Alburnoides kosswigi, Turan, Davut, Kaya, Cüneyt, Bayçelebi, Esra, Bektaş, Yusuf & Ekmekçi, F. Güler, 2017

Turan, Davut, Kaya, Cüneyt, Bayçelebi, Esra, Bektaş, Yusuf & Ekmekçi, F. Güler, 2017, Three new species of Alburnoides from the southern Black Sea basin (Teleostei: Cyprinidae), Zootaxa 4242 (3), pp. 565-577 : 573-575

Alburnoides kosswigi , new species

( Fig. 5 )

Holotype. FFR 0 1064, 80 mm SL; Turkey: Kütahya prov.: stream Porsuk about 3 km south of Hacıazizler , 39°20'59"N, 30°02'17"E; D. Turan, C. Kaya and E. Bayçelebi, 17 Aug. 2014.

Paratypes. FFR 0 1135, 39, 40–61 mm SL; same data as holotype. — FFR 0 1107, 25, 41–82 mm SL; Turkey: Eskişehir prov.: stream Porsuk about 7 km south of Sazak , 39°43'26"N, 31°37'09"E; D. Turan, C. Kaya and E. Bayçelebi, 0 4 Sep. 2012. — FFR 0 1133, 52, 48–97 mm SL; Turkey: Ankara prov.: stream Kirmir about 2 km south of Yeşilöz , 40°14'13"N, 32°15'43"E; D. Turan, C. Kaya and E. Bayçelebi, 4 Sep. 2014. — FFR 0 1060, 27, 33–72 mm SL; Turkey: Ankara prov.: stream İlhanlı about 2 km south of İlhanköy , 40°05'38"N, 32°14'53"E; D. Turan, 15 June 2005.

Diagnosis. Alburnoides kosswigi is distinguished from A. fasciatus by having a scaleless keel between the posterior pelvic base and the anus, rarely with 1-3 scale covering the anterior part of the keel [ Fig. 2 f] (vs. covered by (2) 3–5 scales [ Fig. 2 b]). Alburnoides kosswigi has fewer branched anal-fin rays (11½–13½, rarely 14½ vs. 13½–15½) and fewer abdominal vertebrae (20–21 vs. vs. 21–22) than A. fasciatus . In Alburnoides kosswigi , the tip of the upper lip is slightly projecting beyond lower lip (vs. not projecting in A. fasciatus ).

Alburnoides kosswigi is distinguished from A. tzanevi by having a scaleless keel between the posterior pelvic base and the anus, rarely with 1-3 scale covering the anterior part of the keel [ Fig. 2 f] (vs. covered by 5–7 scales [ Fig. 2 c]). Also, A. kosswigi has a deeper body (body depth dorsal-fin origin 26–31% SL, mean 29 vs. 24–27, mean 25) and a wider interorbital distance (7–10% SL, mean 9 vs. 6–8, mean 7). In A. kosswigi , the interorbital distance is wider than the eye diameter and the snout length (vs. snout length equal to interorbital distance but smaller than eye diameter). Alburnoides kosswigi also has a deeper anal-fin (18–21% SL, 20.1 vs. 17–19, mean 17.7) and a longer pelvic-fin (16–20% SL, mean 18.1 vs. 14–17, mean 16.2).

Alburnoides kosswigi is distinguished from A. manyasensis by having a scaleless keel between the posterior pelvic base and the anus, rarely with 1-3 scale covering the anterior part of the keel [ Fig. 2 f] (vs. covered by (2) 3– 5 scales [ Fig. 2 d]) and a more slender caudal peduncle (9–11% SL vs. 11–12). In A. kosswigi , the upper lip is slightly projecting beyond the lower lip in most specimens (vs. not projecting) and the interorbital distance is greater than eye diameter (vs. smaller than eye diameter).

Alburnoides kosswigi is distinguished from A. kurui by having fewer gill rakers (5–7 vs. 7–9), fewer scale rows between the lateral-line and the anal-fin origin (3–5 vs. 5–7), fewer branched anal-fin rays (11–14½ vs. 13–15½), fewer total vertebrae (39–42 vs. 42–43) and fewer caudal vertebrae (19–21 vs. 21–22). In A. kosswigi , the eye diameter is greater than the snout length (vs. almost equal) and the body depth at the dorsal-fin origin is 0.9–1.0 times in the head length (vs. 0.8–0.9).

