Baetiella tuberculata ( Kazlauskas, 1963 )

Shi, Weifang & Tong, Xiaoli, 2015, Taxonomic notes on the genus Baetiella Uéno from China, with the descriptions of three new species (Ephemeroptera: Baetidae), Zootaxa 4012 (3), pp. 553-569 : 566

Baetiella tuberculata ( Kazlauskas, 1963)

( Figs. 51, 54 )

Baetiella japonica na: Imanishi, 1940: 227;

Pseudocloeon (Baetiella) tuberculatum: Kazlauskas, 1963: 586 ; Baetis (Baetiella) tuberculatum: Novikova & Kluge, 1987: 16 ; Baetiella tuberculata: Waltz & McCafferty, 1987: 563 ; Park et al, 1996: 58.

Diagnosis. Vertex of head yellowish brown with two irregular longitudinal brown stripes ( Fig. 54 ). Surface of pronotum yellow with three pairs of distinct dark brown tubercles, two pairs near the middle line, one pair near posterior margin sublaterally; meso- and metanota yellowing brown with two pairs of longitudinal dark brown stripes ( Fig. 54 ). Thoracic sterna with a saccular protuberance near inner side of each coxa ( Fig. 51 ). Hind wing pads vestigial. Abdominal terga I–V yellow shaded with dark brown along the anterior margin and a pair of dark brown spots medially, terga VI–VIII brown with a pair of dark brown spots medially, terga IX–X yellowish brown; mediodorsal posterior margin of metanotum and terga I–VII each with a protuberance ( Fig. 54 ). All legs without coxal gills. Gills present on terga I–VII ( Fig. 54 ). Inner margin of cerci with a few swimming bristles from apical half; median caudal filament with only one segment.

Material examined (deposited in ethanol). 10 nymphs, CHINA, Liaoning, Taizihe River, 18.v.2009, leg. Qu Xiaodong.

Distribution. China (Heilongjiang, Jilin, Liaoning), Korea, Mongolia, Russia.

Comments. Baetiella tuberculata is easily distinguished from its congeners by the distinctive color patterns of dorsum of thorax and abdominal terga. This species is mainly distributed in high latitude area of Asia, such as Russian Far East, Mongolia, Korea and northeastern China. Quan et al. (2002) reported this species from Heilongjiang Province; geographically this record represents the most northward distribution of the genus in China.

Figures

FIGURES 45 – 54. Baetiella spp. from China. (45) B. bispinosa (Gose); (46 – 47) dorsal and lateral view of B. macani (Muller- Liebenau); (48) B. marginata Braasch; (49) coxal gills of B. macani (Muller-Liebenau); (50) thoracic sterna of B. spathae n. sp.; (51) thoracic sterna of B. tuberculata (Kazlauskas); (52) head and thorax of B. marginata Braasch; (53) B. trispinata Tong & Dudgeon; (54) B. tuberculata (Kazlauskas).