Desmopachria nigrisphera, 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 : 11

publication ID

https://doi.org/ 10.11606/1807-0205/2018.58.41

DOI

https://doi.org/10.5281/zenodo.5235477

persistent identifier

https://treatment.plazi.org/id/6B529B6D-EA1E-FFF6-9407-FF3BFBAAFBB1

treatment provided by

Felipe

scientific name

Desmopachria nigrisphera
status

sp. nov.

Desmopachria nigrisphera sp. nov.

( Figures 6 View Figures A-K)

Diagnosis: Medium size for the genus 1.8 mm; body very rounded, shiny black with dense punctures ( Fig. 6A View Figures ). Male median lobe in dorsal view straight parallel-sided with apex rounded ( Fig. 6J View Figures ) with almost the same length than lateral lobes ( Fig. 6D View Figures ).

Description: Holotype male: total length 1.8 mm; maximum width of body 1.3 mm; elytral length 1.2 mm; maximum width of the pronotum 0.9 mm.

Colouration ( Figs. 6 View Figures A-C): Dorsal view shiny black with exception of the brown inner margin of pronotum ( Figs. 6 View Figures A-B); venter shiny black with exception of head, prosternum and legs testaceous ( Fig. 6C View Figures ).

Structure and sculpture: Body very rounded. Head with fine and shallow scarcely distributed punctures; pronotum with fine and shallow scarcely distributed punctures and course and deep punctures near base and in a line parallel the apical margin; elytral surface with fine and shallow densely distributed punctures and a line of fine and deep punctures in disc. Clypeus beaded; antennae with rounded scape, pedicel narrower and longer than others antennomeres, antennomeres 5-9 slightly expanded in apical half. Pronotum short and wide, with a lateral bead and without basal striae. Elytral suture margined. Prosternal process apically strongly forked, area between rami forming a deep pit; ventral surface of metatibia covered with short and wide spines. Ventral surface inconspicuous punctuated. Apical ventrite smooth without sutures or marks.

Male genitalia ( Figs. 6 View Figures D-K): Median lobe with almost the same length than lateral lobes ( Figs. 6 View Figures D-G). in dorsal view straight parallel sided apex rounded ( Fig. 6I View Figures ); in lateral view base bilobed and well separated of rest of median lobe, remainder of lobe straight until narrow apical quarter, apex rounded ( Fig. 6J View Figures ). Lateral lobes in dorsal view triangular shape with a dense row of setae on inner margin of apical third ( Fig. 6H View Figures ); in lateral view basal and middle straight almost rectangular, apical third narrowing and bended to inner side ( Fig. 6K View Figures ).

Intraspecific variation: Total length 1.8 mm; maximum width of body 1.1-1.2 mm; elytral length 1.3-1.4 mm; maximum width of the pronotum 0.9-1.0 mm.

Type material: Holotype male:“ Brasil, São Paulo, São José do/ Barreiro, Lajeado , Córrego da/ Floresta , Cachoeira do Paredão / 22°43’33”S, 44°37’18”W, / 1540 m, 17.xi.2012, Souto PM,/ Ferreira-Jr N, Silveira LFL &/ Gil-Azevedo LH, BOC13 View Materials [paper white label]”, “5957 [plastic blue label]” “ HTYPE [plastic red label]” ( DZRJ) GoogleMaps . Paratypes: “ Brasil, São Paulo, São José do/ Barreiro, Lajeado, Córrego da/ Floresta, Cachoeira do Paredão/ 22°43’33”S, 44°37’18”W, / 1540 m, 17.xi.2012, Souto PM,/ Ferreira-Jr N, Silveira LFL &/ Gil-Azevedo LH, BOC 13 [paper white label]”, “5958 [plastic blue label]”, “ PTYPE [plastic red label]” (3 exs.) ( DZRJ).

Taxonomic notes: This new species belongs to the D. portmanni group sensu Miller (2001) in having the prosternal process sexually dimorphic. Although dark dorsal colouration is very common in the portmanni group,most species have small differences in tonality between the head, pronotum, elytrum and ventral surface, only D. grandnigra Braga & Ferreira-Jr., 2014 and D. nigra Zimmermann, 1923 , have a dorsal surface equally dark in all tagma. These two species both have a dorsal surface almost impuctate giving a vitreous aspect which is absent in the new species. Desmopachria bryanstoni Clark, 1862 , D. pittier Young, 1995 D. zetha Young, 1995 and D. goias Young, 1995 have male genitalia which are similar in shape to Desmopachria nigrisphera sp. nov. but the former three species are bigger in body size.

Etymology: The specific name is a combination of the Latin adjective “nigra” meaning dark and the substantive “sphere” meaning ball, referring to the colour and shape of this species.

Geographic distribution: So far known only from the São Paulo State of Brazil.

PM

Pratt Museum

BOC

Bingham Oceanographic Collection

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Dytiscidae

Genus

Desmopachria