Desmopachria carranca, 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

Desmopachria carranca sp. nov.

( Figures 2 A-L)

Diagnosis: Large size for genus 2.3-2.4 mm; head testaceous, pronotum testaceous with dark brown macula on base ( Fig. 2A ), each elytron testaceous with diffused dark brown macula on disk ( Fig. 2B ); male median lobe of aedeagus smaller than lateral lobes and in dorsal view narrowing and apex truncated with a small reentrancy in middle ( Figs. 2G, I ).

Description: Holotype male: total length 2.4 mm; maximum width of body 1.6 mm; elytral length 1.6 mm; maximum width of the pronotum 1.3 mm.

Colouration ( Figs. 2 A-C): Head testaceous; pronotum testaceous with dark brown macula on base; each elytron diffused dark brown in disk and testaceous in base and lateral. Venter testaceous.

Structure and sculpture: Body rounded, dense punctuation; head and pronotum with fine, shallow punctures on dorsal surface, ventral surfaces inconspicuously punctuated; elytral with fine, deep punctures on dorsal surface, line of broad, shallow punctures along elytral suture margin. Clypeus slightly up-turned; 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; elytral suture margined; prosternal process strongly forked apically, area between rami forming a deep pit.Ventral surface of metatibia covered with short and wide spines. Apical ventrite smooth without sutures or marks.

Male genitalia ( Figs. 2 D-K): Median lobe of aedeagus one quarter shorter than lateral lobes ( Fig. 2G ); in dorsal view triangular shaped,narrowing toward, apex truncated with a small medial notch ( Fig. 2I ); in lateral view narrowing toward apex,bended in half-length to dorsal side,apex spoon like ( Fig. 2H ). Lateral lobes in dorsal view triangular with a dense row of setae on inner margin of apical third ( Fig. 2H ); in lateral view basal third expanded, middle and apical thirds straight gently narrowed to apex ( Fig. 2L ).

Intraspecific variation: Total length 2.3-2.4 mm; maximum width of body 1.6-1.7 mm; elytral length 1.6-1.7 mm.

Type material: Holotype male: “ Brasil, Minas Gerais, Itabirito, Vale/ dos Tropeiros, Cachoeira da/ Carranca,/ 20°01’26”S, 43°38’39”W,/ 10.x.2010, Ferreira-Jr N.,/ 996 m [paper white label]”, “5959 [plastic blue label]” “ HTYPE [plastic red label]” ( DZRJ) . Paratypes:“ Brasil, Minas Gerais, Itabirito, Vale/ dos Tropeiros, Cachoeira da/ Carranca./ 20°12’26”S, 43°38’39”W / 10.x.2010 Ferreira-Jr N./ 996 m [paper white label]”, “5960 [plastic blue label]”, “ PTYPE [plastic red label]” (22 exs.) ( DZRJ).

Taxonomic notes: This new species belongs to the D. portmanni group sensu Miller (2001) in having the prosternal process sexually dimorphic among the species of this group and for its median lobe shorter than lateral lobes. The new species is comparable with D. aurea Young 1980 , D. specula Sharp 1887 , D.variegata Sharp 1882 and D. ukuki Braga & Ferreira-Jr., 2014, but all these are smaller in body size. D. carranca sp. nov. is similar in size to D. itamontensis Braga & Ferreira-Jr., 2014, D. undulatosterna Braga & Ferreira-Jr., 2011 and D. zetha Young 1995 , but all these species have different colour pattern. Moreover D. itamontensis and D. undulatosterna share conspicuous large punctuations, absent in D. carranca sp. nov., whereas D. zetha has a median lobe in dorsal view straight not triangular in shape, ending in a round- ed apex without an apical notch.

Etymology: The specific name refers to the Carranca falls, where the type material of this species has been collected. It is a female noun in the nominative singular.

Geographic distribution: Known only from the Minas Gerais State of Brazil.

Figures

Figures 2A-K. Desmopachria carranca. (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.2A-C scale bars = 1 mm,Figs.2D-K scale bars= 0.1 mm.