Scybalocanthon arnaudi Silva & Valois,

Silva, Fernando A. B. & Valois, Marcely, 2019, A taxonomic revision of the genus Scybalocanthon Martínez, 1948 (Coleoptera Scarabaeidae: Scarabaeinae: Deltochilini), Zootaxa 4629 (3), pp. 301-341: 314

publication ID

https://doi.org/10.11646/zootaxa.4629.3.1

publication LSID

lsid:zoobank.org:pub:1D47B452-0A40-4BC5-9BBA-C06DEB298C9A

persistent identifier

http://treatment.plazi.org/id/9D12E557-3A54-FF93-95F1-F8D9FEC6C2AD

treatment provided by

Felipe

scientific name

Scybalocanthon arnaudi Silva & Valois
status

new species

Scybalocanthon arnaudi Silva & Valois  , new species

( Figs. 1DView FIGURE 1, 4EView FIGURE 4, 5DView FIGURE 5, 6EView FIGURE 6)

Etymology. Named in honor of Patrick Arnaud, a scarabaeidologist who collected part of the type series.

Diagnosis. Specimens of S. arnaudi  are similar to those of S. federicoescobari  new species, S. martinezi  new species, S. papaxibe  new species, S. pinopterus  , and S. uniplagiatus  by having the pronotum uniformly colored, or with one elliptical spot on the central portion ( Figs. 1DView FIGURE 1, 2AView FIGURE 2, 1PView FIGURE 1, 2KView FIGURE 2, 1I, 1TView FIGURE 1); femora almost completely yellow or brown, with black spots only on the tips ( Fig. 3GView FIGURE 3); eighth elytral stria with thin carina on anterior portion ( Fig. 3DView FIGURE 3); endophallus with bristles right beside the FLP sclerite ( Figs. 5D, R, N, W, H, QView FIGURE 5); and additional sclerite ( AS) absent ( Figs. 5D, R, N, W, H, QView FIGURE 5). They can be distinguished from those of S. federicoescobari  , S. martinezi  , S. papaxibe  , and S. uniplagiatus  by the left paramere lacking acute projection on dorsal margin and lacking bilobate excavation on ventral margin ( Fig. 4EView FIGURE 4) (other species with acute projection and bilobate excavation on dorsal and ventral margins, respectively); from those of S. pinopterus  by the ventral margin of parameres curved outward on its apical one-half ( Fig. 4EView FIGURE 4), not straight as in S. pinopterus  ( Fig. 4SView FIGURE 4).

Description. Body. Oval-elongate. Surface opaque (except pronotum), completely microgranulate. Color. Most of pronotum, lateral portion of hypomera, and middle of femora yellow or light brown. Other parts dark brown.

Length. 8.0–10.0 mm. Thorax. Pronotum with one brown and rounded spot at the anterocentral portion ( Fig. 2BView FIGURE 2). In some, spot absent. Anterior angles of pronotum with approximately 90°. Lateral margin strongly curved outward at the middle portion. Elytra. Striae thin and shiny, punctures conspicuous. Eighth stria with a thin carina at the anterior portion. Aedeagus. Parameres slightly asymmetrical ( Fig. 4EView FIGURE 4). Dorsal margin of parameres curved inward from the basal to medial portions, apical portion curved outward. Ventral margin of parameres with a rounded excavation at the basal portion, from the medial to apical portions curved outward. SRP circular, with handle-shaped extension ( Fig. 5DView FIGURE 5). FLP short, comma-shaped, with two sets of bristles and a set of microbristles right beside it ( Fig. 5DView FIGURE 5). A+SA with two superposed and elongate sclerites ( Fig. 5DView FIGURE 5).

