Scybalocanthon trimaculatus ( Schmidt, 1922 ),

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: 335-337

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/9D12E557-3A7B-FFBA-95F1-FB05FBB3C695

treatment provided by

Felipe

scientific name

Scybalocanthon trimaculatus ( Schmidt, 1922 )
status

 

Scybalocanthon trimaculatus ( Schmidt, 1922) 

( Figs. 2View FIGURE 2 H–J, 4V, 5U, 6C)

Canthon trimaculatus Schmidt, 1922: 65  , 94 (original description); Balthasar 1939: 191 (identification key); Vulcano & Pereira 1967: 552 (distribution, identification key); Krajcik 2006: 31 (catalog); Krajcik 2012: 64; Vaz-de-Mello & Cupello 2018: 69 (figures 105–106), 70 (data of type specimens).

Canthon trimaculatum: Blackwelder 1944: 202  (checklist).

Scybalocanthon trimaculatus: Vulcano & Pereira 1967: 554  (distribution, identification key); Halffter & Martínez 1977: 6 (checklist); Medina et al. 2001: 137 (cited for Colombia); Medina et al. 2003: 65 (distribution); Carvajal et al. 2011: 316 (cited for Ecuador); Ratcliffe et al. 2015: 195 (cited for Peru); Chamorro et al. 2018: 98 (cited for Ecuador); Vaz-de-Mello & Cupello 2018: 69 (figures 105–106), 70 (data of type specimens); Chamorro et al. 2019: 232 View Cited Treatment , 233 (catalog of dung beetles species from Ecuador).

Diagnosis. Specimens of S. trimaculatus  are readily distinguishable from all other species by the body with metallic sheen, femora bicolored, pronotum with three black spots (two rounded spots on each side of midline anteriorly and one quadrate spot on midline posteriorly). In some individuals, anterior spots are missing, in others spots are fused and two smaller additional spots are present laterally ( Figs. 2View FIGURE 2 H–J); eighth elytral stria lacking carina at the anterior portion; and endophallus with microbristles right beside the FLP sclerite ( Fig. 5VView FIGURE 5).

Description. Body. Oval-elongate, with variable metallic sheen. Color. Most of pronotum, lateral portion of hypomera, pygidium, and middle of femora yellow or light brown. Head, elytra, prosternum, mesoventrite, mesoepisternae, metaepisternae, metaventrite, abdominal ventrites, trochanters, proximal and distal portions of femora, and tibiae dark brown or black. Length. 7.0–10.0 mm. Thorax. Pronotum with three black spots (two rounded spots on each side of midline anteriorly and one quadrate spot on midline posteriorly). In some individuals, anterior spots are missing, in others spots are fused and two smaller additional spots are present laterally ( Figs. 2View FIGURE 2 H–J). Anterior angles of pronotum approximately 85°. Lateral margin regularly curved outward, not forming an angle at the middle portion. Elytra. Striae thin, shiny, impressed, punctures inconspicuous. Eighth stria effaced at the basal third, lacking carina at the anterior portion. Aedeagus. Parameres symmetrical, apex pointed ( Fig. 4VView FIGURE 4). Dorsal margin of parameres curved inward at the basal portion. Ventral margin of parameres curved inward at the basal and apical portions, medial portion curved outward. SRP circular, with rounded handle-shaped extension ( Fig. 5VView FIGURE 5). FLP “J”- shaped, with microbristles right beside it ( Fig. 5MView FIGURE 5). A+SA with two superposed and elongate sclerites ( Fig. 5VView FIGURE 5). AS subrectangular ( Fig. 5VView FIGURE 5).

