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

description: Mucronotus patagonicus sp. nov.
(Figs 10C, 13C, 16)
Type material. Holotype, male (EMEC): “59- CHILE X REGION \ Oncol Park, Quitaqui Way Fog- \ ging 12:03 PM, 10.I. 2007, 526m \ 19°C, S39°42.009 / W73°18.558 \ Sexegothaea conspicua 40m \ Arias et al UC Berkeley”; “ Scirtidae \ Genero sp. 4 \ det. G. Arriagada 2007”. Paratypes (17 exx. in total, all males): 1 ex. (DBET): “ CHILE W, Reg. X \ W of Pargua \ 40 m 29.I.2005 \ M. Snižek lgt.”. 1 ex. (DBET): “ CHILE CW, reg. IX \ SE of NUEVA TOLTÉN \ BOROA CENTRAL \ 22.I.2004 \ LGT.M. SNIŽEK”. 1 ex. (EMEC): same data as holotype. 1 ex. (EMEC): “60- CHILE X REGION \ Oncol Park, Quitaqui Way Fog- \ ging 15:32 PM, 10.I. 2007, 519m \ 13°C, S39°42.071 / W73°18.547 \ Saxegothaea conspicua 45m \ Arias et al UC Berkeley”; “ Scirtidae \ Genero sp. 1 \ det. G. Arriagada 2007”. 3 exx. (EMEC): “54- CHILE X REGION \ Oncol Park, Fogging 14:36 PM \ 300cc/l, 08.I. 2007, 576m 19°C \ S39°41.973 / W73°18.917 \ Sexegothaea conspicua 40m \ Arias et al UC Berkeley”; “ Scirtidae \ Genero sp. 1 \ det. G. Arriagada 2007”. 2 exx. (EMEC): “56- CHILE X REGION \ Punta Curinanco, Fogging \ 12:44 PM, 09.I. 2007, 177m \ 17°C, S39°42.788 / W73°24.323 \ Aextoxicon punctatum 25m \ Arias et al UC Berkeley”; “ Scirtidae \ Genero sp. 1 \ det. G. Arriagada 2007”. 2 exx. (EMEC): “52- CHILE X REGION \ Oncol Park, Calfuco Way Fog- \ging 14:13 PM, 150 cc/l, 07.I.2007 \ 515m 14°C, S39°42.114 / W73° \ 19.244 Sexegothaea conspicua \ 35m, Arias et al UC Berkeley”; “ Scirtidae \ Genero sp. 1 \ det. G. Arriagada 2007”. 1 ex. (EMEC): “ CHILE, X Region Los Rios, \ Oncol Park, 5- 19.01.2007 \ Malaise trap T1 \ Arias et Ruiz UC Berkeley”; “ Scirtidae \ Genera \ sp. 1 \ det. J. E. Barriga-Tufion 2008”. 2 exx. (EUM): „CHILI, Prov. Valdivia, \ Parque Oncol, 485 m, 9 I \ 2001 T. Cekalovic leg.”. 1 ex. (EUM): “ CHILI, Prov. Valdivia, \ Parque Oncol, 485 m \ 6 I 2002 T. Cekalovic leg.”. 1 ex. (EUM): “ CHILI, Region X, N of \ Valdivia, Parque Oncol 13. \ I. 2007 WD Shepard leg.”. 1 ex. (NHM): “ CHILE: \ Laguna San Rafael \ Feb-March 1999”; “Base Camp \ 46°44’44’’ S \ 73°56’34’’ W”; “ Malaise trap \ Week 1 Beach”; “BM-1999-107 \ P. M. Hammond \ K. A. Jackson ”.
Diagnosis. Posterolateral angles of pronotum well marked; elytra covered with dense but small punctures; processes of trigonium shorter than pala, curved, with ca. 15 denticles on its outer margin, gradually narrowing till apices.
Description. Male. Body moderately large (TL 6.5–8.0 mm), elongate (TL/EW 1.7), widest in the middle of elytra, moderately convex. Colouration chestnut brown. Head ca. 1.5× wider than interocular space, convex, densely covered with strong, granulate punctation, punctures separated by 0.3–0.5× diameter of a puncture; eyes moderately large, protuberant. Pronotum transverse (PW/PL 2.0), covered with dense (separated by 0.3–0.5× diameter of a puncture) and strongly granulate punctures on sides and more sparse punctures on central portion, lateral carinae of pronotum rounded, posterolateral angles well marked, anterolateral angles subtriangular. Elytra long, ca. 4× longer than pronotum, 1.5× wider than pronotum; punctation irregular, sparse, separated by ca. the diameter of a puncture. Aedeagus symmetrical, penis (Fig. 16B) large (L 1.70 mm, W 0.67 mm), dorsoventrally flattened; trigonium bifid, each process of trigonium curved, with ca. 15 denticles on margin; parameroids subtriangular, narrowed in apical portion, as long as processes of trigonium. Tegmen (Fig. 16C – D) large (L 1.77 mm, W 1.03 mm), subrectangular, with small, subtriangular lateral processes each with two denticles at apex; ventral processes wide, each with two lobes (large subtriangular and small suboval one); parameres digitiform, without distinct setation. Sternite VIII (Fig. 16E) (L 0.70 mm, W 1.0 mm) widely v-shaped, with sparse setation at apex; sternite IX (Fig. 16F) (L 1.0 mm, W 0.80 mm) oval, consisting of two subtriangular hemisternites, apical portion covered with dense setae. Tergite VIII (Fig. 16G) (L 1.17 mm, W 1.10 mm) with apodemes shorter than apical plate, apical plate subtrapezoidal, apical margin rounded, with sparse setae. Tergite IX (Fig. 16H) (L 0.93 mm, W 0.73 mm) with short apodemes, apical portion membranous, setation indistinct.
Female. Unknown.
Measurements and ratios. Males (n = 10) TL 6.50–8.0 mm (7.46 mm), PL 1.1–1.9 mm (1.44 mm), PW 2.5–3.3 mm (2.86 mm), EL 5.5–6.6 mm (6.24 mm), EW 3.8–4.7 mm (4.83 mm), TL/EW 1.70–1.83 (1.71), PW/PL 1.74–2.27 (2.0), EL/EW 1.38–1.55 (1.42), EL/PL 3.42–5.0 (4.21), EW/PW 1.42–1.52 (1.47).
Distribution. A rare species, known from numerous collections from the Oncol Park (Los Ríos region) and two distant localities in regions Los Lagos and Aysén of Chile (Fig. 24).
Biology. Most specimens were collected in Valdivian temperate forests with predominating Aextoxicon punctatum Ruiz & Pav. and Sexegothaea conspicua.
Etymology. Referring to the area inhabited by the species—Patagonia.
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 468-470, DOI: 10.11646/zootaxa.5048.4.1, http://zenodo.org/record/5556650