Cobitis evreni, Erk'akan, Özeren & Nalbant, 2008

Freyhof, Jörg, Bayçelebi, Esra & Geiger, Matthias, 2018, Review of the genus Cobitis in the Middle East, with the description of eight new species (Teleostei: Cobitidae), Zootaxa 4535 (1), pp. 1-75 : 16-17

Cobitis evreni Erk'akan, Özeren & Nalbant, 2008

( Fig. 10 )

Cobitis evreni Erk'akan, Özeren & Nalbant, 2008a: 112, fig. 1 (type locality: Turkey: Kömür stream, Göksun, Kahramanmaraş, 38.014 36.508).

Material examined. HUIC uncat., 1, 78 mm SL; Turkey: Kahramanmaraş prov.: stream Kömür , 38.014 36.508.— FFR05530, 1, 75 mm SL ; Turkey: Kahramanmaraş prov.: stream Terbüzek about 2 km south of Göksun , 38.001 36.598 .

Material used in molecular genetic analysis. HUIC 299 TK-300TK; Turkey: Kahramanmaraş prov.: stream Göksun east of Göksun, at road to Yantepe , 38.024 36.515. (GenBank accession numbers: KJ 552911 , KJ 553207 ) .

Diagnosis. Cobitis evreni is distinguished from C. battalgilae and C. bilseli by the pigmentation in Z4 being fused into a dark-brown stripe reaching from above the pectoral-fin base until the anus or beyond (vs. blotches in Z4 usually vertically elongate or squarish, often dissociated into a band of small irregularly-shaped blotches and spots), lacking the pelvic axillary lobe (vs. often present, absent in some individuals), lacking the black spot at the uppermost caudal-fin base (vs. present) and having two laminae circularis in the male (vs. one in C. bilseli ). It is distinguished from C. elazigensis by Z4 formed by a dark-brown stripe reaching from above the pectoral-fin base until the anus or beyond (vs. Z4 organised by blotches), lacking the pelvic axillary lobe (vs. present) and lacking the black spot at the uppermost caudal-fin base and lacking the axillary pelvic lobe (vs. present).

Distribution. Cobitis evreni seems to have a very restricted range in the middle Ceyhan River drainage where it is found in the streams Göksun, Savrun and Hamus.

Remarks. Molecular data ( Fig. 1 ) place Cobitis evreni not into one of the species groups mentioned before. Molecular data presented by Perdices et al. (2018) place C. evreni into the C. linea species group, at a very basal position. See below for details to distinguish C. evreni from other species in the C. linea species group and from other Cobitis species found in the Asian Mediterranean Sea basin. Cobitis evreni has not been found in the lower Ceyhan, which is inhabited by C. aliyeae described below. Based on DNA barcoding Cobitis evreni is well separated from all other included Cobitis and by a minimum K2P distance of 7.0% to C. elazigensis , also supported as PTP and mPTP entity.

Figures

FIGURE 1. Maximum likelihood estimation of the phylogenetic relationships based on the mitochondrial COI barcode region (TN93 model, discrete Gamma distribution for rate differences with 3 categories +G parameter = 0.3792. Nucleotide positions with less than 95% site coverage were eliminated, resulting in 590 analysed positions. Numbers of major nodes indicate bootstrap values from 1000 pseudoreplicates from the ML, NJ and MP method. A star denotes highest possible support from all three methods. Solid bars right to the specimen labels indicate species delimitation results from PTP followed by the results of the mPTP approach as dashed bars. Except to the outgroups and the branch to the right part of the figure, the tree is drawn to scale with branch lengths depicting number of substitutions per site.

FIGURE 10. Cobitis evreni, HUIC uncat., paratype, 78 mm SL; Turkey: stream Kömür; FFR05530, 75 mm SL; Turkey: stream Terbüzek.