Desmopachria nigrocapitata, Braga, Rafael Benzi & Ferreira-Jr, Nelson, 2010

Braga, Rafael Benzi & Ferreira-Jr, Nelson, 2010, Four new species of Desmopachria Babington (Insecta, Coleoptera, Dytiscidae) from the Amazon river floodplain, Zootaxa 2415, pp. 33-42 : 38-40

Desmopachria nigrocapitata sp. nov.

( Fig. 4 )

Diagnosis. Head black dorsally, antennomeres VI and VII lobate; ventral surface yellow; mouthparts and coxae brown. Pronotum with wide lateral margins, pronotum and elytron brown. Elytron yellow with brown maculae and fasciae; two lateral maculae near apex, sutural fascia continuous reaching the base, with a large brown macula on the disc, lateral fascia discontinuous, joining with discal macula near apex ( Fig. 4 a). Last abdominal ventrite smooth with distinct edge ( Fig. 4 b). Aedeagus with wide and bifid base, apical half gradually narrowed, apex truncate but widened laterally ( Figs 4 c–e). Paramere, in dorsal view, with internal edge undulate, converging near base and with rows of setae rounded at apex ( Fig. 4 c); in ventral view, basal half large joining to other side, apical half thin with apex rounded with setae ( Fig. 4 d).

Description. Holotype male: total length 1.44 mm; maximum width 0.96 mm; elytral length 0.77 mm; maximum width of pronotum 0.96 mm.

Body rounded. Head inconspicuously punctate; clypeus indistinctly beaded; antennae with round scape, pedicel narrower and longer than flagellomeres, antennomeres VI and VII lobate. Pronotum short and wide, very fine and inconspicuously punctate, wide lateral margins; prosternal process small and setiforme; metasternum, metacoxae and abdomen with small, scattered, fine punctures. Tarsi pentamerous without modifications. Elytron very fine and obscurely punctated. Last abdominal ventrite smooth with distinct edge ( Fig. 4 b). Aedeagus with base wide and bifid and apical half gradually narrowed, apex truncated but widened laterally ( Figs 4 c–e). Parameres, in dorsal view, with internal edge undulating, converging near base and with rows of setae at apex ( Fig. 4 c); in ventral view with basal half large joining to other side, apical half thin with apex rounded, with setae ( Fig. 4 d).

Coloration. Head black dorsally. Pronotum yellow with black base. Elytron yellow with brown maculae and fasciae; two lateral maculae near apex, sutural fascia continuous, reaching the base, with a large brown macula on the disc, lateral fascia discontinuous, joining with discal macula near apex ( Fig. 4 a). Ventral surface yellow; mouthparts and coxae brown.

Variation. The size of the body is not variable. Small variation in the position of the lateral spots and fasciae.

Type-material. Holotype 1 ♂ (Coleop Holotipo INPA 309): Brasil, Amazonas, Santo Antônio do Içá, Vila Presidente Getúlio Vargas, Igarapé, 05/09/2003, -3,11141, -67,96563, Nessimian J. L. & Hamada N.

Paratype - DZRJ: ( Coleoptera 2215 ) 1 ind. Brasil, Amazonas, Santo Antônio do Içá, Vila Presidente Getúlio Vargas, Igarapé, 05/09/2003, -3,11141, -67,96563, Nessimian J. L. & Hamada N.

Etymology. The specific epithet is the Latin adjetive nigro meaning “dark” and capitata meaning “head” referring to the dark coloration of the head, which is uncommon in Desmopachria .

Taxonomic notes. This new species is not placed in any group. The male genitalia possess some similarities with the portmania group sensu Miller (2001) in the curved form of the aedeagus and in the setae of the parameres, however the bifid base of the aedeagus and the absence of bifurcation on the prosternal process excludes it from this group.

Figures

FIGURES 3 – 4. 3) Desmopachria cavia sp. nov. 4) D. nigrocapitata sp. nov. a) Dorsal habitus; b) last visible abdominal ventrite; c) male genitalia, dorsal view; d) male genitalia, ventral view; e) male genitalia, dorsal view with cover slips. Scale in dorsal habitus = 1.0 mm.