Oxynoemacheilus kaynaki

Freyhof, Jörg, Kaya, Cüneyt, Turan, Davut & Geiger, Matthias, 2019, Review of the Oxynoemacheilus tigris group with the description of two new species from the Euphrates drainage (Teleostei: Nemacheilidae), Zootaxa 4612 (1), pp. 29-57: 39-42

publication ID

https://doi.org/10.11646/zootaxa.4612.1.2

publication LSID

lsid:zoobank.org:pub:FE1913E9-E308-4807-A706-1D0F7A7C674B

persistent identifier

http://treatment.plazi.org/id/7E5087BF-6D78-FFA1-7FF6-FF77FCB783C4

treatment provided by

Plazi

scientific name

Oxynoemacheilus kaynaki
status

 

Oxynoemacheilus kaynaki   Erk‘akan, Özeren & Nalbant, 2008

( Fig. 7–9 View FIGURE 7 View FIGURE 8 View FIGURE 9 )

Oxynoemacheilus kaynaki   Erk‘akan, Özeren & Nalbant, 2008:115, figs. 1–3 (type locality: Turkey: Göksu River, Nurhak, Elbi- stan, Firat basin, 37°53‘22.82‘‘N 37°22‘19.99‘‘E).

Material examined. FFR 1447, 7, 60–64 mm SL; FFR 15519 View Materials , 15, 46–65 mm SL; Turkey: Malatya prov.: stream Sultan Suyu, about 8 km east of Akçadağ, 38.339 38.062.— FFR 1466, 13, 31–61 mm SL; Turkey: Sivas prov.: stream Kangal, about 2 km east of Çetinkaya , 39.253 37.626 GoogleMaps   .— FFR 1483, 3, 31–42 mm SL; Turkey: Sivas prov.: stream Kangal, about 4 km east of Çetinkaya , 39.278 37.653 GoogleMaps   .— FFR 15509 View Materials , 14, 52–68 mm SL; Turkey: Adıyaman prov.: stream Göksu at Düzbağ , 37.795 37.471 GoogleMaps   .— FFR 15528 View Materials , 20, 35–63 mm SL; Turkey: Muş prov.: stream Kay- narca at Tepe , 39.107 41.492.— FSJF 1989, 11 GoogleMaps   , 31–48 mm SL; Turkey: Elazığ prov.: stream Gül at Karakocan, at road from Elazığ to Bingöl, 38.9660 40.0271.— FSJF 2937, 2 GoogleMaps   , 67–68 mm SL; Turkey: stream Sürgü between Hamzalar and Kapıdere , 37.9536 37.6952.— FSJF 2911, 26 GoogleMaps   , 29–64 mm SL; Turkey: Sivas prov.: stream Kangal under railway bridge at Çetinkaya 39.2516 37.6189. IUSHM 2019-1412, 2 GoogleMaps   , 52–54 mm SL; Turkey: stream Tatlı at Kabakçevliği, 25 km east of Kangal , 39.3013 37.6743 GoogleMaps   .

Material used in molecular genetic analysis. FFR DNA- 297–299, 318, 319, 322, 323, 326, 327; Turkey: Adıyaman prov.:stream Göksu at Düzbağ , 37.705 37.479.(GenBank accession numbers: MK 546494 View Materials - MK 546496 View Materials ). — FFR DNA-265–267 GoogleMaps   ; Turkey: Malatya prov.: stream Sultan Suyu, about 8 km east of Akçadağ , 38.339 38.062. (GenBank accession numbers: MK 546490 View Materials - MK 546492 View Materials ).—FFR DNA-262, 275 GoogleMaps   ; Turkey: Turkey: Sivas prov.: stream Kangal under railway bridge at Çetinkaya 39.2516 37.6189. (GenBank accession numbers: MK546489, MK546493).—FFR DNA-335–336 GoogleMaps   ; Turkey: Muş prov.: stream Kaynarca at Tepe , 39.107 41.492. (GenBank ac- cession numbers: MK 546503 View Materials - MK 546504 View Materials )— FSJF DNA-1389 GoogleMaps   ; Turkey: Sivas prov.: stream Kangal under railway bridge at Çetinkaya 39.2516 37.6189. (GenBank accession numbers: MK 546473 View Materials - MK 546474 View Materials ).— FSJF DNA- 1473 GoogleMaps   ; Turkey: stream Sürgü between Hamzalar and Kapıdere, 37.9536 37.6952. (GenBank accession numbers: MK 546461 View Materials - MK 546462 View Materials ).— FSJF DNA-2401 GoogleMaps   ; Turkey: stream Tatlı at Kabakçevliği, 25 km east of Kangal , 39.3013 37.6743. (GenBank accession number: MK 546475 View Materials ) GoogleMaps   .

