Description of two new species of tadpole-gobies (Teleostei: Gobiidae: Benthophilus)

V.S. Boldyrev & N.G. Bogutskaya

Abstract. Benthophilus durrelli and B. ragimovi, two new species of tadpole-gobies, are described. Both belong to an assemblage of Benthophilus species with clearly differentiated dermal ossifications. B. durrelli inhabits estuarine regions, deltas, lower reaches of rivers, and dam lakes in the Sea of Azov basin and is introduced in the Volga. It was hitherto not distinguished from the Azov tadpole-goby, B. stellatus, from which it differs in the posterior position of the second dorsal fin (behind vs. in front of the anal-fin origin), comparatively small (vs. considerable) difference in size of tubercles and granules, rectangular dermal fold with slightly undulated margin (vs. triangular, with clearly undulated margin), narrow (vs. wide) first semiring-like blotch behind the first dorsal fin, and 17-21, commonly 18-20 transverse rows of neuromasts on the flanks (vs. 20-25). B. ragimovi, a deepwater species, is only recorded at western coast of middle and south Caspian from Chechen’ Island to Astara. It differs from the closest congener, B. pinchuki, in the weak (vs. well-developed) depression on the head, absence of granules in the head depression, very small, densely-set granules located on whole upper head surface and anterior part of back, sometimes also on caudal peduncle (vs. enlarged granules located only along the lateral margins of the head depression), reduced first tubercles of the dorsal row (vs. anterior dorsal tubercles of the same size as the posterior ones).

Zoosystematica Rossica, 2004, 13(1): 129–135  ▪  Published in print 28 December 2004


https://doi.org/10.31610/zsr/2004.13.1.129  ▪  Open full article  

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