Mucronotus valdivianus, Ruta, 2021

Ruta, Rafał, 2021, Three new genera of large marsh beetles (Coleoptera: Scirtidae) from Valdivian temperate rain forests of southern South America, Zootaxa 5048 (4), pp. 451-485 : 474-476

Mucronotus valdivianus sp. nov. (Chiloe)

( Figs 10F–G , 13E , 19–20 )

Type material. Holotype, male ( DBET): “ CHILE W, Reg. X \ Chiloe Isl. SE, 20 km \ NNW of Quellon \ 216 m, 42.58, 73.45 \ 31.1.2005, Snižek lgt.” . Paratypes (97 exx. in total). 5 exx. ( CMNC): “ CHILE: Chiloe Isl. \ 8km S Ancud \ 1.II.85, S&J Peck \ forest remnant litter”. 4 exx. ( CMNC): “ CHILE: Osorno: Puyehue \ Nat. Pk; Aquas Calientes \ 18.XII.84-8.II.85 \ S&J Peck, 600m, malaise \ Nothofagus forest”. 1 ex. ( CMNC): “ CHILE: Osorno: Puyehue \ N. P.; Aguas Calientes \ 20.XII.84, S&J Peck \ 500 m, sifted forest \ stick litter, Pionero Tr.”. 1 ex. ( CMNC): “ CHILE: Osorno: Puyehue \ N. P.; Aguas Calientes \ 20.XII.84-8.II.85 \ S&J Peck, 500 m, FIT \ Derumbes Forest Trail”. 1 ex. ( CMNC): “ CHILE: Osorno: Puyehue \ Nat. Park, Antillanca Rd. \ 18-20.XII.84, S&J Peck \ 500-1000 m, carnetting”. 1 ex. ( CMNC): “ CHILE: Lago Chapo \ 34 km E Pto. Montt \ 24.XII.84-2.II.85 \ S&J Peck, 300m, FIT \ 2nd growth Nothofagus ”. 2 exx. ( CMNH): „Prov. AYSEN \ 10Km. N. Pto. Ibanez \ 14.17 Enero 1961 \ Coll: L. E. Pena”; „ CHILE ”. 31 exx. ( DBET): same data as holotype. 2 exx. ( DBET): “ CHILE W, Reg. X \ Fresia, WWN of Parga \ 480 m 27.I.2005 \ M. Snižek lgt.”. 3 exx. ( DBET): “ CHILE W, Reg. X \ Purrangue 600 m \ W of Hueyusca \ 26 I 2005, \ M. Snižek”. 5 exx. ( DBET): “ CHILE W Reg. X \ W of Los Muermos \ 1-2 km E Oc. Pacifico \ 160 m 41.20, 73.49 \ 28 I 05, leg. M. Snižek”. 1 ex. ( DBET): “ CHILE W, Reg. X \ NC Chiloe, 20 km \ NNE Castro, Inia env. \ 180 m 42.15.72 73.40.50 \ 31.I.2005 Snižek lgt.”. 1 ex. ( DBET): „ CHILE —reg. X, 50kmSW \ Los Muermos, 30.1.2005 \ 41°30.0’S, 73°35.7’ W \ leg. M. Halada, 150m ”. 4 exx. ( DBET): “ CHILE W, Reg. X \ NW Chiloe, SW of \ Aneud 250 m \ 4.11.2005 Snižek lgt.”. 1 ex. ( DBET): “ CHILE — Isla de Chiloe \ W of Castro, 9.2.2005 \ 42°20’S, 73°48’ W \ leg. M. Halada 200m ”. 1 male ( EMEC): “62- CHILE X REGION \ Chaihuin, Hueicolla Way Fog- \ ging 12:42 PM, 12.I.2007 107m \ 18°C, S39°59.926 / W73°38.976 \ Nothofagus dombeyi 20 m \ Arias et al UC Berkeley”; “ Scirtidae \ Genero sp. 1 \ det. G. Arriagada 2007”. 1 male ( EMEC): “42° 36’50.3’’S/74°06’14.7’’ \ CHILE, X Region, Chiloe Nat. Pk. \ under logs/rocks, 20:i:2002 \ Colls. K. Will, S. Lew”; “ Cyphon \ sp. \ det.: J. E. Barriga”; “U. C. Berkeley \ EMEC 107098”. 2 males ( EMEC): “66.- Chile X Region, Chaihuin \ Res. Costera Valdiviana_ 362m \ Las Garzas Way Fogging 1:27 AM \ 12/I/2007 17°C Nothofagus nitida \ S39°59.700 / W73°34.663 \ Arias et al Berkeley”; “ Elodes \ rouselii \ Solier 1849 \ det. J. E. Barriga-Tuñon 2008”; “UC Berkeley \ EMEC 118524”. 1 male ( EMEC): “70.- Chile X Region, Chaihuin \ Res. Costera Valdiviana \ Fogging 11:44 AM 14/I/2007. \ 191m 21°C Nothofagus nitida \ 35m S39°59.986 / W73°38.971 \ Arias et al Berkeley”; “ Elodes \ rouselii \ Solier 1849 \ det. J. E. Barriga-Tuñon 2008”; “UC Berkeley \ EMEC 118160”. 