Chilarboreus (Chilarboreus) fossulatus, Ruta, 2011

Ruta, Rafał, 2011, Chilarboreus gen. nov., a new genus of Chilean Scirtidae (Coleoptera: Scirtoidea), with descriptions of three new species, Journal of Natural History 45 (27 - 28), pp. 1689-1713 : 1696-1700

Chilarboreus (Chilarboreus) fossulatus sp. nov.

( Figures 1A ; 2 A–D,J; 3–6)

Type material (44 males, 2 females)

Holotype. Male ( MNNC): “52- CHILE X REGION / Oncol Park, Calfuco Way Fog- / ging 14:13 PM 150 cc / l 07.I.2007 / 515 m 14 ◦ C, S39 ◦ 42.114 / W73 ◦ 19.244, Saxegothaea conspicua / 35 m, Arias et al UC Berkeley” [printed label]; “ Scirtidae / Genero sp. 5 / det. G. Arriagada 2007” [printed label].

Paratypes. 1 male ( MNNC): same data as holotype . 1 male ( CMNC): “ Chile / Malleco; Puren ” [printed label]; “ Contulmo Natur. / Mon. 11.XII.1984 ” [printed label]; “Forest; 350 m / S & J Peck leg.” [printed label]; “- 13.II.1985 / mixed evergr.” [printed label] . 3 males ( CMNC): “ Chile / Malleco; Puren / ContulmoNatur. Mon. / 11.XII.84- 13.II.85 / S&J Peck, FIT, 350 m / mixedevergr. forest” [printed label] . 2 males, 1 female ( CMNC): “ Chile: Valdivia / 34 km WNW La Union / 17.XII.84-7.II.85 / S&JPeck, 700 m, FIT / mixed evergr. forest” [printed label] ; 1 male with additional label: “ SCIRTIDAE / N. GEN. SP. / Det. J. F. Lawrence 00” [handwritten by J. F. Lawrence and printed] . 2 males ( MNNC): “ Llancacura. / Valdivia. / Ex. Rauli. / 17-I-1966. / Col. T. Silva G.” [handwritten label] . 4 males ( MNNC): “ Llancacura. / Valdivia. / Ex. Tepa. / 11-I-1966. / Col. N. Hichins O.” [handwritten label] . 2 males ( MNNC): “66- CHILE X REGION / Chaihuin Reserva Costera Valdivi- / ana, Las Garzas Way Fogging / 11:27 AM, 13.I. 2007, 362 m 17 ◦ C, / S39 ◦ 59.700 / W73 ◦ 34.663, Nothofagus / nitida 35 m, Arias et al UC Berkeley” [printed label]; “ Scirtidae / Genero sp. 5 / det. G. Arriagada 2007” [printed label] . 2 males ( MNNC): “67- CHILE X REGION / Chaihuin Reserva Costera Valdivi- / ana, Las Garzas Way Fogging / 15:27 PM, 13.I. 2007, 357 m 17 ◦ C, / S39 ◦ 59.669 / W73 ◦ 34.721, Nothofagus / dombeyi 35 m, Arias et al UC Berkeley” [printed label]; “ Scirtidae / Genero sp. 5 / det. G. Arriagada 2007” [printed label] . 2 males ( MNNC): “54- CHILE X REGION / Oncol Park, Fogging 14:36 PM / 300 cc / l 08.I.2007 / 576 m 19 ◦ C / S39 ◦ 41.973 / W73 ◦ 18.917 / Saxegothaea conspicua 40 m / Arias et al UC Berkeley” [printed label]; “ Scirtidae / Genero sp. 5 / det. G. Arriagada 2007” [printed label] . 2 males ( MNNC): “56- CHILE X REGION / Punta Curiñanco, Fogging / 12:44 PM, 09.I. 2007, 177 m / 17 ◦ C, S39 ◦ 42.788 / W73 ◦ 24.323 / Aextoxicon punctatum 25 m / Arias et al UC Berkeley” [printed label]; “ Scirtidae / Genero sp. 5 / det. G. Arriagada 2007” [printed label] . 