Round-Eyed Sculpin

description

Description Body shortened, its average maximum depth at origin of first dorsal fin four times SL. Body massive, preanal distance more than half SL. Caudal peduncle short, its length 14 – 17 % SL (14.9 % in holotype), average height of caudal peduncle half its length (Table 1). Trunk naked, bony prickles (modified scales) absent. Head large with smooth dorsal profile from head to back, its length more than 30 % SL in type specimens (33 % in holotype). Dermal papillae numerous on top and sides of head, sometimes in form of circles. Postorbital length large, always more than half head length (53 % HL in holotype). Snout short, more than half postorbital length (59.4 % in holotype). Anterior nostrils small, tubular, highly pigmented; posterior nostrils in form of short tubes. Mouth small, terminal; upper jaw does not reach vertical line of anterior edge of eye. Teeth on jaws and vomer small, numerous, of same shape and size. Upper lip thick, fleshy, twice thicker than lower lip. Eye round and protruding, near to front of head, average eye diameter 7.3 % SL (7.4 % SL or 22.4 % HL in holotype). Interorbital space narrow, on average 1.5 times less than eye diameter. Preoperculum with thr

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

description

Variation of morphometric features and numbers of rays in Cottus cyclophthalmus sp. nov. For a comparative analysis of morphometric characters of type and non-type specimens of Cottus cyclophthalmus sp. nov. from the rivers Krasnaya, Neris, Šerkšnė, Siesartis and Žeimena, PCA was used (Fig. 4). The variability of 26 external features was analyzed. (Table 2). The principal component analysis revealed a variability of initial data. This data is represented in a scatter plot with uncorrelated second and third principal components. Each component reflects a proportion of a variability of variance-covariance matrix of features. The conducted analysis showed that the first principal component describes 84.6 % of total variability of measurements in five studied samples of sculpins. The first component is characterized by close positive values of factor loadings (from 0.758 to 0.982, or 0.918 on average). All other 25 components describe 15.4 % of total variability. Figure 4 shows morphospaces of studied samples in the space of second and third components. The morphospaces of samples of C. cyclophthalmus overlap significantly. There are no discrete geographic groupings. This indicates tha

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

description

urn: lsid: zoobank. org: act: B 28 C 4 DA 1 - 772 B- 47 FD- 9 CF 3 - 39 EA 5 BD 7 ED 93 Figs 2 – 3; Table 1

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

diagnosis

Diagnosis C ottus cyclophtalmus sp. nov. has round, protruding (tubular) eyes near front of head; dermal papillae present on top and sides of head, body naked, bony prickles absent; full trunk canal with 32 – 36 pores.

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