Canthidium (Neocanthidium) bokermanni ( Martínez et al., 1964 )

Carvalho De Santana, Edrielly C., Pacheco, Thaynara L. & Vaz-De, Fernando Z., 2019, Taxonomic revision of the Canthidium Erichson, 1847 species of the gigas group (Coleoptera, Scarabaeidae, Scarabaeinae), European Journal of Taxonomy 530, pp. 1-24 : 19-21

Canthidium (Neocanthidium) bokermanni ( Martínez et al., 1964)

Figs 3 , 10

Neocanthidium bokermanni Martínez et al., 1964: 168 ‒ 172 (original description).

Neocanthidium bokermanni – Solís & Kohlmann 2004: 5 (checklist). — Kohlmann & Solís 2006: 236 (checklist). — Cupello 2018: 453, 465, 467 (checklist).

Canthidium (Canthidium) bokermanni – Martínez & Halffter 1986: 21 (checklist).

Canthidium bokermanni – Nunes & Vaz-de-Mello 2013: 416 (mention).

Canthidium (Neocanthidium) bokermanni – Cupello 2018: 467 (new subgeneric assignment).

Dichotomius (Luederwaldtinia) paraguayanus Gandini & Aguilar, 2009 (parts): 139, figs 1–8 (2 paratypes).

Type material examined

Holotype ARGENTINA • ♂; handwritten label; “ARGENTINA, TUCUMAN, Dto BURRUYAÇÚ/ Km. 5 Burruyaçu/ a San Ramón/ Coll. Martínez // 28-III- 946 ”; “HOLOTYPUS”; “ Neocanthidium / bokermanni / M., H. y P sp. n. ♂ / A. MARTÍNEZ DET.1963”; “ MACN-En 903 ”; MACN.

Paratypes BOLIVIA • 1 ♀; Santa Cruz, Santa Cruz de la Sierra; 17°52 ′ 00.00 ″ S, 63°00 ′ 00.00 ″ E; 10 Nov. 1955; R. Zischa leg.; CEMT .

Dichotomius paraguayanus

Paratypes

PARAGUAY • 1 ♂; Concepción, Zanja Morotí ; 17 Nov. 2001; Martínez leg.; CEMT • 1 ♂; Boquerón, Loma Plata ; 24 Sep. 1995; Drechsel leg.; CEMT .

Other specimens examined

ARGENTINA • 1 ♀; Chaco, Potrero ; 26º08 ′ 35.8 ″ S, 61º41 ′ 49.5 ″ W; 31 Oct. 2016; Guerra Alonso leg.; CEMT .

BOLIVIA • 1 ♂; Santa Cruz, Germán Busch, Puerto Suárez, Cerro de Mutum ; 18°58 ′ 00 ″ S, 57°47 ′ 53.00 ″ E; Dec. 2012; P. Wagner leg.; CEMT • 1 ♀; Tarija, between Caiza and Crevaux ; blue light; 21°48 ′ 53 ″ S, 63°26 ′ 53 ″ W; 536 m a.s.l.; 5 Jan. 2005; Mann, Hamel and Herzog leg.; OUMNH .

