Alburnus carianorum, Freyhof & Kaya & Bayçelebi & Geiger & Turan, 2019

Freyhof, Jörg, Kaya, Cüneyt, Bayçelebi, Esra, Geiger, Matthias & Turan, Davut, 2019, Comments on the holotype of Alburnus kurui Mangit & Yerli 2018 and re-description of A. carianorum Freyhof, Kaya, Bayçelebi, Geiger & Turan, 2019 (Teleostei: Leuciscidae), Zootaxa 4550 (4), pp. 594-596 : 595

Alburnus carianorum , new species

Holotype. FFR 0 4677, 95.2 mm SL; Turkey: Muğla prov.: Dalaman River north of Dalaman , 36.815°N 28.802°E.

Paratypes. FFR 0 4618, 58, 30–92 mm SL; Turkey: Muğla prov.: Dalaman River north of Dalaman , 36.815°N 28.802°E.— FSJF 1927 , 2 , 49–51 mm SL; Turkey: Aydın prov.: Büyük Menderes River south of Aydin, 37.783°N 27.839°E.— FSJF 2345 , 26 , 31–84 mm SL; Turkey: Muğla prov.: Dalaman River south of Ortaca , 36.813°N 28.798°E.— FSJF 2565 , 2 , 63–64 mm SL; Turkey: Aydın prov.: stream Çine south of Aydın, 37.762°N 27.8356°E.— FSJF 2580 , 22 , 50–73 mm SL; Turkey: Aydın prov.: stream Çine south of Eskiçine , 37.543°N 28.063°E .

Diagnosis. Alburnus carianorum is distinguished from A. demiri by having fewer branched anal-fin rays (11–13½ vs. 13–14½), fewer scales in the lateral line (40–47 vs. 46–49), more scale rows between the lateral line and the dorsalfin origin (6–8, vs. 9) and fewer gill rakers on the first gill arch (15–19 vs. 18–21). Alburnus carianorum has a slenderer caudal peduncle than A. demiri (8.9–10.5% SL vs.10.5–11.1). Alburnus carianorum is distinguished from A. escherichii from the adjacent Sakarya River drainage and from A. nasreddini from the adjacent Eber, Akşehir and Ilgın Lake basins by having less gill rakers (15–19, mode 18 vs. 12–16, mode 13 in A. escherichii , 13–14, mode 13 in A. nasreddini ), less scales in the lateral line (40–47 vs. 45–53 in A escherichii , 45–51 in A. nasreddini ) and more scale rows between the lateral line and the dorsal-fin origin (6–8 vs. 8–10).

Description. See Figure 1 for general appearance and Table 1 for morphometric data of the holotype. Medium sized, moderately deep and compressed body. Dorsal body profile convex, ventral profile more convex than dorsal profile. No hump at nape. Head short, its upper profile straight at interorbital area, slightly convex at nostrils. Snout short, its length smaller than eye diameter, with slightly round tip. Mouth oblique, lower jaw slightly projecting beyond upper jaw, with slightly developed chin. Eye diameter about equal to interorbital distance. Caudal peduncle depth 1.7–2.3 times in its length.

Lateral line complete, reaching caudal-fin base, with totally 40 (1), 41 (7), 42, (3), 43 (6), 44 (4), 45 (5), 46 (2) and 47 (2) scales. 6 (3), 7 (8) and 8 (19) scale rows between dorsal-fin origin and lateral line, 3 (2), 4 (26) and 5 (2) scale rows between anal-fin origin and lateral line. Dorsal fin with three simple and 7½ (1) and 8½ (29) branched rays, outer margin straight. Anal fin with 3 simple and 11½ (1), 12½ (21) and 13½ (8) branched rays, outer margin slightly convex. Pectoral fin with one simple 13 (13), 14 (14), 15 (2) and 16 (1) branched rays, outer margin slightly convex. Pelvic fin one simple and 7 (2) and 8 (28) branched rays, outer margin slightly convex. Pharyngeal teeth in two rows, 2.5–5.2 or 2.4–5.2, serrated, hooked at tip. Ventral keel, prominent, exposed for 2–8 scales in front of anus. 15 (1), 16 (3), 17 (2), 18 (3) and19 (1) gill rakers on first gill arch. Numerous small tubercles on head in adult males.

Etymology. Named for the Carians, the inhabitants of the ancient province of Caria in the southern Anatolian Aegean basin. A noun in the genitive case.

Distribution. Lower Dalaman and Büyük Menderes River drainages in the Turkish Aegean Sea basin.

Remarks. The description of A. carianorum published here largely repeats the description of the same species published already by Freyhof et al. (2018) and further details on this species are available from that work.

Figures

FIGURE 1. Alburnus carianorum, FFR 04677, holotype, 95.2 mm SL, Turkey: Muğla prov.: Dalaman River north of Dalaman.