Scybalocanthon uniplagiatus ( 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: 337-338

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/9D12E557-3A7D-FFBB-95F1-FB95FB20C265

treatment provided by

Felipe

scientific name

Scybalocanthon uniplagiatus ( Schmidt, 1922 )
status

new combination

Scybalocanthon uniplagiatus ( Schmidt, 1922)  new combination

( Figs. 2KView FIGURE 2, 4WView FIGURE 4, 5WView FIGURE 5, 6DView FIGURE 6)

Canthon uniplagiatus Schmidt, 1922: 65  , 82, 94 (original description, remarks); Balthasar 1939: 192 (description); Pereira & Martínez 1956: 119 (synonymized Canthon uniplagiatus  with Scybalocanthon pygidialis  ); Krajcik 2006: 30 (catalog); Krajcik 2012: 64 (catalog); Vaz-de-Mello & Cupello 2018: 69 (figures 107–108), 70 (data of type specimens).

Canthon uniplagiatum: Blackwelder 1944: 202  (checklist).

Scybalocanthon uniplagiatus: Vulcano & Pereira 1967: 554  (distribution, identification key).

Diagnosis. Specimens of S. uniplagiatus  are similar to those of S. arnaudi  , S. federicoescobari  , S. martinezi  , S. papaxibe  , and S. pinopterus  by having the pronotum uniformly colored, or with one elliptical spot on the central portion ( Figs. 2K, 2AView FIGURE 2, 1P, 1I, 1D, 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 at the anterior portion ( Fig. 3DView FIGURE 3); endophallus with bristles right beside the FLP sclerite ( Figs. 5W, R, N, H, D, QView FIGURE 5); and additional sclerite ( AS) absent ( Figs. 5W, R, N, H, D, QView FIGURE 5). They can be distinguished from those of S. arnaudi  and S. pinopterus  by the strongly asymmetrical parameres; left paramere with acute projection on dorsal margin and bilobate excavation on ventral margin ( Fig. 4WView FIGURE 4) (other species with slightly asymmetrical parameres, lacking acute projection and bilobate excavation on dorsal and ventral margins, respectively ( Figs. 4S, 4EView FIGURE 4)); from those of S. federicoescobari  , S. martinezi  , and S. papaxibe  by the bilobate excavation of the ventral margin of the left paramere extending along one-third of the paramere margin ( Fig. 4WView FIGURE 4) (in S. federicoescobari  and S. papaxibe  the excavation extending along one-fourth of the paramere margin ( Figs. 4R, 4IView FIGURE 4); in S. martinezi  the excavation is wider and deeper, extending at least one-half of the paramere margin ( Fig. 4OView FIGURE 4)).

Description. Body. Oval-elongate. Surface opaque, completely microgranulate. Color. Most of pronotum, hypomera, metaepisternae, metaventrite, abdominal ventrites, pygidium, and femora yellow or light brown. Head, elytra, prosternum, mesoventrite, mesoepisternae, trochanters, and tibiae dark brown. Length. 8.5–10.3 mm. Thorax. Pronotum with one brown rounded spot at the antero-central portion ( Fig. 2KView FIGURE 2). In some individuals, spot absent. Anterior angles of pronotum approximately 85°. Lateral margin regularly curved outward, not forming an angle at the middle portion. Elytra. Striae thin and shiny, punctures inconspicuous. Eighth stria with a thin carina at the anterior portion. Aedeagus. Parameres strongly asymmetrical ( Fig. 4WView FIGURE 4). Dorsal margin of right paramere curved inward, apex obliquely truncate. Ventral margin of right paramere substraight, with a rounded excavation at the basal portion. Dorsal margin of left paramere curved inward from the basal to medial portions, apical portion with a short and pointed projection. Ventral margin of left paramere substraight, with a bilobate excavation at the basal portion, apical portion pointed. SRP circular, with a rounded handle-shaped extension ( Fig. 5WView FIGURE 5). FLP short, comma-shaped, with three sets of bristles right beside it ( Fig. 5WView FIGURE 5). A+SA with two superposed and elongate sclerites ( Fig. 5WView FIGURE 5).

