Alburnoides kurui, 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 : 567-569

Alburnoides kurui , new species

( Fig. 3 )

Holotype. FFR 0 1041, 90 mm SL; Turkey: Ordu prov.: stream Tifi at Gökçebayır ; 40°47'57"N, 36°43'50"E; Ş. Akın, 0 3 Sep. 2012.

Paratypes. FFR 0 1104, 18, 60–90 mm SL; same data as holotype. — FFR 0 1126, 43, 40–82 mm SL; Turkey: Samsun prov.: stream Tersakan at Havza ; 40°59'23"N, 35°43'03"E; D. Turan, C. Kaya and E. Bayçelebi, 0 5 Sep. 2014. — FFR 0 1097, 5, 55–65 mm SL; Turkey: Tokat prov.: Yeşilırmak south of Umutlu ; 40°45'44"N, 36°29'11"E; D. Turan, C. Kaya and E. Bayçelebi, 20 Sep. 2012.

Diagnosis. Alburnoides kurui is distinguished from A. fasciatus by having a scaleless keel between the posterior pelvic base and the anus, rarely with 1 scale covering the anterior part of the keel ([ Fig. 2 a] vs. covered by (2) 3–5 scales [ Fig.2 b]). It also distinguished from A. fasciatus by having less predorsal vertebrae (13–14 vs. 14– 15) and less abdominal vertebrae (20–21 vs. 21–22). Alburnoides kurui also has more scale rows between the lateral-line and the anal-fin origin (5–7 vs. 4–5)

Alburnoides kurui is distinguished from A. tzanevi by having a scaleless keel between the posterior pelvic base and the anus, rarely with 1 scale covering the anterior part of the keel [ Fig. 2 a] (vs. covered by 5–7 scales [ Fig. 2 c]). In addition, A. kurui distinguished from A. tzanevi by having more lateral-line scales (50–59 vs. 43–52), more branched anal-fin rays (13½–15½ vs. 11½–12½), more scale rows between the lateral-line and the dorsal-fin origin (10–12 vs. 9–10), more scale rows between the lateral-line and the anal-fin origin (5–7 vs. 4) and more total vertebrae (42–43 vs. 40–42). Alburnoides kurui has a deeper body than A. tzanevi (body depth at dorsal-fin origin 27–32% SL vs. 24–27), a greater predorsal length (54–58% SL vs. 51–54), a greater interorbital distance (8–10% SL vs. 6–8) and a deeper anal-fin (19–23% SL vs. 17–19).

Alburnoides kurui is distinguished from A. manyasensis by having a scaleless keel between the posterior pelvic base and the anus, rarely with 1 scale covering the anterior part of the keel [ Fig. 2 a] (vs. covered by (2) 3–5 scales [ Fig. 2 d]). Alburnoides kurui also has more branched anal-fin rays (13–15½ vs. 10–12½), more scale rows between the lateral-line and the anal-fin origin (5–7 vs. 4–5) and more total vertebrae (42–43 vs. 40–42). Alburnoides kurui also has a greater interorbital distance (8–10% SL vs. 7–8). In Alburnoides kurui , the interorbital distance is greater than the eye diameter (vs. eye diameter greater than interorbital distance).

Description. For general appearance see Fig. 3 . Morphometric and meristic data are provided in Table 2 –3. Body moderately deep and slightly compressed laterally. Dorsal profile convex, ventral profile less convex than dorsal profile. Distance between pelvic-fin origin and anal-fin origin 1.1–1.5 times in distance between pectoral-fin origin and pelvic-fin origin. Head short, approximately 0.8–0.9 times in body depth at dorsal-fin origin, dorsal snout profile slightly convex, interspace between the eyes convex. Caudal-peduncle depth 1.4–2.2 times in its length. Snout tip slightly pointed, snout length almost equal to eye diameter but shorter than interorbital width. Mouth slightly subterminal in most individuals. Tip of upper lip slightly projecting beyond lower lip; ventral keel well-developed and scaleless or with rarely 1 scale covering the anterior part of the keel ( Fig. 2 a). Largest known specimen 90 mm SL.

Lateral-line with 50–59 scales, 10–12 scale rows between lateral-line and dorsal-fin origin and 5–7 scale rows between lateral-line and anal-fin origin. Gill rakers 1–2 + 5–7 = 7–9 on outer side of first gill arch. Dorsal fin with 3 simple and 7½–8½ branched rays, outer margin straight. Pectoral fin with 1 simple and 13–15 branched rays, outer margin convex. Pelvic fin with 1 simple and 6–7 branched rays, outer margin convex. Anal fin with 3 simple and 13½–15½ branched rays, outer margin concave. Caudal-fin forked, lobes pointed.

Pharyngeal teeth 2.4–5.2, markedly hooked at tip and not serrated below. Total vertebrae 42 (13) and 43 (2), predorsal vertebrae 13 (6) and 14 (9), abdominal vertebrae 20 (2) and 21 (13) and caudal vertebrae 21 (11) and 22 (4). Abdominal region equal or shorter than caudal region, and difference between abdominal and caudal numbers varies from +1 to -2. Vertebral formulae 20+22 (1), 21+21 (11) and 21+22 (13).

Sexual dimorphism. There are numerous small tubercles on head in males and anal-fin rays.

Coloration. Formalin-preserved individuals grey to yellowish on back and upper part of flank, yellowish on lower part of flank and belly. Spots along lateral line above and below pores distinct in anterior part of flank but faded on caudal peduncle in most individuals. A black stripe present on upper part of flank from posterior margin of operculum to hypural complex, its width equal or smaller than eye diameter. Numerous very small black spots on pockets of flank scale in most individuals. Caudal and dorsal fins dark-grey; pectoral, pelvic and anal fins yellowish. Few or numerous black pigment cells on all fin rays.

Distribution and notes on biology. Alburnoides kurui is known from the Yeşilırmak 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 Mustafa Kuru (Ankara) for his contribution to the knowledge of the ichthyofaunal of 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 3. Alburnoides kurui; a, FFR 0 1041, holotype, female, 90 mm SL; b, FFR 0 1104, paratype, 81 mm SL; c, FFR 0 1104, paratype, 65 mm SL; Turkey: stream Tifi at Gökçebayır.