Desmopachria varzeana, 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: 36

publication ID

http://doi.org/ 10.5281/zenodo.204762

persistent identifier

http://treatment.plazi.org/id/DD0FB428-FFD4-FFE9-FF06-0A9E4A5D4AC6

treatment provided by

Plazi

scientific name

Desmopachria varzeana
status

sp. nov.

Desmopachria varzeana  sp. nov.

( Fig. 2View FIGURES 1 – 2. 1)

Diagnosis. Antennomeres V –VII lobate. Pronotum with fine lateral margins. Elytron yellow with brown maculae and fasciae; one humeral macula, one large mesal macula on the sutura and one subapical macula, one transverse fascia at base, one sutural fascia, one mesal joining sutural near base of elytron and one submarginal joining mesal near apex ( Fig. 2View FIGURES 1 – 2. 1 a). Venter light brown, with metaesternal and coxae darker; half of last abdominal ventrite densely beset with long, pale setae ( Fig. 2View FIGURES 1 – 2. 1 b). Aedeagus reaching one-third length of parameres, apex bifid. Parameres, in dorsal view, elongate, wide basally and narrowing apically, apex pointed directly outward; with digitiform projection articulated subapically; in ventral view, one row of setae in apical half and few setae on inner margin near apex ( Figs 2View FIGURES 1 – 2. 1 c –e).

Description. Holotype male: total length 1.20 mm; maximum width 0.86 mm; elytral length 0.77 mm; maximum width of pronotum 0.70 mm.

Body rounded. Head inconspicuously punctate; clypeus indistinctly beaded; antennae with scape rounded, pedicel narrower and longer than flagellomeres, antennomeres V and VII lobate. Pronotum short and wide, very fine and inconspicuously punctate, lateral bead very narrow; prosternal process small and setiforme; metasternum, metacoxae, and abdomen with little, scattered, fine punctures. Tarsi pentamerous without modifications. Elytron very fine and obscurely punctate; half of last abdominal ventrite densely beset with long, pale setae ( Fig. 2View FIGURES 1 – 2. 1 b). Aedeagus reaching one-third length of parameres, apex bifid. Parameres, in dorsal view, elongate, wide basally and narrowing apically, apex directed laterally; with digitiform projection articulated subapically; in ventral view, one row of setae in apical half and few setae on inner margin near apex ( Figs 2View FIGURES 1 – 2. 1 c –e).

Coloration. Head and pronotum yellow. Elytron yellow with brown maculae and fasciae; one humeral macula, one large mesal macula near suture and one subapical macula, one transversal fascia at base, one sutural fascia, one mesal joining the sutural near base of elytron and one submarginal joining mesal near apex ( Fig. 2View FIGURES 1 – 2. 1 a). Venter light brown, metasternal and coxae darker.

Variation. Body measurements variable in total length 1.18–1.28 mm; maximum width 0.80–0.86 mm; elytral length 0.77–0.80 mm; maximum width of pronotum 0.67–0.70 mm. Coloration, maculae and fasciae variable, some specimens lighter and maculae and fasciae joined as large cruciform macula.

Type-material. Holotype ♂ (Coleop Holotipo INPA 307): Brasil, Amazonas, Paraná da Trindade, Lírio do Vale, Lago do Albano, 24/09/2003, -2,41418, -57,49993, Ferreira-Jr N. & de Marco P. Paratypes - INPA (Coleop Paratipo INPA 307 [1-130]) 130 ind., Brasil, Amazonas, Paraná da Trindade, Lírio do Vale, Lago do Albano, 24/09/2003, -2,41418, -57,49993, Ferreira-Jr N. & de Marco P.; DZRJ: ( Coleoptera  2223) 5 ind., Brasil, Amazonas, Santo Antônio do Içá, Vila Presidente Getúlio Vargas, Lago do Espanhol, 04/09/2003, - 3,12291, -67,97323, Nessimian J. L. & Hamada N.; DZRJ: ( Coleoptera  2224) 3 ind., Brasil, Amazonas, Jutaí, São Raimundo, Lago do Bosco, 06/09/2003, -2,68867, -66,87529, Nessimian J. L. & Hamada N.; DZRJ: ( Coleoptera  2225) 1 ind., Brasil, Amazonas, Fonte Boa, Fonte Boa, Lago Ressaca Grande, 08/09/2003, - 2,47399, -66,15474, Nessimian J. L. & Hamada N.; DZRJ: ( Coleoptera  2226) 1 ind., Brasil, Amazonas, Tefé, São João do Catuaí, Lago da Piranha, 11/09/2003, -3,62524, -64,18968, Nessimian J. L. & Hamada N.; DZRJ: ( Coleoptera  2227) 1 ind., Brasil, Amazonas, Coari, Vila de Trocaris, Lago Baracari, 13/09/2003, -3,91631, - 62,86139, Nessimian J. L. & Hamada N.; DZRJ: ( Coleoptera  2228) 46 ind., Brasil, Amazonas, Anamã, Boa Esperança, Lago Bom Jesus, 16/09/2003, -3,65812, -61,49109, Nessimian J. L. & Hamada N.; DZRJ: ( Coleoptera  2229) 46 ind., Brasil, Amazonas, Manacapuru, Cristo Ressuscitado, Lago Galo (Camoa), 17/09/ 2003, -3,57995, -60,82906, Nessimian J. L. & Hamada N.; DZRJ: ( Coleoptera  2230) 7 ind. Brasil, Amazonas, Itacoatiara, Ilha da Trindade, Paraná da Trindade, 22/09/2003, -3,31345, -58,73231, Ferreira-Jr N. & de Marco P.

Etymology. The specific epithet refers to the place of origin of the type material, the Amazon river floodplain or Várzea.

Taxonomic notes. This new species belongs to the convex group sensu Miller (2001) in having subapically articulated projections on the parameres. This new species has similar characteristics to other sympatric species of this group, D. manus  sp.nov., D. pilosa Miller  , D. signata Zimmermann  and the following newly-described species ( D. cavia  sp. nov.). The colour pattern of the elytron is similar to D. manus  , but D. varzeana  lacks maculae on the base of the pronotum. Additionally, D. varzeana  is smaller than D. manus  and has the pronotum margined. The male genitalia of D. varzeana  are similar to D. pilosa  , D. signata  and to the next newly-described species. However D. varzeana  differs from D. pilosa  in having the aedeagus with the apex bifid, and from D. signata  in having the length of the aedeagus more than half the length of the paramere. D. varzeana  differs the from following newly-described species in having the paramere with the apex pointed, the absence of grooved areas at the base of the projections, a different colour pattern on the elytron and smaller size.

INPA

Instituto Nacional de Pesquisas da Amazonia