BRAZIL • 1 ♀; Mato Grosso, Cuiabá; 8 Mar. 2016; L.P. Melo leg.; CEMT • 1 ♀; Chapada dos Parecis , 30 km N Uirapuru; FIT; 14°17 ′ S, 59°15 ′ W; 1–15 Dec. 2001; A. Foucart leg.; CEMT • 1 ♀; Diamantino, Vale da Solidão , riparian Forest; 14°21 ′ 50 ″ S, 56°7 ′ 23 ″ W; 18 Feb. 2009; D.T.C. Oliveira leg.; CEMT • 1 ♂; same locality as for preceding; 26 Jan. 2009; D.T.C. Oliveira leg.; CEMT • 1 ♀; same locality as for preceding; 14°21 ′ 52 ″ S, 56°7 ′ 23 ″ W; 23 Dec. 2008 – 26 Jan. 2009; D.T.C. Oliveira leg.; CEMT • 1 ♀; same locality as for preceding; 14°22 ′ 23 ″ S, 56°7 ′ 25 ″ W; 31 Jan.–14 Feb. 2009; D.T.C. Oliveira leg.; CEMT • 1 ♀; Porto Estrela, Estação Ecológica [“Est. Eco”] Serra das Araras ; light trap; 15°39 ′ 14 ″ S, 57°13 ′ 1 ″ W; Nov. 2003; L. Kaminski leg.; CEMT • 1 ♀; same locality as for preceding, Boca do José ; FIT; 15°39 ′ 14 ″ S, 57°13 ′ 1 ″ W; Nov. 2003; R. Nunes leg.; CEMT • 1 ♂; Tangará da Serra; 27 Mar. 2016; G.A.A. Arenhart leg.; BMNH • 2 ♀♀; Tangará da Serra, Chácara Asa Branca ; manual collection; 14°32 ′ 42 ″ S, 58°40 ′ 28 ″ W; Nov. 2011; E. Meurer leg.; CEMT • 1 ♀; Tangará da Serra, Campus UNEMAT ; light trap; 14º38 ′ 58 ″ S, 57º25 ′ 24 ″ W; 439 m a.s.l.; R.J. Silva leg.; CEMT • 1 ♀; Chácara Paraíso , semideciduous forest; FIT; 14°39 ′ 4 ″ S, 57°24 ′ 55 ″ W; 460 m a.s.l.; 26 Jan. 2011; CEMT • 1 ♀; same data as for preceding; BMNH • 2 ♂♂; Campos de Júlio, Chapada dos Parecis , 30 km N of Uirapuru; FIT; 14°17 ′ S, 59°15 ′ W; Dec. 2002; A. Foucart leg.; CEMT • 1 ♀; Cuiabá; 8 Mar. 2016; P.L. Mello leg.; CEMT • 1 ♀; Cláudia, Fazenda [“Faz.”] Iracema ; 11º37 ′ 44 ″ S, 55º05 ′ 54 ″ W; 20 Feb. 2011; M.F. Souza leg.; CEMT • 2 ♀♀; Mato Grosso do Sul, Corguinho, Quinta do Sol ; FIT; 19°49 ′ 57 ″ S, 54°49 ′ 45 ″ W; Feb. 2011; L.O. Bavutti leg.; CEMT .

Diagnosis

Canthidium bokermanni resembles C. gigas in the presence of a transverse carina on the head and distinct punctation of the pronotal disc; it differs only in the dorsal angles of the parameres. See comments under C. gigas for more details.

Redescription

HEAD. Surface with dense and distinctly punctation, especially on clypeus. With a transverse raised projection in the front.

PRONOTUM. Without anteromedial depression, disc anteriorly convex, sometimes with an anterior sinuosity forming two broad and shallow depressions (both surrounding the medial line).

HYPOMERON. With microstriae and setae in the basal part. Hypomeral carina complete, curved throughout its length.

METAVENTRITE. With simple and shallow punctation, laterobasal region with stronger punctation, lateral region with microsculpture obscurely variolate, almost semicircular.

MESEPIMERON AND MESEPISTERNUM. With shallow punctation, stronger microsculpture obscurely variolate, semicircular.

HIND LEG. Metafemora with a carina along posterior edge, anterior edge with setal fringe, surface with fine punctation. Metatibiae elongated and gradually dilated towards the apex; external margin serrated.

AEDEAGUS. In dorsal view, parameres lacking angulation apically and with a shallow excavation at apex; in lateral view, dorsally with internal median angulation of 160°.

Variation and sexual dimorphism

Total length ranges from 9 to 13 mm. The transverse carina of the head varies from rectangular to oval, regardless of the size and sex of the specimen. The males have a tooth in the upper ventral part, more developed in some specimens than in others. Males have ventrite VI wider medially, female ventrite VI is of the same length throughout. Males also have protibial spur flattened, while in females the protibial spur is narrowed and pointed.

Geographical distribution

The specimens examined were collected in Argentina (Chaco), Brazil (Mato Grosso and Mato Grosso do Sul), Bolivia (Santa Cruz), and Paraguay (Concepción and Boquerón). The species occurs in two different biogeographic dominions: the Chacoan dominion and the South Brazilian dominion.

Comments

Two paratypes of Dichotomius paraguayanus , which were incorrectly interpreted as females by Gandini & Aguilar (2009), proved to be males and to belong to C. bokermanni .

Figures

Fig. 3. Canthidium bokermanni (Martínez et al., 1964). A. Dorsal view. B. Lateral view of aedeagus. C. Dorsal view of aedeagus. Scale bars: 1 mm.

Fig. 10. Geographical distribution of Canthidium gigas Balthasar, 1939 (circles) and Canthidium bokermanni (Martínez et al., 1964) (triangles)..