Type material. Holotype. PERU: LORETO: Rio Pucacuro, bosque de cierro firme poco colinado, 1.xii.2007, pitfall human feces, 213 m, Cesar Moreno— 1♂ ( CEMT)  . Paratypes [47 males, 19 females]. PERU  : LORETO, 1.5 km N Teniente López [site 2], 230–305 m (2°35’39.6’’S, 76°6’55’’W), 18–26.vii.1993, R. Leschen, flight interception trap— 23♀ 28♂ ( CMNC, MZUFPA)GoogleMaps  ; Campamento San Jacinto , 175–215 m (2°18.75’S, 75°51.77’W), 3–12.vii.1993, R. Leschen, flight interception trap— 5♀ 9♂ ( CMNC)GoogleMaps  . HUÁNUCO: Puerto Inca, 20.ii.2005 — 1♀ ( CEMT)  ; Tingo Maria , xi.1977, P. Arnaud— 1♀ ( CEMT)  ; LORETO: Rio Pucacuro , bosque de cierro firme poco colinado, 1.xii.2007, pitfall human feces, 213 m, Cesar Moreno— 1♂ ( CEMT)  . ECUADOR: NAPO, 20 km S Tena , 600 m (1°8’58’’S, 77°50’26’’W), 9–11.vii.1976, S. Peck, forest, dung traps (dung traps 36–38)— 2♂ 2♀ ( CMNC)GoogleMaps  ; Estación Biológica Jatun Sacha , 21 km E Puerto  Napo, 400 m (1°4’5’’S, 77°36’50’’W), 8.vii.1994, F. Génier, virgin rainforest, feces trap— 2♀ ( CMNC)GoogleMaps  ; Estación Biológica Jatun Sacha , 21 km E Puerto  Napo, 400 m (1°4’5’’S, 77°36’50’’W), 9.vii.1994, F. Génier, virgin rainforest, feces trap— 1♂ 1♀ ( CMNC)GoogleMaps  ; Estación Biológica Jatun Sa- cha, 21 km E Puerto  Napo, 400 m (1°4’5’’S, 77°36’50’’W), 11.vii.1994, F. Génier, virgin rainforest, feces trap— 1♂ ( CMNC)GoogleMaps  ; Estación Biológica Jatun Sacha , 21 km E Puerto  Napo, 400 m (1°4’5’’S, 77°36’50’’W), 15.vii.1994, Levy & Génier, virgin rainforest, flight interception trap— 1♂ ( CMNC)GoogleMaps  ; Estación Biológica Jatun Sacha , 21 km E Puerto  Napo, 400 m (1°4’5’’S, 77°36’50’’W), 21.vii.1994, F. Génier, virgin rainforest, carrion trap— 1♀ ( CMNC)GoogleMaps  ; Scyasu- ni, 20–21.X. 1997, 200m, D. Padilla & I. Tapin— 1♀ ( CEMT)  ; ORELLANA: Francisco de Orellana, Rodrigo Borja , IAMOE, 4.vi.2000,A. Dávalos— 1♂ ( CEMT)  ; Río Tiputini, Yasuni Research Station (76°24’W, 0°40.5’S), vii.1999, flight intercept trap, A. Tishechkin— 1♀ ( CEMT)GoogleMaps  ; PASTAZA: Bosque Moretecocha , 3.vii.1996, J. Naranjo— 1♂ ( CEMT)  ; Arajuno , 3–11.xii. 2000, 750 m, Maly— 1♀ ( CEMT)  ; Estación Científica Yasuní ( PUCE)  [site 7], Parque Nacional Yasuní , 215 m (0°38’S, 76°36’W), 27.vii–1.viii.1998, Ratcliffe, Jameson, Smith, Villatoro, lowland rainforest, pitfall trap, dung— 1♂ ( CMNC)GoogleMaps  . COLOMBIA: AMAZONAS, Leticia , 215 m (4°11’20’’S, 69°56’9’’W), 19–25.ii.1972, H. & A. Howden— 1♀ ( CMNC)GoogleMaps  ; Leticia , 215 m (4°11’20’’S, 69°56’9’’W), 24–28.ii.1974, S. Peck— 1♀ ( CMNC)GoogleMaps  ; Los Alpes, Leticia , 213 m (4°4’25’’S, 70°0’5’’W), 23.ii–2.iii.1974, S. Peck, dung trap— 2♀ ( CMNC)GoogleMaps  ; road end, Leticia , 213 m (4°4’9’’S, 69°59’56’’W), 23.ii–2.iii.1974, S. Peck, dung trap— 1♂ ( CMNC)GoogleMaps  ;

Distribution. Known from Peru, Ecuador and Colombia ( Fig. 6EView FIGURE 6). Endemism areas: Brazilian sub-region: Boreal Brazilian dominion: Napo and Imerí provinces; South Brazilian dominion: Ucayali province (see Morrone 2014; fig. 12).