3 exx. ( 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”. 1 ex. ( EMEC): “61- CHILE X REGION \ Chaihiun Hueicolla Way, Fogging \ 12:23 PM, 12.I. 2007, 107 m, 18° CS \ 39°51.926/ W73°38.976 \ Nothofagus dombeyi 20 m \ Arias et al UC Berkeley”; “ Scirtidae \ Genero sp. 1 \ det. G. Arriagada 2007”. 3 exx. ( EMEC): “67- CHILE X REGION \ Chaihuin Reserva Costera Valdivi- \ ana, Las Garzas Way, Fogging \ 15:27 PM, 13.I. 2007, 357m 17°C, \ S39°59.669 / W73°34.721, Nothofagus \ dombeyi 35m, Arias et al UC Berkeley”; “ Scirtidae \ Genero sp. 1 \ det. G. Arriagada 2007”. 1 ex. ( EUM): “ CHILI, Prov. Valdivia, \ Pargue Oncol, Sendero \ Calfuco 17.I.2007 \ T. Cekalovic leg TC-831”. 1 ex. ( EUM): “ CHILI, Prov. Valdivia, \ Pargue Oncol, 700 m, \ 14.I.2001 T. \ Cekalovic leg. TC-647”. 1 ex. ( EUM): “Prov. Llanquinve, \ Chinquihve Alto, \ 12.I.1990 \ T. Cekalovic leg.”. 1 ex. ( FMNH): “ LLANQUIHUE \ Hornohuinco \ Lag. Chapo”, “ Dec. 1968 \ L. E. Peña”, “FMNH, 1986 \ L. Peña Coll. \ Acc. #17.422”. 1 ex. ( FMNH): “Pto Cisnes \ Aysen II-1961 \ Coll. L. E. Pena”, “FMNH, 1986 \ L. Peña Coll. \ Acc. #17.422”. 1 ex. ( MHNG): “ CHILE: X Reg. Prov. Osorno \ PN Puyehue, Aguas \ Calientes, 400-500 m \ 31.XII.1990 - 1.I.1991 \ Agosti & Burckhardt #25b”. 2 exx. ( MHNG): “ CHILE: X Reg. Prov. Chiloé \ Cucao, 30 km SW Castro \ PN Chiloé, 30 m, temp. rain \ forest, 4-6.I.1991 \ Agosti & Burckhardt #29a”. 1 ex. ( NHM): “ CHILE: \ Laguna San Rafael \ Feb-March 1999”; “Base Camp \ 46°44’44’’ S \ 73°56’34’’ W”; “Moss from \ tree”; “BM-1999-107 \ P. M. Hammond \ K. A. Jackson”. 1 ex. ( NHM): “ CHILE: \ Laguna San Rafael \ Feb-March 1999”; “Base Camp \ 46°44’44’’ S \ 73°56’34’’ W”; “LEAF LITTER”; “BM- 1999-107 \ P. M. Hammond \ K. A. Jackson”. 2 exx. ( NHM): “ CHILE: \ Laguna San Rafael \ Feb-March 1999”; “Base Camp \ 46°44’44’’ S \ 73°56’34’’ W”; “Forest Litter”; “BM-1999-107 \ P. M. Hammond \ K. A. Jackson”. 1 ex. ( NHM): “19 CHILE X Reg. \ PN Puyehue \ Anticura \ I.Ribera leg. 31.I.1999 ”; “BM 1999-195 \ 19.i.-9.ii.1999 \ I. Ribera”. 1 ex. ( NHM): “49685”; “ex Mus \ Murray”; “ Chili ”; “Fry Coll. / 1905-100.”. 1 ex. ( NHM): “ CHILE: \ Laguna San Rafael \ Feb-March 1999”; “Malaise \ Trap 2”; “BM-1999-107 \ P. M. Hammond \ K. A. Jackson”. 2 exx. ( 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” [1 specimen with additional label “? gen. n. 1 \ sp. 1 \ P. M. Hammond det.”. 1 ex. ( NHM): “ CHILE: \ Laguna San Rafael \ Feb-March 1999”; “Base Camp \ 46°44’44’’ S \ 73°56’34’’ W”; “Moss from \ ground”; “BM-1999-107 \ P. M. Hammond \ K. A. Jackson”. 1 ex. ( NHM): “ CHILE: \ Laguna San Rafael \ Feb-March 1999”; “BM-1999-107 \ P. M. Hammond \ K. A. Jackson”. 1 ex. ( NHMF): „ CHILE, prov. Valdivia, \ Chaihuín, Camino a \ Huaicolla, 12 ene 2007, \ 107mt, 39°59.926 S 73° \ 38.976W, fogging s/ \ Nothofagus dombeyi , \ leg. J. E. Barriga-Tuñón”. 1 ex. ( SEMC): “ CHILE: Osorno \ 14.5 km W Puaucho \ 40°37’S, 73°45’W, 175m \ 11-28 Nov 1994. R. Les- \ chen & C. Carlton #170 \ ex flight intercept trap”.

