Ordobrevia maculata (Nomura, 1957)

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 : 467-470

Ordobrevia maculata (Nomura, 1957)

( Figs 3 I–J, 12)

Materials examined. JAPAN: Shimane Prefecture: 1 ex. (dried: 3 exs. with an ultrathin coating of gold), Inudani-gawa (river), Nishihayashigi-chô , Izumo-shi , 19.x.2014, MH leg.; 1 ex. (dried with an ultrathin coating of gold), Inudani-gawa (river), Nishihayashigi-chô, Izumo-shi , 15.xi. 2 0 15, 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. Body color entirely orange, and appendages orange. Dorsal and ventral surfaces entirely smooth, dorsum with long simple setae and long brush-like setae.

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

Thorax not serrated on sides; dorsum entirely smooth with long brush-like setae. 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 brush-like setae; pleural sclerites on segments I–VII. Brush-like setae on hind margin of segments I–VIII. Three to five teeth on lateral hind margin of segments I–VIII; tergal sutures on dorso-lateral area lacking. 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. Headwaters to upper 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 , Oki Iss. (Dogo Is.), Yakushima Is. Bibliography. Hayashi & Sota (2010: fig. 2).

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.