Desmopachria francischettii, Braga, 2018

Braga, Rafael Benzi, 2018, Six new species and new records of the genus Desmopachria Babington (Coleoptera: Dytiscidae: Hyphidrini) from Brazil and redescription of D. varians Wehncke, 1877, Papéis Avulsos de Zoologia 58, pp. 1-15 : 4-7

Desmopachria francischettii sp. nov. ( Figures 3 A-K)

Diagnosis: Large size for the genus 2.4 mm. Each elytron testaceous with two transversally dark brown fasciae ( Fig. 3B ). Median lobe in dorsal view with middle third straight and apical third narrowed, apex truncated ( Fig. 3I ), in lateral view with apical half thin and waved ( Fig. 3j ). Lateral lobe robust in both view, in lateral view lateral lobe triangular shaped ( Figs. 3H, L ).

Description: Holotype male: total length 2.4 mm; maximum width of body 1.7 mm; elytral length 1.7 mm; maximum width of the pronotum 1.2 mm.

Colouration ( Figs. 3 A-C): Head testaceous; pronotum testaceous with dark brown base; ventral surface testaceous ( Fig. 3A ); elytron testaceous with two irregular transversal dark brown fasciae one in the middle of elytron and other near the apex ( Fig. 3b ). Ventral surface reddish brown ( Fig. 3C ).

Structure and sculpture: Body very rounded. Head and pronotum with very fine, shallow and scarcely distribut- ed punctures; elytral surface with very fine, shallow and dense punctures, a line of shallow punctures along the elytral suture, it coarse puctures near the elytral base and smaller punctures along the elytral length. Clypeus truncated; antennae with rounded scape, pedicel narrower and longer than others antennomeres, antennomeres 5-9 slightly expanded in apical half. Pronotum short and wide, with lateral bead and without basal striae. Prosternal process broad, apically rounded, shallowly concave. Apical ventrite smooth without sutures or marks.

Male genitalia ( Figs. 3 D-K): Median lobe of aedeagus in dorsal view with basal third broad, middle third straight and apical third narrow, apex truncated ( Fig. 3I ); in lateral view with basal half broad, almost triangular and apical half thin and waved ( Fig. 3J ). Lateral lobe robust in both view, in dorsal view almost rectangular narrow gently to rounded apex, presence of a few long setae on the apex and outer margin ( Fig. 3H ); in lateral view lateral lobe triangular ( Fig. 3K ).

Intraspecific variation: Total length 2.3-2.5 mm; maximum width of body 1.7 mm; elytral length 1.7 mm; maximum width of the pronotum 0.9-1.0 mm.

Type material: Holotype male: “ Brasil, Minas Gerais, Paula Candido,/ Córrego dos Barros, Veg./ Marginal / 20°50’37”S, 49°55’32”W / 19.ix.2004, Francischetti/ C.N.& Salles F., 686 m [paper white label]”, “5952 [plastic blue label]” “ HTYPE [plastic red label]” ( DZRJ) . Paratypes: “ Brasil, Minas Gerais, Paula Candido,/ Córrego dos Barros, Veg./ Marginal/ 20°50’37”S, 49°55’32”W / 19.ix.2004, Francischetti/ C.N.& Salles F., 686 m [paper white label]”, “5953 [plastic blue label]”, “ PTYPE [plastic red label]” (6 exs.) ( DZRJ).

Taxonomic notes: This species best fits in the D. glabricula group sensu Miller (2001) since it has the characteristic sclerotized lateral lobe, however the genitalia is very simple without folds in the lateral lobe, a bifurcated and/ or ornate male median lobe, which is present in other species of the group. Therefore, the genitalia of the new species is deviating compared to other species in the group.

Etymology: The specific name is an homage to Dr. Cesar Francischetti, one of the collectors of material.

Geographic distribution: So far known only from the Minas Gerais State of Brazil.

Figures

Figures 3A-K. Desmopachria francischettii. (A) Dorsal View.(B) Colour pattern of elytron. (C) Ventral view. (D-K) Male genitalia. (D) Dorsal view. (E) Ventral view. (F) Lateral view. (G) Coverslip dorsal view. (H) Lateral lobe dorsal view. (I) Median lobe dorsal view. (J) Median lobe lateral view. (K) Lateral lobe lateral view. Figs.3A-C scale bars = 1 mm, Figs.3D-Kscale bars = 0.1 mm.