Type material. Canthon trimaculatus Schmidt  , lectotype ♂ (here designated; SMTD)  : “Cachabé / low C. I. 97. / (Rosenberg)” // “ Coll. C. Felsche / Kauf 20 / 1918” // “ Canthon  / trimaculatus  / n.sp. a. Schmidt ” // “Typus” // “ LECTOTYPE ♂ / Canthon  / trimaculatus  / Schmidt / des. F. Z. Vaz-de-Mello. ”  Paralectotypes 1 ♂ and 2♀ ( SMTD)  : “R. Dagua / Colombia / W. Rosenberg” // “ Coll. C. Felsche / Kauf 20 / 1918” // “ PARALECTOTYPE ♂ or ♀ / Canthon  / trimaculatus  / Schmidt / des. F. Z. Vaz-de-Mello ”. Paralectotype  ♂ ( SMTD)  : “Cachabé / to Paramba / II. 97” // “ Coll. C. Felsche / Kauf 20 / 1918” // “ PARALECTOTYPE ♂ / Canthon  / trimaculatus  / Schmidt / des. F. Z. Vaz-de-Mello ”. Paralectotype  ♀ ( SMTD)  : “Cachabé / low c. XII. 96 / (Rosenberg)” // “ Coll. C. Felsche / Kauf 20 / 1918” // “ PARALECTOTYPE ♀ / Canthon  / trimaculatus  / Schmidt / des. F. Z. Vaz-de-Mello ”. Paralectotype  ♀ ( SMTD)  : “ Surinam ” // “ Coll. C. Felsche / Kauf 20 / 1918” // “ PARALECTOTYPE ♀ / Canthon  / trimaculatus  / Schmidt / des. F. Z. Vaz-de-Mello ”. Paralectotype ( IRSN): “ Columbie ” // trimaculatus  / m. ” // “ J.J. Gillet det. / vend.: / Canthon  / trimaculatus Gillet  / R.M.H.N. Belg. 10.640” // “ PARALECTOTYPE ♀? / Canthon  / trimaculatus  / Schmidt / des. F. Z. Vaz-de-Mello ”  . Paralectotype ♀ ( NHRS)  : “ R. Dagua / Colombia / W. Rosenberg ” // “ trimacul. ” // “trimaculatus / Schm ” // “ Scybalocanthon  / 3- maculatus  / (Schm) / P. Pereira det. 60 ” // “37 / 56” // “ PARALECTOTYPE ♀ / Canthon  / trimaculatus  / Schmidt / des. F. Z. Vaz-de-Mello ”  .

