A new species of the genus Cottus (Scorpaeniformes, Cottidae) from the Baltic Sea Basin and its phylogenetic placement

  • Valentina Sideleva Zoological Institute, Russian Academy of Sciences, Universitetskaya Emb. 1, 199034, Saint Petersburg, Russia https://orcid.org/0000-0002-8866-7779
  • Vytautas Kesminas Institute of Ecology, Nature Research Centre, Akademijos Str. 2, LT-08412, Vilnius, Lithuania
  • Zakhar Zhidkov Zoological Institute, Russian Academy of Sciences, Universitetskaya Emb. 1, 199034, Saint Petersburg, Russia
Keywords: Mitochondrial DNA, morphology, multivariate analysis, Neman, phylogenetic relationships, sculpins


The genus Cottus contains more than 60 species that are common in freshwater bodies of northern Eurasia and North America. Despite the abundance of species, this genus has been insufficiently studied in Eastern European rivers and lakes. The new taxon Cottus cyclophthalmus sp. nov. was found in the Neman/Nemunas and Venta river systems (Baltic Sea Basin). Cottus cyclophthalmus is sister and most morphologically similar to Cottus gobio. The new species has the following diagnostic characters: round, protruding (tubular) eyes near front of head; dermal papillae on top and sides of head, naked body, absence of bony prickles, full trunk canal with 32–36 pores. The description of Cottus cyclophthalmus and a new finding of Cottus microstomus improved understanding of the Eastern European biodiversity.


Alekseev N.I. & Probatov A.N. 1969. Zoogeographic essay of freshwater ichthyofauna of Kaliningrad region area. Proceedings Kaliningrad Technical Institute of Fishing Industry and Economy 24: 7–16. [In Russian.]

Berg L.S. 1949. Freshwater Fishes of Soviet Union and Adjacent Countries. Part 3. Academy of Sciences of USSR, Moscow. [In Russian.]

Bravničar J., Palandačić A., Jelić D., Podgornik S. & Snoj A. 2021. Molecular data reveal distinct phylogenetic position of Cottus metae, establish its distribution range, and invalidate the species status of C. scaturigo. Journal of Zoological Systematics and Evolutionary Research 59 (2): 428–441. https://doi.org/10.1111/jzs.12434

Freyhof J., Kottelat M. & Nolte A. 2005. Taxonomic diversity of European Cottus with description of eight new species (Teleostei: Cottidae). Ichthyological Exploration of Freshwaters 16 (2): 107–172.

Goto A., Yokoyama R. & Sideleva V.G. 2015. Evolutionary diversification in freshwater sculpins (Cottoidea): a review of two major adaptive radiations. Environmental Biology of Fishes 98 (1): 307–335. https://doi.org/10.1007/s10641-014-0262-7

Huelsenbeck J.P. & Ronquist F. 2001. MRBAYES: Bayesian inference of phylogenetic trees. Bioinformatics 17 (8): 754–755. https://doi.org/10.1093/bioinformatics/17.8.754

Kocher T.D., Thomas W.K., Meyer A., Edwards S.V., Pääbo S., Villablanca F.X. & Wilson A.C. 1989. Dynamics of mitochondrial DNA evolution in animals: amplification and sequencing with conserved primers. Proceedings of the National Academy of Sciences 86 (16): 6196–6200. https://doi.org/10.1073/pnas.86.16.6196

Kontula T. & Väinölä R. 2001. Postglacial colonization of Northern Europe by distinct phylogeographic lineages of the bullhead, Cottus gobio. Molecular Ecology 10 (8): 1983–2002. https://doi.org/10.1046/j.1365-294X.2001.01328.x

Kumar S., Stecher G., Li M., Knyaz C. & Tamura K. 2018. MEGA X: molecular evolutionary genetics analysis across computing platforms. Molecular Biology and Evolution 35 (6): 1547–1549. https://doi.org/10.1093/molbev/msy096

Nguyen L.T., Schmidt H.A., Von Haeseler A. & Minh B.Q. 2015. IQ-TREE: a fast and effective stochastic algorithm for estimating maximum-likelihood phylogenies. Molecular Biology and Evolution 32 (1): 268–274. https://doi.org/10.1093/molbev/msu300

Rozas J., Ferrer-Mata A., Sánchez-DelBarrio J.C., Guirao-Rico S., Librado P., Ramos-Onsins S.E. & Sánchez-Gracia A. 2017. DnaSP 6: DNA sequence polymorphism analysis of large data sets. Molecular Biology and Evolution 34 (12): 3299–3302. https://doi.org/10.1093/molbev/msx248

Sideleva V.G. 1982. Seismosensory System and Ecology of Baikal Sculpin (Cottoidei). Nauka, Novosibirsk. [In Russian.]

