“…The visual search area within the underwater passage began at the shaft below the spring opening and up to a maximum penetration of 330 m. Hand sampling was performed using basters, fine aquarium dipnets, and centrifuge vials. Külköylüoğlu and Gibson (2018) and Külköylüoğlu et al (2017) described collection details at John Knox Springs, Comal County. Surveys using 250 µm drift nets at springs in the city of Salado, Bell County (Fig.…”

A new genus, Tuberocandona gen. nov. (Crustacea, Ostracoda, Candonidae) and past to present ostracod species diversity in Texas (USA)

“…The new genus along with its type species has different and unique soft body parts and chaetotaxy in the limbs. The tribe Cabralcandonini covers species with five (Schornikovdona bellensis) (Külköylüoğlu et al 2017d) to seven (e.g. Lacrimacandona wisei) ((Külköylüoğlu et al 2017a) segmented A1.…”

Ufocandona hannaleeae gen. et sp. nov. (Crustacea, Ostracoda) from an artesian well in Texas, USA

“…The largest subfamily is Candoninae, having about 511 species worldwide (Martens & Savatenalinton 2011). Prior to this study, Candoninae included about 45 genera (Külköylüoğlu et al 2011(Külköylüoğlu et al , 2017Martens & Savatenalinton 2011;Smith 2011;Danielopol et al 2012;Higuti & Martens 2012;Karanovic 2013). In terms of North American Candoninae (Karanovic 2006;Külköylüoğlu et al 2011, unpublished data), there are at least 42 species in eight genera (Candona Baird, 1845;Typhlocypris Vejdovský, 1882;Paracandona Hartwig, 1899;Candonopsis Vávra, 1891;Eucandona Daday, 1900;Nannocandona Ekman, 1914;Fabaeformiscandona Krstić, 1972;Bicornucandona Külköylüoğlu et al, 2011).…”