Non-type material [ 100 males, 114 females]: COLOMBIA: CHOCÓ: Unión Panamericana, Salero (76°44’W, 5°32’N), 3–5.vi. 2010, 120 m, J. Arias— 3♂ 1♀ ( CEMT)GoogleMaps  ; Quibdó-Istmina km 40 (5°22’N, 76°37’W), ix.1972, Mar- tínez— 1♂ ( CMNC)GoogleMaps  ; Quibdó , La Troja, ix.1972, Martínez— 1♂ 1♀ ( CMNC)  ; VALLE DEL CAUCA, Anchicaya Dam , 70 km E Buenaventura, 366 m (3°46’N, 76°43’W), 26.vii.1970, H. &A. Howden, human feces— 1♀ ( CMNC)GoogleMaps  ; NARIÑO: Barbacoas, Vereda El Peje, Llanura Pacifica , interior de bosque (78°45’9.88”W, 1°25’59.88”N), pit- fall, human feces, 5–15.xii. 2009, 715 m, J. Castillo-Garcia & P. Botina-Beltrán— 1♂ ( CEMT)GoogleMaps  ; Altaquer, El Barro, Reserva Natural Rio Ñambi , flanco occidental de la cordillera occidental (78°5’W, 1°18’N), 2–15.v.2010, pitfall, human feces, 1450 m— 1♂ ( CEMT)GoogleMaps  ; La Espriella , iv.1995, 50 m, F. Escobar— 2♂ ( CEMT)  . ECUADOR: CANÃR: Javín , ii.1992, 850– 1400 m, P. Arnaud— 1♂ ( CEMT)  ; CARCHI: Cabeceras Río Baboso—8 [unsexed specimens] ( MQCAZ)  ; Tobar Donoso 300 m—5 [unsexed specimens] ( MECN)  ; COTOPAXI: Guasaganda Km 4, 20.xii. 1997, 500 m, C. Carpio— 1♂ 1♀ ( CEMT)  ; IMBABURA: Lita 682 m—5 [unsexed specimens] ( MQCAZ)  . SANTO DOMINGO DE LOS TSACHILAS: La Perla—5 [unsexed specimens] ( MQCAZ)  ; TUNGURAHUA: Banõs , xi.1979, [anonymous]— 1♂ ( CEMT)  . ESMERALDAS, Charco Vicente (0°42’4’’N, 78°54’38’’W), 16.v.2001, J. Quito & F. Añapa, pitfall trap, human feces— 3♂ 2♀ ( CMNC)GoogleMaps  ; Chispero (0°47’N, 78°55’W), 15.ii.2001, J. Celi & I. Yépez, pitfall trap, human feces— 14♂ 15♀ ( CMNC)GoogleMaps  ; Estación Biológica Bilsa (0°20’24’’N, 79°42’36’’W), 5.vi–7.vii.1996, P. Hibbs, flight interception trap— 1♂ ( CMNC)GoogleMaps  ; Estación Forestal La Chiquita , 11 km SE San Lorenzo, 5 m (1°10’N, 78°47’W), 6–11.vi.1975, S. Peck, forest, dung traps— 9♂ 12♀ ( CMNC, MZUFPA)GoogleMaps  ; Majua (0°42’11’’N, 79°32’27’’W), 28.iii.2001, J. Celi & I. Yépez, pitfall trap, human feces— 1♂ 1♀ ( CMNC)GoogleMaps  ; Palma Real (0°22’48’’N, 79°20’29’’W), 24.iii.2001, I. Yépez, pitfall trap, human feces— 17♂ 13♀ ( CMNC)GoogleMaps  ; Palma Real (0°22’48’’N, 79°20’29’’W), 25.iii.2001, J. Celi, pitfall trap, human feces— 3♂ 5♀ ( CMNC)GoogleMaps  ; Playa de Oro, Esteiro Pote (0°51.875’N, 78°43.743’W), 12.ii.1999, J. Celi & A. Dávalos, pitfall trap, feces— 1♂ ( CMNC)GoogleMaps  ; Playa de Oro, Esteiro Pote (0°51.875’N, 78°43.743’W), 11.xii. 1998, 200 m, A. Dávalos— 1♂ 1♀ ( CEMT)GoogleMaps  ; Playa de Oro, Esteiro Pote (78°43.743’W, 00°51.875’N), 12.ii.1999, J. Celi & A. Dávalos— 2♂ 5♀ ( CEMT)GoogleMaps  ; Playa de Oro, Estación La Chiquita (78°45’48.1”W, 1°14’1.3”N), 4.v.1997, 60 m, C. Castro— 1♂ ( CEMT)GoogleMaps  ; Playa Rica (0°53’N, 78°46’W), 21.iii.2001, J. Celi, pitfall trap, human feces— 5♂ 9♀ ( CMNC)GoogleMaps  ; Playa Rica (0°53’N, 78°46’W), 22.iii.2001, I. Yépez, pitfall trap, human feces— 7♂ 6♀ ( CMNC)GoogleMaps  ; Punta de Venado (0°56’38’’N, 78°59’46’’W), 23.xi.2000, J. Celi, pitfall trap, human feces— 1♂ ( CMNC)GoogleMaps  ; San Mateo (0°53’15’’N, 79°38’5’’W), 5.x.1956, Förster— 1♂ ( CMNC)GoogleMaps  ; Tsejpi (0°47’N, 78°50’W), 17.ii.2001, I. Yépez, pitfall trap, human feces— 4♂ 2♀ ( CMNC)GoogleMaps  ; Tsejpi (0°47’N, 78°50’W), 18.ii.2001, I. Yépez, pitfall trap, human feces— 1♂ 2♀ ( CMNC)GoogleMaps  ; Tsejpi (0°47’N, 78°50’W), 19.ii.2001, J. Celi, pitfall trap, human feces— 2♂ 5♀ ( CMNC)GoogleMaps  . LOS RÍOS, 47 km S Santo Domingo , 213 m (0°35’S, 79°22’W), 24.ii.1976, H.F. Howden & V.G. Nealis— 2♂ 1♀ ( CMNC)GoogleMaps  ; 47 km S Santo Domingo , 213 m (0°35’S, 79°22’W), 27.ii.1976, V. Nealis— 1♂ ( CMNC)GoogleMaps  ; Estación Científica Río Palenque [site 2], 200 m (0°36’S, 79°21’W), 25.iv– 6.vi.1996, P. Hibbs, flight interception trap (1996-02)— 1♂ ( CMNC)GoogleMaps  ; Estación Científica Río Palenque [site 2], 200 m (0°36’S, 79°21’W), iii.1989, P.L. Arnaud— 3♂ ( CEMT)GoogleMaps  ; Estación Científica Río Palenque , 47 km S Santo Do- mingo [site 1], 250 m (0°37’48’’S, 79°24’26’’W), 28–31.vii.1976, S. Peck, forest— 1♂ ( CMNC)GoogleMaps  ; Estación Científica Río Palenque , 47 km S Santo Domingo [site 1], 250 m (0°37’48’’S, 79°24’26’’W), 16–27.ii.1979, S.A. Marshall, dung trap— 2♂ ( CMNC)GoogleMaps  ; Estación Científica Río Palenque , 47 km S Santo Domingo [site 1], 250 m (0°37’48’’S, 79°24’26’’W), 17–25.ii.1979, L. Ling— 5♂ 8♀ ( CMNC)GoogleMaps  ; Estación Científica Río Palenque , 47 km S Santo Do- mingo [site 1], 250 m (0°37’48’’S, 79°24’26’’W), 19–20.ii.1979, L. Ling, dung cup trap— 1♀ ( CMNC)GoogleMaps  ; Estación Científica Río Palenque , 47 km S Santo Domingo [site 1], 250 m (0°37’48’’S, 79°24’26’’W), 21–22.ii.1979, L. Ling, dung cup trap— 2♂ 3♀ ( CMNC)GoogleMaps  ; Estación Científica Río Palenque , 47 km S Santo Domingo [site 1], 250 m (0°37’48’’S, 79°24’26’’W), 5.v–25.vii.1985, S. & J. Peck, malaise/flight interception trap— 1♂ 1♀ ( CMNC)GoogleMaps  ; Es- tación Experimental Tropical Pichilingue, Quevedo (1°0’13’’S, 79°27’50’’W), viii.1972, Martínez— 1♀ ( CMNC)GoogleMaps  ; Estación Experimental Tropical Pichilingue, Quevedo (1°0’13’’S, 79°27’50’’W), ix.1972, Martínez— 1♀ ( CMNC)GoogleMaps  ; Estación Experimental Tropical Pichilingue, Quevedo (1°0’13’’S, 79°27’50’’W), v.1976, Martínez— 7♀ ( CMNC)GoogleMaps  ; Estación Experimental Tropical Pichilingue, Quevedo (1°0’13’’S, 79°27’50’’W), xi.1976, Paliz— 1♀ ( CMNC)GoogleMaps  ; Estación Experimental Tropical Pichilingue, Quevedo (1°0’13’’S, 79°27’50’’W), i.1977, Paliz— 1♀ ( CMNC)GoogleMaps  ; Río Palenque (0°37’48’’S, 79°24’26’’W), 24.ii.1979, S. Marshall— 1♀ ( CMNC)GoogleMaps  ; MANABÍ, 78 km NE Chone, 85 km WSW Santo Domingo , 450 m (0°20’46’’S, 79°42’20’’W), 9–12.vi.1976, S. Peck, forest, dung traps— 2♀ ( CMNC)GoogleMaps  ; 90 km WSW Santo Domingo, 73 km NE Chone , 300 m (0°20’52’’S, 79°44’22’’W), 6–9.vi.1976, S. Peck, forest, dung trap (dung traps 3–5)— 3♂ 2♀ ( CMNC)GoogleMaps  ; PICHINCHA, 4 km SE Santo Domingo , 500 m (0°16’S, 79°7’W), 8–22.vi.1975, S. Peck, forest, dung trap— 2♂ 1♀ ( CMNC)GoogleMaps  ; Llurimaguas “Guayabilla”, R. Guayllabamba, xii.2010, W. Chamorro & P. Lahuatte— 1♂ ( CEMT)  ; Chiriboga road Km 12–20, 1–6.iii.1987, 1200–1600 m, P.L. Arnaud— 1♀ ( CEMT)  .

