Argelodes magnificus Ruta 2021, sp. nov.
Creators: name: Ruta, Rafał
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scirtidae
Argelodes
Argelodes magnificus

description: Argelodes magnificus sp. nov.
(Figs 1A–B, 2A, 3, 4A, 5)
Type material. Holotype, male (ZMUC): “ ARGENTINA, Rio Negro \ 22: Lago Nahuel Huapi \ Puerto Blest, 770 m \ 25.-27.x.1981 \ Nielsen & Karsholt”.
Diagnosis. Large (TL 9.6 mm); pronotum distinctly narrower than base of elytra; elytra subglabrous. Parameroids of penis bifid at apices, parameres wide in basal portion, narrowed and hooked in apical half.
Description. Male. Body large (TL 9.6 mm), elongate (TL/EW 2.0), widest in the middle of elytra, moderately convex. Colouration chestnut brown, head covered with relatively long and dense setae, setation of pronotum sparser, elytra with short and sparse setae, subglabrous. Head ca. 1.2× wider than long, ca. 1.9× wider than interocular space, convex, sparsely covered with weakly impressed punctation, punctures separated by 1.5–2.0× diameter of a puncture, area between punctures microreticulate, covered with regular, polygonal microsculpture; eyes large, strongly protuberant. Pronotum transverse, narrow (PL 1.6 mm, PW 2.7 mm), with punctation and microsculpture similar to those on head. Elytra long (EL 8.3 mm), 5.2× longer than pronotum, 1.8× wider than pronotum; punctation irregular, sparse, separated by ca. 1.0–2.0× diameter of a puncture. Aedeagus symmetrical, penis (Fig. 5A) large (L 1.53 mm, W 0.53 mm), dorsoventrally flattened; trigonium bifid, each process of trigonium with two denticles at apex, a lateral one and an apical one; parameroids moderately wide, bifid in apical portions, longer than trigonium, outer apical process subtriangular, inner apical process longer than outer one, narrower, digitiform and subtly sinuate. Tegmen (Fig. 5B) large (L 1.40 mm, W 0.80 mm), with semicircular basal portion; parameres wide at bases, with subparallel sides, narrowed and hooked in apical portion, with short, sparse setae. Sternite VIII (Fig. 5C) (L 0.53 mm, W 0.83 mm) widely u-shaped, with sparse setation at apex; sternite IX (Fig. 5D) (L 0.73 mm, W 0.68 mm) oval, consisting of two subtriangular hemisternites, apical portion covered with setae. Tergite VIII (Fig. 5E) (L 1.17 mm, W 1.17 mm) with apodemes shorter than apical plate, apical plate subtrapezoidal, apical margin rounded, with a row of dense, short setae, and longer, sparse ones. Tergite IX (Fig. 5F) (L 1.0 mm, W 0.97 mm) with short apodemes, apical portion membranous, setation indistinct.
Measurements and ratios. TL 9.6 mm, PW 2.7 mm, PL 1.6 mm, EL 8.3 mm, EW 4.9 mm, TL/EW 2.0, PW/PL 1.7, EL/EW 1.7, EL/PL 5.2, EW/PW 1.8.
Distribution. Known only from the environs of Puerto Blest in the province Río Negro of Argentina (Fig. 23).
Etymology. Lat. magnificus —splendid, magnificent, allusion to the remarkable body shape of the new species. Gender masculine.
description: Published as part of Ruta, Rafał, 2021, Three new genera of large marsh beetles (Coleoptera: Scirtidae) from Valdivian temperate rain forests of southern South America, pp. 451-485 in Zootaxa 5048 (4) on pages 454-456, DOI: 10.11646/zootaxa.5048.4.1, http://zenodo.org/record/5556650