New genus of the family Cyclopteridae – Microancathus gen. nov. (Pisces: Cottoidei: Cyclopteridae) with description of a new species Microancathus tokranovi sp. n

O.S. Voskobojnikova

Proceedings of the Zoological Institute RAS, 2015, 319(2): 215–228 · https://doi.org/10.31610/trudyzin/2015.319.2.215

Full text

Abstract

A new cyclopterid genus Microancathus gen. n. is established for a new species M. tokranovi sp. n. and Eumicrotremus fedorovi Mandritza, 1991. The unique characteristics of the new genus are: the existence of only one pore in the infraorbital seismosensory canal of the head; flat or hemispherical (not conical) bone plaques on the body covered with numerous small spines; opercle with the conspicuous notch of the posterior edge and S-shaped subopercle replicating the shape of the posterior edge of opercle. The new species M. tokranovi is characterized by the greatest in the family height of the body (61–75% SL), and lesser developed bone plaques than in M. fedorovi. Small specimens (lesser than 47 mm SL) possess bone plaques on the anterior part of the body only; bony plaques absent on the caudal part, on rays of the first dorsal fin and on the head. Larger fishes have bone plaques on mentioned parts of body, but these plaques are small and occupy the central part of the underlying connective-tissue tubercles only. The bone plaques of M. tokranovi are flatter than in M. fedorovi. The first vertebra is included in the occipital region of the neurocranium in the both species, but the first neural arch is directed dorso-posteriorly in M. tokranovi, and is strictly dorsal in M. fedorovi.

Key words

cyclopterid fishes, morphology, systematics, Cyclopteridae, Microancathus, M. tokranovi, M. fedorovi

Submitted March 26, 2015 · Accepted April 29, 2015 · Published June 25, 2015

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