Paraegidium barretoi Frolov, Akhmetova

Frolov, Andrey V., Akhmetova, Lilia A. & Vaz-de-Mello, Fernando Z., 2017, Revision of the South American genus Paraegidium Vulcano et al. (Coleoptera: Scarabaeidae: Orphninae), Journal of Natural History (J. Nat. Hist.) 51 (17 - 18), pp. 995-1014 : 1004-1006

Paraegidium barretoi Frolov, Akhmetova & Vaz-de-Mello, sp. nov.

( Figures 2 (a–h), 7)

Type locality

Brazil, Mato Grosso, Cotriguaçu, Fazenda São Nicolau.

Type material examined

Holotype, male at CEMT labelled ‘ BRASIL: Mato Grosso Cotriguaçu Fazenda São Nicolau. Mata, luz branca. 08-XII-2009 M.R. Barreto’.

Paratypes. BRAZIL . Mato Grosso: two males and one female at CEMT labelled ‘ BRASIL: Mato Grosso Cotriguaçu Fazenda São Nicolau . Mata, luz negra. 10-XII-2009 M.R. Barreto’; 12 males and 23 females at CEMT, EPGC and ZIN labelled ‘ BRASIL: Mato Grosso Cotriguaçu Fazenda São Nicolau . Luz. 14.XI.2007. O. Peres Filho’; one female at CEMT labelled ‘ BRASIL: Mato Grosso Cotriguaçu Fazenda São Nicolau . Luz. 15.XII.2007. O. Peres Filho’; three females at CEMT labelled ‘ BRASIL: Mato Grosso Cotriguaçu Fazenda São Nicolau . Luz. 16. X.2007. O. Peres Filho’; six males and two females at CEMT and ZIN labelled ‘ BRASIL: Mato Grosso Cotriguaçu Fazenda São Nicolau . Luz. 29.XI.2007. O. Peres Filho’; one female at CEMT labelled ‘ BRASIL: Mato Grosso Cotriguaçu Fazenda São Nicolau . Luz. 3.I.2008. O. Peres Filho’.

Diagnosis

P. barretoi sp. nov. is most similar to P. costalimai but can be separated from it by the shape of the parameres: base of parameres wider in lateral view and apices wider in dorsal view. Also, all examined specimens of P. costalimai have distinct small lateral teeth on parameres while in P. barretoi sp. nov. these teeth are indistinct.

Description

Holotype, male ( Figure 1 (a)).

Body length 8.1 mm. Colour uniformly brown.

Anterior frontoclypeal process relatively long, narrower than head, widely sinuate medially, with symmetric, narrowly rounded lateral lobes.

Pronotum almost as wide as elytra, deeply excavated in middle. Lateral pronotal processes depressed, somewhat ridge-shaped, their hind margins with carinae reaching base of pronotum. Pronotum coarsely punctate to rugose except for very apices of lateral pronotal processes. Punctation of anterior part of pronotum sparser than on disc and especially on lateral sides.

Aedeagus with parameres relatively long: ratio phallobase width/paramere width 2.2 ( Figure 2 (f)). Base of parameres relatively wide in lateral view. Endophallus with a group of spinules ( Figure 2 (h)). Apices wide in dorsal view and acute in lateral view ( Figure 2 (g)).

Female differs from male in having a distinct protibial spur, relatively smaller pronotum without processes and excavations, and in the absence of the frontoclypeal process ( Figure 2 (b)).

Variation

Body length of the paratypes varies from 6.0 to 8.0 mm (males) and from 6.0 to 7.0 (females). Most of the paratypes have less developed anterior frontoclypeal and pronotal processes ( Figure 2 (c–e)) than the holotype.

Distribution

The species is known from one locality in Amazonian forest region in northern Mato Grosso, Brazil ( Figure 7 ).

Etymology

The species is named after Prof. Dr Marliton Rocha Barreto, collector of a part of the type series.

Figures

Figure 1. Paraegidium monneorum, holotype male. Habitus in dorsal view (a); endophallus (b); aedeagus in lateral view (c); parameres in dorsal view (d).

Figure 2. Paraegidium barretoi holotype male (a); paratype female (b); paratype males (c–h). Habitus in dorsal view (a, b); pronotum and head (c–e); aedeagus in lateral view (f); parameres in dorsal view (g); endophallus (h).

Figure 7. Paraegidium spp. locality map.