Ordobrevia gotoi Nomura, 1959

Hayashi, Masakazu, Kamite, Yuuki, Kobayashi, Takuya & Sota, Teiji, 2016, Description of larvae of genera Stenelmis, Ordobrevia and Nomuraelmis (Coleoptera: Elmidae: Elminae) of Japan with their molecular taxonomy, Zootaxa 4178 (4), pp. 451-480 : 467

Ordobrevia gotoi Nomura, 1959

( Figs 3 G–H, 11)

Material examined. JAPAN: Shimane Prefecture: 1 ex. (dried), Tanbedani-kawa (river), Bessyo , Sada-chô , Izumo-shi , 5.viii.2008, MH leg.; 1 ex. (dried), Susa-gawa (river), Miyauchi, Sada-chô, Izumo-shi , 5.viii.2008, MH leg.; 4 exs. (dried with an ultrathin coating of gold), Yoshino-gawa (river), Asahitatara, Sada-chô, 2.viii.2008, MH leg.; 1 ex. (dried with an ultrathin coating of gold), Yoshinokami, Sada-chô, 4.viii.2015, MH leg.

Description. Body elongate, gradually narrowing from middle to apex; convex dorsally and flattened ventrally; slightly prominent spiracles on mesothorax and abdominal segments I–VIII. Color of body and appendages orange. Dorsal and ventral surfaces entirely smooth, dorsum with long simple setae.

Head visible from above, well exposed from prothorax, as wide as long; clypeus transverse, with setae on front; a pair of spines on both sides of clypeus; vertex smooth with brush-like setae.

Thorax not serrated on sides; dorsum entirely smooth with simple setae. Remarkable scale-like setae on hind margin on each segment. Prothorax longer than width, 2.2 times as long as mesothorax; with 3 ventral sclerites, procoxae closed posteriorly; branched setae on hind margins. Meso- and metathorax transverse; metathorax longer than mesothorax. Mesothorax with five ventral sclerites.

Abdomen 9-segmented; segments I–VIII transverse, dorsal surface entirely smooth with simple setae; pleural sclerites on segments I–VII; tergal sutures on dorso-lateral area lacking. Remarkable scale-like setae on hind margin of segments I–VIII. Tooth on lateral hind margin of segments I–VIII. Last segment (segment IX) longer than wide, gradually narrowing to apex, without longitudinal ridge, apex with a pair of spines; dorsal surface smooth; ventral operculum, opercular claws, and anal gills present.

Habitat. Middle to lower stream reaches; larvae live in the gravel substrate.

Identification. The larva was identified by mitochondrial DNA sequences ( Hayashi & Sota, 2010).

Distribution. Hokkaido, Honshu, Shikoku, Kyushu, Syodoshima Is., Mikurajima Is., Tsushima Is., Yakushima Is.

Bibliography. Hayashi & Sota (2010).

Figures

FIGURE 3. Larvae of Stenelmis and Ordobrevia of Japan. A – C, S. aritai M. Satô; D – F, S. hayashii M. Satô; G – H, O. gotoi Nomura; I – J, O. maculata (Nomura); K – M, O. foveicollis (Schönfeldt). A, D, G, I, K, dorsal view; B, E, H, J, L, lateral view; C, F, M, ventral view. Scale bars: 1.0 mm.