2 males ( MNNC): “59- CHILE X REGION / Oncol Park, Quitaui Way Fog- / ging 12:03 PM, 10.I. 2007, 526 m / 19 ◦ C, S39 ◦ 42.009 / W73 ◦ 18.558 / Saxegothaea conspicua 40 m / Arias et al UC Berkeley” [printed label]; “ Scirtidae / Genero sp. 5 / det. G. Arriagada 2007” [printed label] . 1 male ( MNNC): “60- CHILE X REGION / Oncol Park, Quitaui Way Fog- / ging 15:32 PM, 10.I. 2007, 519 m / 13 ◦ C, S39 ◦ 42.071 / W73 ◦ 18.547 / Saxegothaea conspicua 45 m / Arias et al UC Berkeley” [printed label]; “ Scirtidae / Genero sp. 5 / det. G. Arriagada 2007” [printed label] . 3 males, 1 female ( MNNC): “28- CHILE X Región / Chiloé, Chinquen , 20.I.2006 / S42 ◦ 37.111 / W74 ◦ 05.973 / Fogging: Nothofagus dom- / beyi, Arias et al. Berkeley” [printed label]; “ Scirtidae / Genero sp. 7 / det. G. Arriagada 2007” [printed label] . 5 males ( MNNC): “16- CHILE X REGION / Oncol. Site 3, 13.I.2006 / S39 ◦ 41.596 / W73 ◦ 19.110 / 496 m., Fogging: Pseudopanax / sp., Arias et al. Berkeley” [printed label]; “ Scirtidae / Genero sp. 7 / det. G. Arriagada 2007” [printed label] . 3 males ( MNNC): “12- CHILE X REGION / Oncol Park. Site 2, 12.I.2006 / S39 ◦ 41.596 / W73 ◦ 19.110 / Fogging: Mañio / Arias et al. Berkeley” [printed label]; “ Scirtidae / Genero sp. 7 / det. G. Arriagada 2007” [printed label] . 1 male ( MNNC): “15- CHILE X REGION / Oncol. Site 3, 13.I.2006 / S39 ◦ 41.596 / W73 ◦ 19.110 / 506 m., Fogging: Canelo+Luma / Arias et al. Berkeley” [printed label]; “ Scirtidae / Genero sp. 6 / det. G. Arriagada 2007” [printed label] . 1 male ( MNNC): “06- CHILE X REGION / Oncol Park , 10.I.2006, S39 ◦ 41.596 / W73 ◦ 19.110, Fogging: / Dasyphyllum diacanthoides / Arias et al. Berkeley” [printed label]; “ Scirtidae / Genero sp. 7 / det. G. Arriagada 2007” [printed label] . 1 male ( MNNC): “07- CHILE X REGION / Oncol Park , 10.I.2006, S39 ◦ 41.596 / W73 ◦ 19.110, Fogging: / Laureliopsis philippiana / Arias et al. Berkeley” [printed label]; “ Scirtidae / Genero sp. 7 / det. G. Arriagada 2007” [printed label] . 1 male ( MNNC): “09- CHILE X REGION / Oncol Park , 11.I.2006 / S39 ◦ 41.596 / W73 ◦ 19.110 / Canopy Malaise trap / Arias et al. Berkeley” [printed label]; “ Scirtidae / Genero sp. 7 / det. G. Arriagada 2007” [printed label] . 1 male ( EMEC): “ CHILE, X Region Los Rios, / Curiñanco point, 20.XII.2006 / 5.01.2007, Malaise trap T3 / Arias et Ruiz UC Berkeley” [printed label] . 3 males ( EMEC): “ CHILE, X Region Los Rios, / Oncol Park , 19.01 / 1.02.2007 / Malaise trap T2 / Arias et Ruiz UC Berkeley” [printed label] .

