Nomuraelmis amamiensis M. Satô 1964

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 : 473

Nomuraelmis amamiensis M. Satô 1964

( Figs 4 G–L, 15)

Materials examined. JAPAN: Kagoshima Prefecture: Amami-Ôshima Is.: 1 ex. (in 70% ethanol), Kinsakubaru , 26.iii.1997, H. Yoshitomi leg. ; 1 ex. (dried), Toguci, Tatsugô-chô , 21.xii.1999, H. Moriya leg. ; Okinawa Prefecture: Okinawajima Is.: 1 ex. (dried), Oku, Kunigami-son, H. Moriya leg.; 2 exs. (in 60% ethanol), Okugawa-sairyû, Oku, Kunigami-son, 26.vii.2015, YK leg.; 1 ex. (in 60% ethanol) and 1 ex. (dried with an ultrathin coating of gold), Genka-ôkawa-shiryû, Genka, Nago-shi, 24.vii.2015, YK leg.; 2 exs., (in 60% ethanol), ditto, 25.vii.2015, YK 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 yellowish brown. Dorsal and ventral surfaces entirely not smooth.

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

Thorax not serrated on sides; dorsal surface not smooth with brush-like setae. Prothorax longer than width, 2.5 times as long as mesothorax; with three ventral sclerites, procoxae closed posteriorly; scale-like setae on hind margins. Meso- and metathorax transverse; metathorax longer than mesothorax. Mesothorax with five ventral sclerites.

Abdomen 9-segmented; segments I–VIII transverse, dorsum not smooth with minute spines; pleural sclerites on segments I–VII; tergal sutures on dorso-lateral area lacking. Last segment (segment IX) longer than wide, robust in base, narrowing to apex, without longitudinal ridge, apex with a pair of very small spines; dorsal and ventral surfaces not 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 reported by Yoshitomi (2006).

Distribution. Ryukyus: Amami-Ôshima Is. (type locality), Okinawajima Is., Tokashikijima Is.

Bibliography. Yoshitomi (2006: fig. 2A–B).

Figures

FIGURE 4. Larvae of Ordobrevia and Nomuraelmis of Japan. A – F, O. amamiensis (Nomura) (A – C, immature larva from Amami-Ôshima Is.; D – F, mature larva from Iriomotejima Is.); G – L, N. amamiensis M. Satô (G – I, mature larva from Amami- Ôshima Is.; J – L, immature larva from Okinawajima Is.).