Type material. Canthon uniplagiatus Schmidt  , lectotype ♂ (here designated; SMTD): “ Amazonas ” // “ Coll. C. Felsche / Kauf 20 / 1918” // “ Canthon  / uniplagiatus / n. sp. a. Schmidt” // “LECTOTYPE ♂ / Canthon  / uniplagiatus  / Schmidt / des. F. Z. Vaz-de-Mello ”.  Paralectotype ♂ ( SMTD): “ Amazonas ” // “ Coll. C. Felsche / Kauf 20 / 1918” // “ Typus ” // “ PARALECTOTYPE ♂ / Canthon  / uniplagiatus  / Schmidt / des. F. Z. Vaz-de-Mello ”.  Paralectotype ♂ ( NHRS): “ Amazonas ” // “ uniplagiatus  ” // “ uniplagia / tus A. Schm.” // “ uniplagiatus  / Schm ” // “ Scybalocanthon  / uniplagiatus  / ( Schm ) / P. Pereira det. 60 ” // “38 / 56 ” // “3405 / E92+” // [aedeagus glued on a card] // “ PARALECTOTYPE ♂ / Canthon  / uniplagiatus  / Schmidt / des. F. Z. Vaz-de-Mello ”  .

Non-type material [ 22 males, 18 females, 5 unsexed specimens]: BRAZIL: ACRE: Río Branco, Fazenda Catuaba , vi.1997, Morato— 1♀ ( CEMT)  ; Río Branco, Fazenda Catuaba , primary forest, ii.1997, F.Z. Vaz-de-Mel- lo— 3♂ 2♀ ( CEMT)  ; AMAZONAS: Br-319, Km 350 (61°50’22.6”W, 5°12’56.4”S), 2.viii.2007, H. Gasca— 1♂ 1♀ ( CEMT)GoogleMaps  ; MATO GROSSO: Cláudia (55°18’26”W, 11°26’01”S), 4.iv. 2010, 325 m, F.P. Florêncio— 1♀ ( CEMT)GoogleMaps  ; Cláudia, Fazenda Continental (55°18’24”W, 11°26’01”S), 20.ii.2011, M.F. Souza— 1♂ ( CEMT)GoogleMaps  ; Cláudia, Fazenda Continental (55°19’29”W, 11°24’38”S)— 1♀ ( CEMT)GoogleMaps  ; Cláudia, Fazenda Continental (55°17’15”W, 11°34’54”S), 20.ii.2010 — 3♂ 1♀ ( CEMT)GoogleMaps  ; Cotriguaçu, Fazenda São Nicolau (58°12’53”W, 09°50’19”S), Fungi trap, xii.2009, Vaz-de-Mello— 1♂ ( CEMT)GoogleMaps  ; Cotriguaçu, Fazenda São Nicolau , secondary forest (58°13’20”W, 9°51’18”S), 15.xii.2009, pitfall, human feces, 200 m— 2♂ 3♀ ( CEMT)GoogleMaps  ; Cotriguaçu, Fazenda São Nicolau, secondary forest ( Site 4), 230 m (9°49’55’’S, 58°13’8’’W), 2.xii.2013, F. Génier, primary forest, flight interception trap (2013- 124)— 1♂ ( CMNC)GoogleMaps  ; Cotriguaçu, Fazenda São Nicolau, secondary forest ( Site 4), 230 m (9°49’55’’S, 58°13’8’’W), 4.xii.2013, F. Génier, primary forest, dung trap (2013-136)— 1♀ ( CMNC)GoogleMaps  ; Fazenda São Nicolau ( Site 6), 220 m (9°49’16’’S, 58°15’33’’W), 1.xii.2013, F. Génier, primary forest, dung trap (2013-117)— 5♂ 3♀ ( CMNC)GoogleMaps  ; Fazenda São Nicolau ( Site 6), 220 m (9°49’16’’S, 58°15’33’’W), 3.xii.2013, F. Génier, primary forest, flight interception trap (2013-131)— 2♂ ( CMNC)GoogleMaps  ; Fazenda São Nicolau ( Site 6), 220 m (9°49’16’’S, 58°15’33’’W), 4.xii.2013, F. Génier, primary forest, flight interception trap (2013-135)— 1♂ ( CMNC)GoogleMaps  ; Curvelândia, Fazenda Aparecido, Ba- cia Cabaçal (58°00’02”W, 15°33’43”S), ii.2004, M. Santos-Filho—1 [unsexed specimen] ( CEMT)GoogleMaps  ; Indiavaí, Fazenda Nova Canaã, Bacia Jauru (58°40’06”W, 15°16’31”S), vii.2004, M. Santos-Filho—1 [unsexed specimen] ( CEMT)GoogleMaps  ; Querência, Fazenda São Luiz , ii.2009, R. Andrade—1 [unsexed specimen] ( CEMT)  ; Querência, Fazenda São Luiz (52°21’77”W, 40°18’52”S), flight interception trap—1 [unsexed specimen] ( CEMT)  ; Querência, Fazenda São Luiz (52°22’W, 12°39’S), vii.2008 —1 [unsexed specimen] ( CEMT)GoogleMaps  ; Juara, Usina Hidroelétrica Castanheira (57°43’5.13”W, 11°10’33.11”S), ii.2015, Río Santos— 1♀ ( CEMT)GoogleMaps  ; Tangará da Serra, Fazenda Filé do Boi (57°24’41”W, 14°38’7”S), 25.i.2011, R.J. Silva— 1♂ 2♀ ( CEMT)GoogleMaps  ; RONDÔNIA: 62 km sul de Ariquemes, Fazenda Rancho Grande, ii.1997, Vaz-de-Mello, Vulinec, & Mellow— 1♂ ( CEMT)  ; PARÁ, Cachimbo (8°58’S, 54°40’W), x.1955, Werner— 1♀ ( CMNC)GoogleMaps  .