Distribution. Known from Colombia and Ecuador ( Fig. 6CView FIGURE 6). Endemism areas: Brazilian sub-region: Pacific dominion: Chocó-Darién, Western Ecuador, and Cauca provinces (see Morrone 2014; fig. 12).

Remarks. Molano & Medina (2010) presented a different interpretation relative to the identity of the FPL sclerite in this species. The authors described and illustrated this sclerite only as membranous (see fig. 95 in Molano & Medina 2010). In fact, a membranous portion with microbristles exists where this sclerite is located ( Fig. 5VView FIGURE 5). However, according to our interpretation of the primary homology of the sclerites in Scybalocanthon  , the FLP sclerite would be one of the two sclerites described and illustrated as lateral sclerites by the authors (see fig. 106 in Molano & Medina 2010). Thus, the specimens examined by us had only one lateral sclerite (referred to here as additional sclerite ( AS) according to the nomenclature proposed by Tarasov and Génier 2015).

IRSN

Institut Royal des Sciences Naturelles de Belgique

NHRS

Swedish Museum of Natural History, Entomology Collections

MECN

Museo Ecuadoriano de Ciencias Naturales

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Scarabaeidae

Genus

Scybalocanthon

Loc

Scybalocanthon trimaculatus ( Schmidt, 1922 )

Silva, Fernando A. B. & Valois, Marcely 2019
2019
Loc

Canthon trimaculatus

Vaz-de-Mello, F. Z. & Cupello, M. 2018: 69
Krajcik, M. 2012: 64
Krajcik, M. 2006: 31
Vulcano, M. A. & Pereira, F. S. 1967: 552
Balthasar, V. 1939: 191
Schmidt, A. 1922: 65
Loc

Canthon trimaculatum:

Blackwelder, R. 1944: 202
Loc

Scybalocanthon trimaculatus: Vulcano & Pereira 1967: 554

Chamorro, W. & Marin-Armijos, D. & Asenjo, A. & Vaz-de-Mello, F. Z. 2019: 232
Chamorro, W. & Marin-Armijos, D. & Granda, V. & Vaz-de-Mello, F. Z. 2018: 98
Vaz-de-Mello, F. Z. & Cupello, M. 2018: 69
Ratcliffe, B. C. & Jameson, M. L. & Figueroa, L. & Cave, R. D. & Paulsen, M. J. & Cano, E. B. & Beza-Beza, C. & Jimenez-Ferbans, L. & Reyes-Castillo, P. 2015: 195
Carvajal, V. & Villamarin, S. & Ortega, A. M. 2011: 316
Medina, C. A. & Scholtz, C. H. & Gill, B. D. 2003: 65
Medina, C. A. & Lopera-Toro, A. & Vitolo A. & Gill, B. 2001: 137
Halffter, G. & Martinez, A. 1977: 6
Vulcano, M. A. & Pereira, F. S. 1967: 554