Diagnosis. Posterolateral angles of pronotum well marked; elytra covered with dense but small punctures; processes of trigonium shorter than pala, curved, distinctly widened at apices, with ca. 20 denticles on its outer margin and 6 denticles on inner margin; anterior portion of bursal sclerite subtrapezoidal.

Description. Male. Body moderately large (TL 6.2–8.3 mm), elongate (TL/EW 1.7–1.9), widest in the middle of elytra, moderately convex. Colouration chestnut brown. Head ca. 1.6× wider than interocular space, convex, densely covered with strong granulate punctation, punctures separated by ca. 0.2–0.3× diameter of a puncture; eyes moderately large, protuberant. Pronotum transverse (PW/PL 1.9–2.4), punctation on disc not granulate, sparse, punctures separated by ca. 2.0× diameter of a puncture, punctation on sides dense, granulate, similar to that on head, lateral carinae of pronotum almost straight, posterolateral angles well marked, anterolateral angles long, subtriangular. Elytra long, 4.0–5.0× longer than pronotum, 1.4–1.5× wider than pronotum; punctation irregular, dense, punctures small, separated by ca. the diameter of a puncture. Aedeagus symmetrical, penis ( Fig. 19A ) large (L 1.40 mm, W 0.57 mm), dorsoventrally flattened; trigonium bifid, each process of trigonium curved widened in apical portion, outer margin with ca. 20 denticles and ca. 6 denticles on inner margin of widened apical portion; parameroids subtriangular, with relatively wide apical portion, apices slightly longer than processes of trigonium. Tegmen ( Fig. 19B ) large (L 1.40 mm, W 0.97 mm), subrectangular, with small, subtriangular lateral processes; ventral processes wide, each with two subtriangular lobes; parameres digitiform, without setation. Sternite VIII ( Fig. 19C ) (L 0.60 mm, W 0.83 mm) widely v-shaped, with sparse setation at apex; sternite IX ( Fig. 19D ) (L 0.80 mm, W 0.90 mm) oval, consisting of two subtriangular hemisternites, apical portion covered with setae. Tergite VIII ( Fig. 19E ) large (L 1.1 mm, W 1.07 mm), apodemes shorter than apical plate, apical plate subtrapezoidal, apical margin rounded, with a row of sparse setae. Tergite IX ( Fig. 19F ) (L 0.80 mm, W 0.73 mm) with short apodemes, apical portion membranous, setation indistinct.