Sideleva V.G. 2009. A new species of sculpin Cottus sabaudicus sp. nova (Scorpaeniformes: Cottidae) from the Savoy region, France. Journal of Ichthyology 49 (3): 209–214.

Sideleva V.G., Prirodina V.P., Reshetnikov Y.S. & Zhidkov Z.V. 2015a. Redescription of Cottus koshewnikowi (Cottidae) and its morphological variability in tributaries of the Upper Volga. Journal of Ichthyology 55 (1): 30–39. https://doi.org/10.1134/S0032945215010191

Sideleva V.G., Naseka A.M. & Zhidkov Z.V. 2015b. A new species of Cottus from the Onega River drainage, White Sea basin (Actinopterygii: Scorpaeniformes: Cottidae). Zootaxa 3949 (3): 419–430. https://doi.org/10.11646/zootaxa.3949.3

Sideleva V.G., Naseka A.M., Nowak M. & Palandačić A. 2019. The finding of holotype and redescription of Cottus microstomus Heckel 1837 (Cottidae). Ichthyological Research 66: 249–257. https://doi.org/10.1007/s10228-018-00676-4

Šlechtová V., Bohlen J., Freyhof J., Persat H. & Delmastro G.B. 2004. The Alps as barrier to dispersal in cold-adapted freshwater fishes? Phylogeographic history and taxonomic status of the bullhead in the Adriatic freshwater drainage. Molecular Phylogenetics and Evolution 33 (1): 225–239. https://doi.org/10.1016/j.ympev.2004.05.005

Somers K.M. 1986. Multivariate allometry and removal of size with principal components analysis. Systematic Biology 35 (3): 359–368.

Taliev D.N. 1955. Sculpins of Lake Baikal (Cottoidei). Academy of Sciences of USSR, Moscow. [In Russian.]

Tylik K.V. & Shibaev S.V. 2008 (eds) Lake Vyshtynetskoe. Kaliningrad State Technical University, Kaliningrad. [In Russian.]

Witkowski A. 1979. A taxonomic study on freshwater sculpins of genus Cottus Linnaeus, 1758 (Cottus gobio L. and Cottus poecilopus Heck.) in Poland. Acta Universitatis Wratislaviensis 458: 1–95.

Yabe M. 1985. Comparative osteology and myology of the superfamily Cottoidea (Pisces: Scorpaeniformes), and its phylogenetic classification. Memoirs of the Faculty of Fisheries, Hokkaido University 32 (1): 1–130.

Yokoyama R. & Goto A. 2005. Evolutionary history of freshwater sculpins, genus Cottus (Teleostei; Cottidae) and related taxa, as inferred from mitochondrial DNA phylogeny. Molecular Phylogenetics and Evolution 36 (3): 654–668. https://doi.org/10.1016/j.ympev.2005.06.004

Yokoyama R., Sideleva V.G., Shedko S.V. & Goto A. 2008. Broad-scale phylogeography of the palearctic freshwater fish Cottus poecilopus complex (Pisces: Cottidae). Molecular Phylogenetics and Evolution 48: 1244–1251. https://doi.org/10.1016/j.ympev.2008.02.002

Zhang J., Kapli P., Pavlidis P. & Stamatakis A. 2013. A general species delimitation method with applications to phylogenetic placements. Bioinformatics 29 (22): 2869–2876. https://doi.org/10.1093/bioinformatics/btt499

Zhukov P.I. 1958. Fishes of the Neman River basin (within Belorussian SSR). Belgosizdat, Minsk. [In Russian.]

Zograf Y.N. 1907. Preliminary Report on the Trip with Ichthyological Purpose to Sventsyanskiy, Vilenskiy and Trokskiy Districts of Vil’na Province and Grodno District of Grodno Province in 1904. Proceedings of Department of Ichthyology of Imperial Russian Society for Acclimatization of Animals and Plants 5, Moscow. [In Russian.]

How to Cite
Sideleva, V., Kesminas, V., & Zhidkov, Z. (2022). A new species of the genus Cottus (Scorpaeniformes, Cottidae) from the Baltic Sea Basin and its phylogenetic placement. European Journal of Taxonomy, 834(1), 38-57. https://doi.org/10.5852/ejt.2022.834.1897
Research article