Additional distribution records. GBIF: 39.2516 37.6189, 37.9536 37.6952.

Diagnosis. Oxynoemacheilus kaynaki   is distinguished from O. ercisianus   and O. hazarensis   by having a complete lateral line (vs. incomplete), a shallow, wide and long dorsal adipose ridge on the caudal peduncle not elevated from the dorsal profile on caudal peduncle, reaching to the middle of the caudal peduncle or below the last dorsalfin ray when folded down (vs. no dorsal-adipose crest or ridge in individuals smaller than 50 mm SL, if present, short, reaching forward to vertical through base of last anal-fin ray, but usually much shorter, elevated from dorsal profile), no suborbital groove in the male (vs. present in O. hazarensis   ), the flank covered by scales (vs. absent in O. ercisianus   , scales present on caudal peduncle in O. hazarensis   ), and a bold, dark-brown or black bar at the caudal-fin base (vs. a mottled pattern).

Distribution. Oxynoemacheilus kaynaki   was described from the upper Göksu River drainage and it is here re- ported from the stream Kaynarca and the stream Gül, which is a headwater of the Peri Suyu, the Sultan Suyu, which flows to the Karakaya reservoir and the Kangal stream, which flows to the Keban reservoir.

Remarks. Our molecular data ( Fig. 1 View FIGURE 1 ) place O. kaynaki   in the O. tigris   species group.

Oxynoemacheilus kaynaki   is widespread in the upper Euphrates drainage ( Fig. 2 View FIGURE 2 ). Our data strongly suggest that there are many more or less isolated populations of O. kaynaki   which also show little molecular and morphological differences. The intraspecific variability in O. kaynaki   ranges from 0.5% K2P distance between the populations from the Kaynarca (Murat) and the Göksu River to 1.0% K2P distance between the Kangal and Sultan Suyu drainages.

Oxynoemacheilus kaynaki   from the Kangal and Sultan Suyu are distinguished from those of the Göksu and Murat by having a shorter dorsal adipose ridge, reaching forward to the vertical through the base of the last anal-fin ray, but usually much shorter (vs. very long not elevated from the dorsal profile, reaching below the last dorsal-fin ray when folded down), 8–11 small brownish blotches on the back (vs. 5–8 large blackish blotches or saddles), and a deeper caudal peduncle (13–15% SL vs. 10–13). However, the grouping in fishes with a long or a short dorsal adipose ridge is not supported by molecular character and would make the two groups paraphyletic. Furthermore, we expect also more morphologically intermediate fishes, when more populations will be examined in the future. Therefore, all these populations are identified as O. kaynaki   .

Erk‘akan et al. (2008) described O. kaynaki   as having a convex or truncate caudal fin. They show a very poor quality photograph of the holotype, in which the upper and lower part of the caudal fin seems to be broken. In our material, there are several individuals which have an almost truncate caudal fin, but no individual has a convex caudal fin.

Oxynoemacheilus kaynaki   is distinguished from O. araxensis   , O. argyrogramma   , O. bergianus   , O. euphraticus   , and O. samanticus   by having no suborbital groove in the male (vs. present), a slightly emarginate or almost truncate caudal fin (vs. deeply emarginate or slightly forked), and no black spots at the caudal-fin base (vs. having two bold black spots in O. argyrogramma   and O. euphraticus   ).

Oxynoemacheilus kaynaki   is distinguished from O. paucilepis   by having a long dorsal adipose ridge on the caudal peduncle (vs. no ridge or crest), the flank with a mottled or marmorate brown pattern, with irregularly shaped brown bars, especially on the flank behind the dorsal-fin origin in some individuals (vs. flank with a distinct midlateral series of roundish or horizontally elongated large brown blotches and a row of small brown blotches between the upper pelvic-fin base and the lowermost caudal-fin base).

MK

National Museum of Kenya