Female. Body slightly smaller (TL TL 5.40–7.40 mm), setation of dorsum dense, recumbent; head with coarse punctures separated by ca. 0.2–0.3× diameter of a puncture; disc of pronotum more convex than in males; pronotal disc densely covered with small, not granulate punctures, lateral sides of pronotum with coarse, granulate punctures separated by ca. 0.2× diameter of a puncture; punctures on elytra separated by ca. 1.0–1.5× diameter of a puncture; ovipositor long (L 4.2 mm, Fig. 20A ), without branchlets, coxites subtriangular, elongated, apices of coxites with numerous short setae, styli apical, with two single patches of sensillae, bursal sclerite (L 2.1 mm, W 0.8 mm) elongate, with subtrapezoidal sclerotization in anterior portion ( Fig. 20B ).

Measurements and ratios. Males (n = 10) TL 6.20–8.30 mm (7.2 mm), PL 1.20–1.55 mm (1.34 mm), PW 2.50–3.00 mm (2.8 mm), EL 5.00– 6.90 mm (5.9 mm), EW 3.70–4.50 mm (4.0 mm), TL/EW 1.7–1.9 (1.8), PW/PL 1.9–2.4 (2.2), EL/EW 1.3–1.6 (1.5), EL/PL 4.0–5.0 (4.6), EW/PW 1.4–1.5 (1.4). Females (n = 10) TL 5.40–7.40 mm (6.6 mm), PL 1.00– 1.50 mm (1.3 mm), PW 2.10–3.10 mm (2.7 mm), EL 4.30–5.90 mm (5.4 mm), EW 2.90–4.20 mm (3.7 mm), TL/EW 1.7–1.9 (1.7), PW/PL 2.0–2.3 (2.1), EL/EW 1.3–1.5 (1.4), EL/PL 3.7–4.6 (3.9), EW/PW 1.3–1.4 (1.4).

Distribution. Species known from numerous localities scattered in the Chilean regions Los Ríos, Los Lagos, and Aysén ( Fig. 24C ).

Biology. Most specimens were collected in Valdivian temperate forests which included Nothofagus dombeyi and N. nitida .

Etymology. After Valdivia, a region where the species occurs.

Figures

FIGURE 10. Mucronotus gen. nov., dorsal view. A) M. enigmaticus sp. nov., male; B) M. enigmaticus, female; C) M. pat- agonicus sp. nov., male; D) M. schwabei (Pic), male; E) M. schwabei (Pic), female; F) M. valdivianus sp. nov., male; G) M. valdivianus sp. nov., female; H) M. velutina (Solier), male; I) M. velutina (Solier), female. Scale bar = 2.0 mm

FIGURE 13. Mucronotus gen. nov., pronotum. A) M. enigmaticus sp. nov., male; B) M. enigmaticus sp. nov., female; C) M. patagonicus sp. nov., male, D) M. schwabei (Pic), male, E) M. valdivianus sp. nov., male, F) M. velutinus (Solier), male.

FIGURE 19. Mucronotus valdivianus sp. nov., male. A) penis; B) tegmen; C) sternite VIII, D) sternite IX; E) tergite VIII; F) tergite IX. Scale bar = 0.5 mm.

FIGURE 20. Mucronotus valdivianus sp. nov., female. A) genital tract; B) bursal sclerite. Abbreviations: bscl—bursal sclerite, bsl—bursella, gla—gland. Scale bars = 1.0 mm (A), 0.5 mm (B).

FIGURE 24. Distribution of Mucronotus gen. nov. A) M. enigmaticus sp. nov. (blue dots) and M. patagonicus sp. nov. (red dots); B) M. schwabei (Pic); C) M. valdivianus sp. nov.; D) M. velutinus (Solier).