Diagnosis

Similar to C. acuticollis , but pronotum with deeper anterior fossae, anterior pronotal angles not marked, penis shorter, trigonium subrectangular, with truncate apex.

Description

Male. Body elongate, slightly widening in posterior portion, moderately flattened, clothed with procumbent setae. Coloration from light to dark brown, without contrasting dorsal pattern. Head as long as wide, c.1.5 times wider than interocular space, concave, covered with subtly granulate punctures; eyes small, moderately protuberant. Antennae moderately long, extending to basal third of elytra; antennomere 1 globular, subquadrate; antennomere 2 cylindrical, slightly narrower than antennomere 1; antennomere 3 long, c.1.3 times longer than antennomere 2; antennomeres 4–10 gradually shortening, triangularly widened; apical antennomere very wide, oval, as long as antennomere 3. Pronotum transversely rectangular, sides subparallel, widest at posterior angles; disc convex; sides abruptly depressed, with deep fossae in anterolateral angles; anterolateral angles right-angled, not produced. Punctation of pronotum subtly granulate on disc, distinctly granulate on sides. Basal groove well marked, ended with deep fossae. Elytral punctation irregular, relatively sparse; punctures slightly elongated, separated by c.2.0 diameters. Subfemoral grooves with distinct hexagonal microreticulation. Aedeagus relatively short (L / W = 2.1); parameroids very narrow, digitiform. Trigonium wide, subrectangular, with truncate apex. Measurements of male genitalia: aedeagus (L 0.30, W 0.14); sternite 9 (L 0.16, W 0.19); tergite 8 (L 0.33, W 0.20); tergite 9 (L 0.28, W 0.17).

Female. Head 1.4 times wider than interocular space. Body elongate oval, widest in the middle if its length. Pronotum with well-developed basal groove and longitudinal groove ranging from elytral bases to mid length of pronotum. Humeri not marked; hind wings reduced. Measurements of female genitalia: sternite 8 (L 0.57, W 0.17), tergite 8 (L 0.92, W 0.24), ovipositor (L 1.30), prehensor (L 0.35, W 0.20).

Variation

Total length of body only slightly variable.

Measurements and ratios

Males (n = 10). TL 2.10–2.37 (2.20), PL 0.37–0.53 (0.41), PW 0.50–0.60 (0.56), EL 1.72–1.90 (1.79), EW 0.97–1.07 (1.03), TL / EW 2.1–2.3 (2.1), PW / PL 1.3–1.5 (1.4), EL / EW 1.7–1.8 (1.7), EL / PL 4.2–4.8 (4.5).

Female (n = 1). TL 2.10, PL 0.40, PW 0.67, EL 1.70, EW 0.90, TL / EW 2.3, PW / PL 1.7, EL / EW 1.9, EL / PL 4.3.

Distribution

Purén / Contulmo, Provincia de Malleco , Región de La Araucanía ; Oncol, 34 km La Unión, Llancacura, Chaihuín, Curiñanco , Provincia de Valdivia , Región de Los Ríos ; Chinquén, Provincia de Chiloé , Región de los Lagos .

Etymology

Latin fossa – depression, cavity; refering to deep depressions in the anterolateral portions of pronotum.

Figures

Figure 1. Habitus. (A) Chilarboreus (Chilarboreus) fossulatus; (B) Chilarboreus (Chilarboreus) acuticollis; (C) Chilarboreus (Pictarboreus) darwini. Scale bar 1.0 mm.

Figure 2. Morphological details. (A–D, J) Chilarboreus (Chilarboreus) fossulatus; (E–I, K) Chilarboreus (Pictarboreus) darwini; (A, E) mandible; (B, F) maxilla; (C, G) labium; (D, H) labrum; (I) elytron; (J, K) wing. Abbreviations: lh, laciniar hook (uncus). Scale bars 0.1 mm (A–H), 0.6 mm (I), 0.7 mm (J, K).