Oxynoemacheilus nasreddini Yoğurtçuoğlu, Kaya & Freyhof 2021

Yoğurtçuoğlu, Baran, Kaya, Cüneyt & Freyhof, Jörg, 2022, Revision of the Oxynoemacheilus angorae group with the description of two new species (Teleostei: Nemacheilidae), Zootaxa 5133 (4), pp. 451-485 : 470

Oxynoemacheilus nasreddini Yoğurtçuoğlu, Kaya & Freyhof 2021

( Fig. 12 )

Oxynoemacheilus nasreddini Yoğurtçuoğlu, Kaya & Freyhof 2021:138 , Figs. 2–5 (type locality: Aksu stream at Ayvalı, 6 km north of Sincanlı, 38.8101 30.2560, Turkey)

Material examined. FFR 15588, holotype, 54 mm SL ; FFR 15589, paratypes, 8, 42–57 mm SL; Turkey: Afyon prov.: Aksu stream at Ayvalı, 6 km north of Sincanlı , 38.8101 30.2560 .— FFR 15607, 2 , 52–53 mm SL; Turkey: Afyonkarahisar prov.: stream flowing into Seyitler reservoir at İscehisar , 38.8160 30.7870 .— FFR 1537 , 35 , 30–66 mm SL; Turkey: Afyonkarahisar prov.: Kali stream at İnli, 1 km south to Maltepe , 38.6004 30.8934 .— FFR 1565 , 7 , 54–76 mm SL; Turkey: Konya prov.: Deliköyboğazı stream 1 km south to Ilgın 38.2370 31.8834 .— FSJF 3209 , 8 , 58–78 mm SL; Turkey: Konya prov.: stream Ali (Karacaağaç) at Doğanhisar , 38.1356 31.6674 .— IUSHM 2021- 1429 , 2 , 63–67 mm SL;— FSJF 3096 , 3 , 66–71 mm SL; Turkey: Isparta prov.: Özdere stream at Eğirler, 8 km northeast of Gelendost , 38.1976 31.1074 .— FFR 15523, 10 , 42–68 mm SL; Turkey: Isparta prov.: Özdere stream at Madenli, 6 km northeast of Gelendost , 38.1813 31.1008 .— FSJF 2471 , 2 , 60–67 mm SL; Turkey: Isparta prov.: lower stream Çayköy at Koysazı bridge, 37.8415 30.8916 .— FSJF 2516 , 1 , 61 mm SL; Turkey: Isparta prov.: middle stream Çayköy above Kemerköprü water regulator, 37.8376 30.9008 .

Additional distribution records. Yeğen et al. 2007: 38.7894 30.0961, 39.0167 30.4681, 39.0533 30.4839, 39.0919 30.4406; Yoğurtçuoğlu et al. 2021a: 38.4473 31.5175, 38.5420 38.5420, 38.7790 30.7910, 38.7880 30.0290, 38.9600 30.4460, 38.9440 30.4420, 38.8550 30.1630, 30.8080 30.3380.

Diagnosis. Oxynoemacheilus nasreddini is distinguished from other species of O. angorae group by a combination of characters, none unique to the species. It is distinguished from O. mediterraneus and O. anatolicus by having a more slender caudal peduncle (caudal-peduncle depth 1.5–2.1 times in length vs. 1.2–1.5 in O. mediterraneus and 1.3–1.6 in O. anatolicus ). It is further distinguished from O. mediterraneus by an emarginate caudal fin (middle caudal-fin ray 76–91% of length of longest upper caudal-fin ray vs. deeply emarginate, 65–76), a slowly decreasing body depth between the dorsal- and caudal-fin bases (depth of caudal peduncle 70–86% of body depth at anteriormost dorsal fin base vs. almost uniform, 85–92), and the flank blotches being usually disconnected from the saddles on the back, rarely 1–2 flank blotches connected (vs. usually all connected). Oxynoemacheilus nasreddini is further distinguished from O. anatolicus , O. angorae , O. isauricus and O. eregliensis by having few embedded scales on the belly (vs. belly without scales), and the dorsal part of the head and the upper part of the cheek with a vermiculate or marbled pattern (vs. mottled). It is further distinguished from O. angorae by having irregularly shaped and set, vertically elongated blotches on the flank, rarely a mottled or marbled pattern (vs. a series of dark-brown midlateral blotches usually fused into a wide, irregular shaped midlateral stripe, rarely a mottled pattern), the tip of the pectoral fin usually reaching to or slightly beyond the pelvic-fin origin in the male (vs. not reaching), a longer pre-pelvic length (51–55% SL vs. 48–51), a smaller distance between the pelvic- and anal-fin origins (20–23% SL vs. 23–28), and 8–10 pores in the preoperculo-mandibular canal (vs. 10–13). It is further distinguished from O. isauricus by having a deeper caudal peduncle (caudal-peduncle depth 1.5–2.1 times in length vs. 2.2–2.6), a more posteriorly positioned pelvic fin (pre-pelvic length 51–55% SL vs. 48–51), and usually a series of short bars on caudal peduncle (vs. a series of midlateral blotches on flank). It is further distinguished from O. eregliensis by having a series of vertically elongated blotches along the lateral midline or slightly below, rarely a mottled pattern (vs. irregularly set and shaped, often round blotches, usually forming a marbled pattern), anal and pelvic fins without brown blotches (vs. present in individuals larger than 50 mm SL), anal-fin origin and anal-fin base without pigmentation (vs. usually with a brown blotch at anal-fin origin, often with brown anal-fin base), a smaller distance between the pelvic- and anal-fin origins (20–23% SL vs. 23–26), and a longer anal fin (anal fin length 16–19% SL vs. 14–16). Oxynoemacheilus nasreddini is differentiated from O. germencicus by having the tip of the pelvic fin usually not reaching to the anus (vs. reaching), and a prominent inner axial stripe (vs. absent).

Distribution. Oxynoemacheilus nasreddini is found in tributaries of the endorheic Lake Akşehir, Eber, Eğirdir and Ilgın basins in Central Anatolia.

Figures

FIGURE 2. Records of species of the Oxynoemacheilus angorae group. Black fine lines stand for basin boundaries. Lake Ilgın catchment is shown within the Sakarya River Basin

FIGURE 3. Oxynoemacheilus anatolicus, FFR 15590, 60 mm SL; stream flowing to Karamanlı reservoir.

FIGURE 4. Oxynoemacheilus angorae, from top: FSJF 2579, 65 mm SL; Battal stream; not preserved, about 60 mm SL, same place as FSJF 1939; Pürtek stream; FSJF 2878, 67 mm SL; Yıldız stream; FSJF 1939, 55 mm SL; Pürtek stream; not preserved, about 60 mm SL, same place as FSJF 2498; Bayındır stream.

FIGURE 5. Oxynoemacheilus eregliensis, from top: FFR 15612, 57 mm SL; Aslandoğmuş spring; FSJF 3116, 64 mm SL; Manavgat River; not preserved, about 60 mm SL, same data as FSJF 2326; stream at Kıreli; not preserved, about 70 mm SL, same place as FSJF 2267; Eflatun Pınarı; FSJF 2003, 48 mm SL; Ibdala stream.

FIGURE 12. Oxynoemacheilus nasreddini, from top: Not preserved, about 70 mm SL; stream Battal; not preserved, about 70 mm SL; same place as FSJF 3205, stream Aksu; paratype FSJF 3209, 75 mm SL; stream Ali.