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    CONTRIBUTION TO THE OSTRACODA (CRUSTACEA) FAUNA OF THE KARSTIC REGION OF TEXAS WITH THE DESCRIPTION OF A NEW SPECIES
    (Natl Speleological Soc, 2023) Kulkoyluoglu, Okan; Tuncer, Alaettin
    A total of 27 ostracod taxa were collected from 1995 to 2017 from 61 aquatic bodies in the karstic region of Texas (USA) and 1 in Mexico, including from caves, springs, spring-fed pools, and springs/drips in karstic rock-shelters. Among these taxa, Dolerocypris reyesi sp. nov. is a new species collected from a shallow pool connected to the springs above a rock-shelter. Three species (Penthesilenula aotearoa, P. incae, and Vestalenula marmonieri) are reported for the first time from North America. In addition, Typhlocypris cf. prespica and 4 taxa (Microdarwinula zimmeri, Cypridopsis cf. herpestica, Pseudocandona cf. parallela, P. cf. pratensis) are new records of ostracod fauna of the US and Texas, respectively. The phylogenetic results based on 31 taxa and 30 morphological characters revealed 4 subgroups belonging to 6 main clustering groups within the family Darwinulidae. Including the new species reported here, the total number of non-marine ostracods in Texas is increased to 115 species. The results indicate that the total number of species is far below the true diversity and richness of the state.
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    Functional diversity and functional traits correlate ecology of nonmarine Ostracoda (Crustacea) at different elevational ranges
    (E Schweizerbartsche Verlagsbuchhandlung, 2024) Külköylüoğlu, Okan; Yavuzatmaca, Mehmet; Özdilek, Ahmet; Tuncer, Alaettin
    We tested how functional diversity (FD) along with its three components are correlated to ecological traits of nonmarine ostracods at seven elevational ranges from 800 to 1500 m. 38 ostracod taxa were collected from 55 aquatic sites in Aksaray province (Turkey). 21 species were new reports for the province. Shannon-Wiener diver-sity index indicated four cosmopolitans with more than 90 % of contribution. Results of the Canonical Correspond-ence Analysis (CCA) explained 76.8 % of the correlation between species and environmental variables. Salinity was the most effective variable on species. The highest functional divergence and functional richness were found in the elevational ranges of 800 - 899 m and 1100 -1199 m, respectively. When the highest functional evenness was accounted for the 1400 -1499 m, the functional dispersion was found higher in the range of 1200 -1299 m. A medium length of the carapace, the left valve overlaps the right valve, long swimming setae on the second antenna, a well-developed uropod, and a smooth carapace surface are the common traits of the species used in FD. Sampling sites were clustered by the common species, which also showed correlation with four cations (Ca, Na, Mg, K). Results suggest that 'functional diversity' can be used to correlate ostracod traits with their functional ecology.
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    New ostracod species (Cypridopsis schwartzi n. sp.) from Texas, with discussion on the taxonomic status of Cypridopsis species in the USA
    (Magnolia Press, 2022) Külköylüoğlu, Okan; Veech, Joseph A.; Tuncer, Alaettin
    A total of 39 taxa (19 living species, 20 subfossils) were collected from 59 different shallow aquatic bodies in Texas during April to June 2017. Cypridopsis schwartzi n. sp. is proposed as a new species collected from a cattle pond at Freeman Ranch near San Marcos, Texas. The species has several characteristics separating it from other species, including carapace shape, presence of a curved z3-seta on the second antenna, number of setae on the vibratory plate of the first thoracic leg, shape of hemipenis, numbers of whorls on the Zenker organ, and several other differences. With the new species, there are now 12 species in the genus Cypridopsis recorded for Texas, and Cypridopsis schwartzi n. sp. is the fifth species of the genus in Texas showing sexual reproduction. The new species was compared with other species of the genus in Texas and the taxonomic relationships are discussed.
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    Zoogeographical and stratigraphical distribution of the genus Zonocypris: Supportive evidence for Anatolian Diagonal and description of a new species from Turkey
    (Edp Sciences S A, 2021) Külköylüoğlu, Okan; Yavuzatmaca, Mehmet; Yılmaz, Ozan; Tunoğlu, Cemal; Akdemir, Derya; Nazik, Atike; Tuncer, Alaettin
    Since its first description from Madagaskar, there are about 16 living (Recent) species of the genus Zonocypris reported from Afrotropical, Neotropical and Palearctic regions. Similarly, there are about 16 fossil with two (sub)species of the genus known from the Early Cretaceous (e.g., India, France, Russia, China, Brazil) to Holocene (e.g., Albania). Among the species, the only species known with fossil and living species is Zonocypris costata. In Turkey, Zonocypris membranae with two subspecies (Z. m. membranae,Z. m. quadricella) is the only fossil species known while living individuals of Z. costata were encountered the southeast Anatolia. Additionally, Zonocypris mardinensis n. sp. is now proposed as a new species which shows clear differences in the soft body parts (e.g., aesthetasc ya in A1, knife-type G2 claw, shapes of clasping organs and hemipenis) and carapace structure (e.g., LV with extension, RV with posterior denticles). Overall, living species reported herein seem to inhabit comparatively warm (15-30 degrees C) within the ranges of slightly acidic to alkaline (pH 6.81-8.44) and low to well oxygenated waters (3.05-18.8 mg/l) where they can tolerate salinity (electrical conductivity 103-1910 mu S/cm) values within a limited elevational range (336-991 m). Our results suggest that geographic distribution of the living species of the genus is limited within southern parts of Turkey while fossil forms seem to exhibit much wider distribution in northern parts. Anatolian Diagonal as physical barrier may be considered to play a critical role on separating fossil (east-north regions) and extant (southeast region) species of the genus in Turkey. This is the first supportive evidence provided by the species of the genus Zonocypris that geographic barrier could have played the main role on its distribution.