Scybalocanthon arnaudi Silva & Valois, 2019

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

DOI

http://doi.org/10.5281/zenodo.4335188

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. 1D View FIGURE 1 , 4E View FIGURE 4 , 5D View FIGURE 5 , 6E View 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. 1D View FIGURE 1 , 2A View FIGURE 2 , 1P View FIGURE 1 , 2K View FIGURE 2 , 1I, 1T View FIGURE 1 ); femora almost completely yellow or brown, with black spots only on the tips ( Fig. 3G View FIGURE 3 ); eighth elytral stria with thin carina on anterior portion ( Fig. 3D View FIGURE 3 ); endophallus with bristles right beside the FLP sclerite ( Figs. 5D, R, N, W, H, Q View FIGURE 5 ); and additional sclerite ( AS) absent ( Figs. 5D, R, N, W, H, Q View 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. 4E View 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. 4E View FIGURE 4 ), not straight as in S. pinopterus   ( Fig. 4S View 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. 2B View 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. 4E View 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. 5D View FIGURE 5 ). FLP short, comma-shaped, with two sets of bristles and a set of microbristles right beside it ( Fig. 5D View FIGURE 5 ). A+SA with two superposed and elongate sclerites ( Fig. 5D View 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. 6E View FIGURE 6 ). Endemism areas: Brazilian sub-region: Boreal Brazilian dominion: Napo and Imerí provinces; South Brazilian dominion: Ucayali province (see Morrone 2014; fig. 12).