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| Chondrostoma smyrnae Küçük, Çiftçi, Güçlü & Turan, 2021 DOI: 10.3897/zse.97.63691 |
Abstract
Chondrostoma smyrnae, a new species, from the Tahtalı reservoir drainage is distinguished by having a slightly arched lower jaw with a well-developed keratinised edge, a deep and cylindric body, a complete lateral line with 47–52+1 total scales, 8–9 scale rows between the lateral line and the dorsal-fin origin, 4 scale rows between the lateral line and the pelvic fin-origin, and 19–23 gill rakers on the first gill arch. Moreover, molecular analyses using full cyt b (1141 bp) and partial coI (652 bp) sequences of the mitochondrial genome from specimens of the new species, C. smyrnae and specimens belonging to other Chondrostoma species from central and western Anatolia demonstrated that the C. smyrnae is easily differentiated by their high pairwise genetic distances of cyt b and coI data set (>2.20 and 1.03%, respectively) and by their position in the phylogenetic trees obtained through Maximum Likelihood (ML) methodology.
Key Words: Cytochrome b, Cytochrome oxidase I, freshwater fish, taxonomy, Western Anatolia
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| Figure 3. a. Chondrostoma smyrnae, IFC-ESUF 03–1567, just after fixation form, 167 mm SL, Turkey: Tahtalı reservoir; b. IFC-ESUF 03–1566, holotype, 191 mm SL, Turkey: Tahtalı reservoir; c. IFC-ESUF 03–1567, paratype 205 mm SL, Turkey: Tahtalı reservoir; d. Chondrostoma turnai, IFC-ESUF 03–1557, 197 mm SL, Turkey: Çine stream. |
Chondrostoma smyrnae sp. nov.
Diagnosis: Chondrostoma smyrnae is distinguished from other species occur to adjacent basin by a cylindrical body (body width at dorsal-fin origin 16.8–19.3% SL, vs. 13.3–15.4 in C. turnai (Fig. 3d), 14.1–16.6 in C. meandrense, 12.0–16.3 in C. holmwoodii, 12.4–15.7 in C. fahirae, except C. beysehirense), a wider head (head width at anterior margin of eye 55–65% HL, vs. 42–54), by having less lateral line scales (48–53 vs. 60–67 in C. beysehirense, 60–66 in C. holmwoodii and 56–60 in meandrense, except C. turnai and C. fahirae). Chondrostoma smyrnae is further distinguished from C. turnai by the absence keel between pelvic fin-origin and anus (vs. present in specimens larger than 160 mm SL), a straight or slightly arched lower jaw (vs. arched), more total lateral line scales (48–53, vs. 44–51), and fewer gill rakers on first gill arch (19–23, vs. 22–27). Also, C. smyrnae further differs from C. turnai by the shape of jaws, hyomandibular, quadrate and the fifth brachial gill arc. In C. smyrnae, the dentary thick and coronoid process inclined forward (vs. thin and coronoid process nearly vertical); premaxilla very deep and posterior edge short (vs. slender and posterior edge long); hyomandibular long and narrow (vs. short and wide), the fifth brachial gill arc wide angle (vs. narrow angle) and pharyngeal teeth wide (vs. thin); outer margin of quadrate slightly pointed (vs. rounded) (Figs 4, 5).
Etymology: The species is named for Smyrna, the historic name of the city known today as Izmir. A noun in genitive, indeclinable.
Fahrettin Küçük, Yılmaz Çiftçi, Salim Serkan Güçlü and Davut Turan. 2021. Chondrostoma smyrnae, A New Nase from the Tahtalı Reservoir Drainage in the Aegean Sea Basin (Teleostei, Leuciscidae). Zoosystematics and Evolution. 97(1): 235-248. DOI: 10.3897/zse.97.63691
