Desmopachria yanomami, 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 : 7-9

Desmopachria yanomami sp. nov.

( Figures 4 A-L)

Diagnosis: Small size for the genus 1.3-1.4 mm. Male median lobe triangular ( Fig. 4 J-K); Lateral lobe with the apical half divided in two flat and broad ramus; dorsal rami short and less wide, ventral rami with a apex truncated and a tuft of small setae near of outer angle ( Fig. 4I ).

Description: Holotype male: total length 1.4 mm; maximum width of body 0.9 mm; elytral length 0.9 mm; maximum width of the pronotum 0.3 mm.

Colouration ( Figs. 4 A-C): Head yellow; pronotum yellow with base dark brown; each elytron dark brown with scattered yellow maculae in laterals ( Figs. 4 A-B). Venter yellow ( Fig. 4C ).

Structure and sculpture: Body rounded. Head and pronotum with very fine, shallow scarcely distributed punctures; each elytron with very fine, shallow and densely distributed punctures. Anterior clypeal margin thin, translucent and up-turned; Antennae with very rounded scape longer than two antennomeres united, pedicel narrower with same length of scape, 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. Elytral suture without margin. Ventral surface of metatibia covered with short and wide spines. Apical ventrite with a very fine transversal line ( Fig. 4D ).

Male genitalia ( Figs. 4 E-L): Median lobe in dorsal view narrowing toward to pointed apex ( Fig. 4J ); in lateral view almost triangular with a convexity on ventral margin of base ( Fig. 4K ). Lateral lobe with the apical half divided in two flat and broad rami ( Figs. 4 F-H), dorsal rami short and less wide, ventral rami with a apex truncated and a tuft of small setae near of outer angle ( Fig. 4I ); in lateral view lateral lobe almost triangular shaped slight bended to ventral side ( Fig. 4L ).

Intraspecific variation: Anterior clypeal margin sexually dimorphic, beaded in female and not conspicuously translucent. Total length 1.3-1.4 mm; maximum width of body 0.9-1.0 mm; maximum width of the pronotum 0.8-1.0 mm.

Type material: Holotype male: “ Brasil, Amazonas , Barcelos,/ Igarapé do Tabocal,/ 00°00’57”S, 62°48’38”W,/ 08.viii.2009, Ferreira-Jr N. & Nessimian, J.L., AJ17 [paper white label]”, “5955 [plastic blue label]” “ HTYPE [plastic red label]” ( DZRJ) . Paratypes: “ Brasil, Amazonas, Barcelos,/ Igarapé do Tabocal,/ 00°00’57”S, 62°48’38”W,/ 08.viii.2009, Ferreira-Jr N. & Nessimian, J.L., AJ 17 [paper white label]”, “5956 [plastic blue label]”, “ PTYPE [plastic red label]” (35 exs.) ( DZRJ).

Taxonomic notes: This new species belongs to the D. ubangoides group sensu Miller (2001) having the anterior clypeal margin sexually dimorphic, males being strongly modified, thin, translucent and strongly upturned, and being anteriorly beaded in the female. This species is near D. minuta Young 1980 in colour pattern and in the shape of the genitalia, but can be separated from it by the bigger size, presence of transversal suture on last sternite, a character only shared in this group with D. ubangoides , and the apex of the male median lobe being pointed instead of bifurcated and dorsal rami of lateral lobe are broad instead of slender.

Etymology: The species name refers to masculine and feminine noun “Yanomâmi”, the name of the indigenous people present in the area of origin of the type material. It is a noun in the nominative singular standing in apposition.

Geographic distribution: Known only from the Amazonas State of Brazil.

Figures

Figures 4A-K. Desmopachria yanomami. (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.4A-C scale bars = 1 mm, Figs.4D-K scale bars = 0.1 mm.