Dyscolus rivinus Moret, 2020

Moret, Pierre & Murienne, Jérôme, 2020, Integrative taxonomy of the genus Dyscolus (Coleoptera, Carabidae, Platynini) in Ecuadorian Andes, European Journal of Taxonomy 646, pp. 1-55 : 16-18

Dyscolus rivinus Moret sp. nov.

urn:lsid:zoobank.org:act:95AF0791-2EC1-42FD-862D-02F7BCFB1419

Figs 11–12

Etymology

Latin adjective meaning ‘riparian’.

Type material

Holotype

ECUADOR • ♂; Cotopaxi Province, Otonga ; 2000 m a.s.l.; 7 Jul. 1998; I. Tapia leg.; QCAZ.

Paratypes (3 ♂♂)

ECUADOR – Cotopaxi Province • 1 ♂; same collection data as for holotype; QCAZ • 2 ♂♂; Otonga ; 1950 m a.s.l.; 3–5 Jul. 2001; P. Moret leg.; berge de ruisseau; CPM .

Diagnostic escription

Wingless. Body length: 10.0– 11.7 mm. Very similar externally to D. incommunis Moret sp. nov., from which it differs in the following features. Base of the pronotum narrower, lateral margins less expanded near base, hind angles more obtuse and more rounded. Apex of elytra ended with a small but protruding and acute tooth, preceded externally by a short sinuation ( Fig. 11 ). Fourth metatarsomere without subapical setae. Male genitalia ( Fig. 12 ) with apex of the median lobe shorter, less acute, not sinuate in lateral view, endophallus unarmed, without a dense squamose area near apex, at most with a single feebly sclerotized squama. Female genitalia unknown.

Comparisons

Closely related to D. incommunis Moret sp. nov., from which it can be distinguished by a few but constant characters, especially the rounded hind angles of the pronotum, the apical tooth of the elytra and the unarmed endophallus.

Habitat

Riparian in the montane forest on the Western slope of the Andes , at around 1900–2000 m a.s.l. This hygrophile specialisation differs from the more mesic habitat of D. incommunis Moret sp. nov.

Geographic distribution

Southern end of the Chocó biogeographic region in northwestern Ecuador, 75 km south of the type locality of D. incommunis Moret sp. nov. Probably microendemic.

Figures

Figs 7–12. 7–8. Dyscolus aquator Moret sp. nov. 7. Habitus of the male holotype (QCAZ). 8. Aedeagus, median lobe in lateral view. 9–10. D. incommunis Moret sp. nov. 9. Aedeagus, median lobe in lateral view. 10. Habitus of the male holotype (QCAZ). 11–12. D. rivinus Moret sp. nov. 11. Apex of the elytra. 12. Aedeagus, median lobe in lateral view.