Alburnoides kosswigi is distinguished from A. freyhofi by having a more slender body (body depth at dorsal-fin origin 0.9–1.0 times in head length vs. 0.8–0.9) and a longer caudal peduncle (17–22% SL vs. 14–18). Alburnoides kosswigi has fewer branched anal-fin rays (11–13½, rarely 14½ vs. 14–16½) and a shorter anal-fin base (16–20% SL vs. 20–25). In A. kosswigi , the upper lip is slightly projecting beyond the lower lip in most individuals (vs. not projecting).

Description. For general appearance see Fig. 5 . Morphometric and meristic data are provided in Table 2 –3. Body moderately deep, slightly compressed laterally. Dorsal profile slightly convex, ventral profile equal or less convex than dorsal profile. Distance between pelvic-fin origin and anal-fin origin 1.2–1.4 times in distance between pectoral-fin origin and pelvic-fin origin. Head 0.9–1.0 times in body depth at dorsal-fin origin, interorbital area and snout slightly convex. Caudal-peduncle depth 1.8–2.2 times in its length. Snout short and with slightly pointed tip, snout length smaller than both eye diameter and interorbital distance. Mouth terminal in most individuals, without chin. Tip of upper lip slightly projecting beyond lower lip in most individuals. Tip of mouth cleft approximately at level of middle of pupil or slightly above. Ventral keel well developed, scaleless or rarely 1– 3 scales covering anterior portion of keel ( Fig. 2 f). Largest known specimen 97 mm SL.

Lateral-line with 43–57 scales, 8–12 scale rows between lateral-line and dorsal-fin origin and 3–5 scale rows between lateral-line and anal-fin origin. Gill rakers 1–2 + 4–6 = 5–7 on outer side of first gill arch. Dorsal fin with 3 simple and 8½–9½ branched rays, outer margin straight. Pectoral fin with 1 simple and 13–15 branched rays, outer margin slightly convex or convex. Pelvic fin with 1 simple and 6–7 branched rays, outer margin convex. Anal fin with 3 simple and 11½–13½ (14½) branched rays, outer margin concave posteriorly. Caudal-fin moderately forked, lobes slightly rounded.

Pharyngeal teeth 2.5–4.2, markedly hooked at tip not serrated. Total vertebrae 39 (1), 40 (15), 41 (8) and 42 (4), predorsal vertebrae 13 (13) and 14 (15), abdominal vertebrae 20 (13) and 21 (15) and caudal vertebrae 19 (2), 20 (22) and 21 (4). Abdominal region equal or longer than caudal region, and difference between abdominal and caudal numbers varies from zero to +1. Vertebral formulae 20+19 (1), 20+20 (13), 21+20 (11) and 21+21 (3).

Sexual dimorphism. Male with small tubercles on scales, head and rays of anal and dorsal fins.

Coloration. Formalin-preserved individuals brownish on back and upper part of flank, light yellowish on lower part of flank and belly. Spots along lateral line above and below pores distinct in anterior part of flank, indistinct on caudal peduncle in most individuals. A distinct narrow black stripe on upper part of flank from posterior margin of operculum to caudal peduncle, its width smaller than eye diameter. Very few pigment cells on pockets of flank scale in most individuals. Caudal, dorsal and anal fins grey; pectoral and pelvic fins yellowish. Numerous black pigment cells on all fin rays.

Distribution and notes on biology. Alburnoides kosswigi is known from the Sakarya River drainage. See Fig. 1 for a map of the findings of this species. It inhabits swift and clear flowing water with cobble and pebbles.

Etymology. The species is named for Curt Kosswig (Hamburg & Istanbul), the father of ichthyology in Turkey. A noun in genitive, indeclinable.

Figures

FIGURE 2. Ventral keel: a, Alburnoides kurui, FFR 0 1032, 83 mm SL; b, A. fasciatus, FFR 0 1012, 88 mm SL; c, A. tzanevi, FFR 0 1146, 81 mm SL; d, A. manyasensis, FFR 0 1144, 77 mm; e, A. freyhofi, FFR 01149, 87 mm SL; f, A. kosswigi, FFR 0 1133, 87 mm.

FIGURE 5. Alburnoides kosswigi; a; holotype, FFR 0 1064, 80 mm SL; b,, FFR 0 1135, paratype, 63 mm SL; c, FFR 0 1135, paratype, 61 mm SL; Turkey: Kütahya prov.: stream Porsuk about 3 km south of Hacıazizler.