Rumilara paterna, Linský & Čiamporová-Zaťovičová & Laššová & Čiampor Jr, 2022

Linsky, Marek, Ciamporova-Zatovicova, Zuzana, Lassova, Kristina & Ciampor Jr, Fedor, 2022, Molecular phylogeny of the riffle beetle genus Hexanchorus revealed a presence of a new genus (Coleoptera: Elmidae), Arthropod Systematics & amp; Phylogeny 80, pp. 575-602 : 575

3.2.6. Rumilara paterna sp. nov.

Figs 2d , 3d , 5d , 6d , 7d , 8d , 9d , 14

Material examined.

Type material: Holotype ♂ (PUCE) " Ecuador, Morona-Santiago prov., Indanza env.,, 03°08′38.2″ S, 78°32′10.5″ W, 1299m a.s.l., 24.8.2013, stream ca 5m wide, with gravel, boulders, leaf debris, submerged wood, Čiampor Jr & Čiamporová-Zaťovičová lgt." ; Paratype 1 ex (CCB) " Ecuador, Morona-Santiago prov., Santa Rosa de Mamanguy env., Cascada la Encanada , 03°05′14.7″ S, 78°24′36.0″ W, 698m a.s.l., 25.8.2013, stream ca 2-3m wide under waterfall, with clay, gravel, stones, submerged wood, Čiampor Jr & Čiamporová-Zaťovičová lgt." Other material: 1 larva " Ecuador, Napo prov., road to Coca, 00°43′39.6″ S, 77°45′56.1″ W, 1129m a.s.l., 17.8.2013, small waterfall, Čiampor Jr & Čiamporová-Zaťovičová lgt." ; 2 larvae " Ecuador, Morona-Santiago prov., tributary of Rio Crusado , 03°02′57.0″ S, 78°30′03.2″ W, 979m a.s.l., 24.8.2013, stream ca 2m wide, in forest, with gravel, stones, leaf debris, submerged wood with moss, Čiampor Jr & Čiamporová-Zaťovičová lgt." ; 1 larva " Ecuador, Morona-Santiago prov., Santa Rosa de Mamanguy env., Cascada la Encanada , 03°05′14.7″ S, 78°24′36.0″ W, 698m a.s.l., 25.8.2013, stream ca 2-3m wide under waterfall, with clay, gravel, stones, submerged wood, Čiampor Jr & Čiamporová-Zaťovičová lgt." .

Adult diagnosis.

The species can be distinguished by a combination of following characters: 1) head and clypeus fully clothed by pubescence; 2) femora fully pubescent; 3) elytra with dense pubescence, not arranged in stripes; 4) aedeagus with rod-like sclerite; 5) parameres moderately asymmetrical.

Adult diagnostic description.

Male. Colour: Body (Figs 2d , 3d ) dark brown; coxae, trochanters, femora, tibiae, and tarsi brown; tarsal claws pale brown with reddish tincture. Pubescence: Head and clypeus fully clothed with short, prone pubescence, most densely set behind eyes, and with numerous slightly longer, curved, semi-erect, hair-like setae. Pronotum (Fig. 6d ) covered by a short, moderately dense, prone pubescence, and with moderately long, curved, semi-erect, hair-like setae. Elytra with densely arranged, short, recumbent pubescence, and numerous moderately long, curved, semi-erect, hair-like setae. Femora, pro- and metatibiae densely covered with moderately long, recumbent, hair-like setae; mesotibiae with pubescence only at extreme base. Metaventrite densely clothed with short, prone pubescence. Surface: Head and clypeus sparsely microreticulate, concealed by pubescence. Pronotum densely punctate, partly concealed by pubescence. Elytra with rows of punctures shallowly impressed; intervals nearly flat. Prosternal process (Fig. 7d ) subparallel between procoxae, then subtriangular with rounded apex. Aedeagus (Figs 14a-c ) with long, dorsal, rod-like sclerite on penis; parameres asymmetrical, left one slightly longer. - Female unknown.

Measurements.

♂ - CL: 2.67 mm; PL: 0.61 mm; PW: 0.75 mm; EL: 2.07 mm; EW: 0.83 mm.

Variation.

No significant differences were observed between the two known specimens.

Etymology.

From Latin paternus (of or connected with one’s forefathers, ancestral) due to its similarity with the genus Hexanchorus .

