Desmopachria manus, 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 : 34

Desmopachria manus sp. nov.

( Fig. 1 )

Diagnosis. Clypeus indistinctly beaded; antennomeres V and VI lobated. Pronotum without basal striae and lateral beads. Elytron yellow with one brown humeral macula and three brown longitudinal fascia; one sutural, one mesal joining the sutural near base of the elytron and another submarginal joining the mesal near apex ( Fig. 1 a). Posterior half of last abdominal ventrite densely beset with long pale setae ( Fig. 1 b). Aedeagus apex bifid, each branch with one short subapical projection on the internal edge. Parameres wide, with thinner and truncated apex; in dorsal view with flat and articulated subapical projections, emerging from depressions ( Figs 1 c–e).

Description. Holotype male: total length 1.44 mm; maximum width 0.96 mm; elytral length 0.96 mm; maximum width of the pronotum 0.80 mm.

Body rounded. Head inconspicuously punctate; clypeus indistinctly beaded; antennae with rounded scape, pedicel narrower and longer than flagellomeres, antennomeres V and VI lobate. Pronotum short and wide, very fine and inconspicuously punctate, basal striae and lateral beads absent; prosternal process small and setiform; metasternum, metacoxae and abdomen with scattered fine punctures. Tarsi pentamerous without modification. Elytron with very fine and obscure punctures. Abdominal ventrite II with long mesal seta; posterior half of last abdominal ventrite densely beset with long pale setae ( Fig. 1 b). Aedeagus covered by parameres with exception of apex; apex bifid, each branch with one short subapical projection at internal edge. Paramere wide, with thin and truncated apex; in dorsal view with flat and articulated subapical projections, emerging from depressions ( Figs 1 c–e).

Coloration. Head yellow. Pronotum yellow with a pair of dark brown maculae at base. Elytron yellow with one brown humeral macula and three brown longitudinal fascia; one sutural, one mesal joining sutural near base of elytron and one submarginal joining mesal near apex ( Fig. 1 a). Ventral surface light brown.

Variation. Body measurements variable in total length 1.38–1.52 mm; maximum width 0.96–1.06 mm; elytral length 0.96–1.12 mm; maximum width of pronotum 0.74–0.80 mm.

Type-material. Holotype ♂ INPA (Coleop Holotipo INPA 306): Brasil, Amazonas, Codajás, Urucurizinho, Lago Cuxuará, 15/09/2003, -3,97121, -61,96065, Nessimian J. L. & Hamada N. Paratypes - INPA (Coleop Paratipo INPA 306 [1-203]) 203 ind., Brasil, Amazonas, Codajás, Urucurizinho, Lago Cuxuará, 15/09/2003, -3,97121, -61,96065, Nessimian J. L. & Hamada N.; DZRJ: ( Coleoptera 2212 ) 9 ind., Brasil, Amazonas, Tefé, São Francisco da Boca da Capivara, Barra do Solimões, 09/09/2003, -3,28228, - 64,62169, Nessimian J. L. & Hamada N.; DZRJ: ( Coleoptera 2216 ) 27 ind., Brasil, Amazonas, Tefé, São Francisco da Boca da Capivara, Igarapé, 09/09/2003, -3,36102, -64,67915, Nessimian J. L. & Hamada N.; DZRJ: ( Coleoptera 2218 ) 18 ind., Brasil, Amazonas, Anamã, Boa Esperança, Lago Bom Jesus, 16/09/2003, - 3,65812, -61,49109, Nessimian J. L. & Hamada N.;DZRJ: ( Coleoptera 2222 ) 13 ind., Brasil, Pará, Santarém, Santana do Ituqui, Lago Maicá, 30/09/2003, -2,51221, -54,32885, Ferreira-Jr N. & de Marco P.

Etymology. The specific epithet is the Latin substantive manus meaning “hands” referring to the appearance of the apex of the aedeagus, which in dorsal view resembles the silhouette of two hands.

Taxonomic notes. This new species belongs to the convex group sensu Miller (2001) in having the subapically articulated projections on the parameres. The colour pattern is similar to the next new species, but can be distinguished by the presence of maculae at the base of the pronotum, by the absence of lateral pronotum beads, and by larger size. The male genitalia are similar to D. signatoides Miller and to the second new species described below, especially in the position of the paramere projections. However, the aedeagus, parameres and the form of their projections differ from that species.

Figures

FIGURES 1 – 2. 1) Desmopachria manus sp. nov. 2) D. varzeana 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.