Stonefly Species Remenus bilobatus (Lash Springflies)

Source: Holomorphology And Systematics Of The Eastern Nearctic Stonefly Genus Remenus Ricker (Plecoptera: Perlodidae)

(Figs. 3 – 18, 20 – 40) http: // lsid. speciesfile. org / urn: lsid: Plecoptera. speciesfile. org: TaxonName: 608Source: Holomorphology And Systematics Of The Eastern Nearctic Stonefly Genus Remenus Ricker (Plecoptera: Perlodidae)

Male. (Fig 20). Macropterous; forewing length 10.0 – 11.0 mm (n = 10) (Fig. 21). Body length 8.1 – 10.6 mm (n = 10). General body color yellow-gold with light brown markings. Dorsum of head typical of genus (Fig. 22). Pronotum light brown, covered in regularly spaced setae, with pale, glabrous rugosities mediolaterally (Fig. 22); medial pale area widest posteriorly (Fig. 22). Abdominal terga uniformly yellow-gold (Fig. 23). Tergum 8 with mediolateral patches of <10 sensilla basiconica (Fig. 23). Tergum 9 with a medial glabrous division that extends anteriorly ¾ tergum length and mediolateral patches of ~ 20 sensilla basiconica (Fig. 23). Hemitergal lobes short, separated from 10 th tergum, with long trichoid sensilla and> 20 sensilla basiconica on each lobe (Figs. 23 – 26). Epiproct length ~ 300 – 320 µm ; width ~ 80 – 84 µm (n = 3); epiproct flattened laterally (Figs. 23, 26), with a ventral keel (Figs. 24, 27 – 28), and a mediodorsal sclerite that is broadest basally and greatly exceeds the epiproct apex terminating in a thread-like lash (Figs. 23, 26 - 27); complete lash length ~ 830 µm (n = 1); keel widest at mid-length (Fig. 26), covered in dense, hair-like spinulae (Fig. 28). Paragenital plates broadly triangular (Figs. 23 – 24, 26). Basal cowl clothed in dense golden-brown spinulae (Figs. 23 – 24).

Female. Macropterous; forewing length 9.8 – 12.0 mm (n = 10). Body length 8.8 – 11.1 mm (n = 10). Body coloration and morphology similar to male. Sternum 8 with variable subgenital plate extending ~ ½ over sternum 9, or to the posterior margin of sternum 9; subgenital plate moderately sclerotized, broadly triangular (Fig. 29) or broadly rounded (Fig. 30); with regularly spaced setae; posterolateral margins convex; basolateral margins either parallel or convergent posteriorly; basolateral crease nearly straight or convex posteriorly, extending ~ 1/3 length anteriorly into sternum 8 (Figs. 29 – 30).

Ovum. Shape typical of genus (Figs. 31 – 34). Length 439 – 440 µm; width 348 – 361 µm (n = 3).

Larva. (Fig. 35). Body length 9.0 – 10.4 mm, (n = 5). Head (Fig. 36), lacinia (Fig. 37), mandibles (Fig. 38), and pronotum (Fig. 36) typical of genus. Mature male larva with an elongate terminal process with a constriction at the basal 1/3; apical 2/3 thin and tapered (Fig. 39). Mature larva with paired medial and lateral spots on the abdominal terga. Basal cercal segments with whorls of both long and short setae (Fig. 40).