Cottus dorofeevi Sideleva & Zhidkov 2024, sp. nov.

• Main Authors: Sideleva, Valentina G., Zhidkov, Zakhar V.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2024
• Subjects: Biodiversity; Taxonomy; Animalia; Chordata; Scorpaeniformes; Cottidae; Cottus; Cottus dorofeevi; dvina
• Online Access: https://doi.org/10.5281/zenodo.11165789; http://treatment.plazi.org/id/03A85444FFEC1856FF6AFA05907636D5

Cottus dorofeevi sp. nov. Figs 2, 9, 10, 11; Tables 1–2 Cottus gobio — Sapunov, 1893 (in part): 238; Cottus gobio koshewnikowi — Berg 1949 (in part): 1147; Zhukov, 1965: 397; Cottus gobio — Leshchenko and Palchevskaya, 2012 (in part): 79. Holotype : ZIN 56916, SL 68.0 mm, Ovsyanka River, a tributary of the Western Dvina, Vitebsk region, Belarus, 55.5907 N 30.4080 E, August 24, 2022, collectors Z. V. Zhidkov and S.A. Dorofeev. Paratypes : ZIN 56917, n = 4, 27.5–66.4 mm, Ovsyanka River, a tributary of the Western Dvina, Vitebsk region, Belarus, 55.5907 N 30.4080 E, August 24, 2022, collectors Z. V. Zhidkov and S.A. Dorofeev; ZIN 56918, n = 2, SL 26.0 and 55.3 mm, Luzhesnyanka River, a tributary of the Western Dvina, Belarus, Vitebsk region, 55.2527 N 30.1431 E, depth 0.5 m, August 22, 2022, collectors Z. V. Zhidkov and S.A. Dorofeev; ZIN 7156, n = 2, SL 71.7 and 74.0 mm, Lake Ostrovito, Vitebsk, August 1886, collector Radivanovsky. Morphological diagnosis. Нead pointed anteriorly and considerably flattened in dorso-ventral direction; presence of dermal papillae on top and sides of head; large bony prickles under pectoral fins; long second dorsal fin (length of its base 40% SL); long pelvic fins reaching anus; incomplete trunk canal of seismosensory system with 25–27 pores, its end on vertical of last rays of anal fin; semicircular shape of genital papilla in males; all fins (including pelvic and anal) with dark spots. The new species differs from the closely related C. koshewnikowi in following features: abundance of melanophores on ventral side of body (vs. absence of melanophores); presence of dermal papillae on upper and lateral parts of head (vs. absence of papillae and presence of dermal wrinkles); longer caudal peduncle (14.6±2.1 vs. 8.3±0.5% SL); large eye diameter (23.1±1.1 vs. 19.1±0.6% of head length); wider interorbital space (16.3±3.4 vs. 9.8±0.5% of head length). Cottus dorofeevi differs from another Eastern European species C. gratzianowi in following characters: absence of branched rays in pectoral ...