Larva

(Fig. 9d ) with length 3.48-3.55 mm, greatest width 0.99-1.10 mm. Pleurites on abdominal segments 1-5. Abdominal segments 1-7 explanate. Surface around the frontal pair of pronotal gibbosities paler than the rest of pronotum. Tergum of abdominal segments 1-7 with a pair of distinct, longitudinally arranged small gibbosities.

Distribution.

Known from one locality in Napo Province and three localities in Morona-Santiago Province (Figs 16e-f ).

Remarks.

Only two specimens are known, one of them of unidentified sex, with abdomen lacking last two segments.

Figures

Figure 2. Dorsal habiti of Rumilara gen. nov. species: a R. obscura sp. nov. male holotype; b R. suppressa sp. nov. male holotype; c R. riberai sp. nov. male holotype; d R. paterna sp. nov. male holotype; e R. leleupi comb. nov. male holotype. Scale: 0.5 mm.

Figure 3. Lateral habiti of Rumilara gen. nov. species. a R. obscura sp. nov. male holotype; b R. suppressa sp. nov. male holotype; c R. riberai sp. nov. male holotype; d R. paterna sp. nov. male holotype; e R. leleupi comb. nov. male holotype. Scale: 0.5 mm.

Figure 5. Antennae of Rumilara gen. nov. and Hexanchorus: a R. obscura sp. nov.; b R. suppressa sp. nov.; c R. riberai sp. nov.; d R. paterna sp. nov.; e R. leleupi comb. nov.; f H. mcdiarmidi; g H. virilis; h H. shannoni; i H. angeli; j H. rostratus; k H. cordillierae; l H. onorei; m H. tarsalis; n H. usitatus; o H. gracilipes; p H. caraibus; q H. crinitus; r H. dimorphus; s H. emarginatus; t H. browni. (a, k based on dissected antennae; b-j, l-r based on photographs, not to scale, setae omitted).

Figure 6. Pronota of Rumilara gen. nov. species: a R. obscura sp. nov. male holotype; b R. suppressa sp. nov. male holotype; c R. riberai sp. nov. male holotype; d R. paterna sp. nov. male holotype; e R. leleupi comb. nov. male holotype. Scale: 0.2 mm.

Figure 7. Ventral habiti of Rumilara gen. nov. species: a R. obscura sp. nov. male paratype; b R. suppressa sp. nov. male paratype; c R. riberai sp. nov. female paratype; d R. paterna sp. nov. paratype; e R. leleupi comb. nov. male holotype. Scale: 0.5 mm.

Figure 8. Abdomens of Rumilara gen. nov. species: a R. obscura sp. nov. male holotype; b R. suppressa sp. nov. male holotype; c R. riberai sp. nov. male holotype; d R. paterna sp. nov. male holotype; e R. leleupi comb. nov. male holotype. 0.2 mm.

Figure 9. Larvae of Rumilara gen. nov. species: a R. obscura sp. nov., dorsal; b R. suppressa sp. nov., dorsal; c R. riberai sp. nov., dorsal; d R. paterna sp. nov., dorsal; e R. obscura sp. nov., ventral; f R. suppressa sp. nov., ventral. Scale: 1 mm.

Figure 14. Rumilara paterna sp. nov.: a aedeagus, left lateral view; b aedeagus, ventral view; c aedeagus, right lateral view; d male sternite VIII. Scale: 0.1 mm.

Figure 16. Sampling sites of Rumilara gen. nov. in Ecuador: a Cotopaxi prov., Otonga env., Rio Esmeralda; b Cotopaxi prov., Artos env., stream above confluence with Rio Esmeralda; c Santo Domingo de los Tsachilas prov., Otongachi env., tributary of Rio Toachi; d Santo Domingo de los Tsachilas prov., thin water layer on rock, Otongachi env.; e Morona-Santiago prov., small stream near Indanza; f Morona-Santiago prov., Santa Rosa de Mamanguy env., Cascada la Encanada; g fast-flowing stream in Napo prov.; h Morona-Santiago prov., tributary of Rio Tinajillas; i Morona-Santiago prov., tributary of Rio Tinajillas; (localities of R. obscura - a, b; R. riberai - c, d; R. paterna - e, f; R. suppressa - g - i).