Distribution. Known from Brazil (Acre, Amazonas, Mato Grosso, Rondônia, Pará) ( Fig. 6DView FIGURE 6). Endemism areas: Brazilian sub-region: South Brazilian dominion: Madeira and Rondônia provinces (see Morrone 2014; fig. 12).

Remarks. Schmidt (1922) described Canthon pygidialis  and Canthon uniplagiatus  . The author did not present a comparative diagnosis between these two species in that work. However, he made it clear that specimens of Canthon pygidialis  have a dark longitudinal line on the thorax [pronotum], while Canthon uniplagiatus  has a dark spot on the antero-central portion of the thorax [pronotum]. Pereira & Martínez (1956) synonymized Canthon uniplagiatus  with Scybalocanthon pygidialis  reporting only that they did not find differences between them. Based on type examination, we found the same differences reported above by Schmidt (1922) in describing these two species. Although we were unable to dissect any genitalia in the two type series, recently collected specimens with these respective coloration pattern on pronotum present significant differences in the shape of parameres. Specimens identified as S. uniplagiatus  by us have the excavation of ventral margin of parameres deeper and wider than specimens of S. pygidialis  . Besides, the dorsal margin of the left paramere has a pointed projection in specimens of S. pygidialis  , while in S. uniplagiatus  this projection is shorter and rounded. We therefore recognize S. uniplagiatus  as a valid species. It is included in Scybalocanthon  according to our current definition of the genus.

SMTD

Germany, Dresden, Museum fuer Tierkunde

NHRS

Swedish Museum of Natural History, Entomology Collections

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Scarabaeidae

Genus

Scybalocanthon

Loc

Scybalocanthon uniplagiatus ( Schmidt, 1922 )

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

Canthon uniplagiatus

Krajcik, M. 2006: 30
Pereira, F. S. & Martinez, A. 1956: 119
Balthasar, V. 1939: 192
Schmidt, A. 1922: 65
Loc

Canthon uniplagiatum:

Blackwelder, R. 1944: 202
Loc

Scybalocanthon uniplagiatus: Vulcano & Pereira 1967: 554

Vulcano, M. A. & Pereira, F. S. 1967: 554