Pygodiscodon gurupi, Biffi & Constantin, 2018

Biffi, Gabriel & Constantin, Robert, 2018, Taxonomic revision of Pygodiscodon (Coleoptera: Cantharidae), Acta Entomologica Musei Nationalis Pragae 58 (1), pp. 77-90 : 81-84

Pygodiscodon gurupi sp. nov.

( Figs 2 , 8 , 13 , 20–22 , 36 , 44–46 )

Type locality. Brazil, Maranhão, Bom Jardim, Reserva Biológica do Gurupi.

Type material. HOLOTYPE:, ‘ Brasil (MA), Bom Jardim | REBIO–Res. Biol. Gurupi | Armad. Luminosa Suspensa || 17–27.I.2010, F. Limeira- | de-Oliveira, J. T. Câmara | & O.A. Silva cols. || HOLOTYPE | Pygodiscodon | gurupi | Biffi & Constantin’ ( CZMA). PARATYPES: ‘ Brasil (MA), Bom Jardim | REBIO–Res. Biol. Gurupi | Armad. Luminosa Base || 17–27.I.2010,A.A.T. | Sousa, M. B.Aguiar Neto | & J. O.A. Silva cols. || MZSP 10251 || PARATYPE | Pygodiscodon | gurupi | Biffi & Constantin’ (1 MZSP 10251, 1 CZMA); ‘ Brasil (MA), Bom Jardim | REBIO–Res. Biol. Gurupi | Armad. Luminosa Base ||, 01–05.I.2010, M.M. | Abreu, E. A. S. Barbosa & | A. A. Santos cols. || MZSP 10252 || PARATYPE | Pygodiscodon | gurupi | Biffi & Constantin’ (1 ♀ MZSP 10252).

Description. Body length: 6.1–7.0 mm. Head black; frons, clypeus and base of mandibles light brown to testaceous, slightly translucent; apex of mandibles light brown; palpi dark brown. Antennae black; first antennomere slightly lighter at apex and antennomeres X–XI sometimes light brown to yellowish-brown. Pronotum orange-yellow with wide medial black patch stretching longitudinally from anterior to posterior margins. Elytra dark brown; thorax, legs and abdomen dark brown and apex of tergite VIII reddish-brown.

Male ( Fig. 2 ). Head as long as wide, broadly rounded behind eyes, densely pubescent; occipital region and frons convex; clypeus wide, emarginated anteriorly. Eyes rounded, rather prominent. Maxillary palpi elongate, last palpomere slender and slightly securiform. Antennae ( Fig. 8 ) long, slightly serrate and compressed dorsoventrally; dorsal surface of antennomeres V–XI with narrow, straight and smooth longitudinal line. Pronotum densely pubescent, transverse, 1.6 times wider than long; lateral margins slightly emarginated, explanate upwards and shortly notched before basal angles. Elytra finely rugulose, densely covered with erect greyish setae; each elytron 5.2 times longer than wide. Legs slender; metathoracic coxae ( Fig. 13 ) with unciform backwards-pointing projections; mesothoracic femur arched; tarsomeres increasing in size from pro- to metathoracic legs; inner claw of prothoracic tarsus broadly lamellate at base; meso- and metathoracic tarsal claws with sharp protruding tooth. Last abdominal ventrite ( Fig. 20 ) bilobed, broadly rounded posteriorly; abdominal tergite VIII ( Figs 20–22 ) elongate, conical and strongly constricted posteriorly with broad, elliptical, truncate apical projection bearing two contiguous glandular openings at apex and further setose dorsal flap-like projection. Aedeagus ( Figs 44–46 ): ventral wall of tegmen with two broad, rounded lobes pointing ventrally and centrally with tuft of long setae at apex; parameres dorsally, shorter than median lobe bearing long and thick apical setae; median lobe broad and membranous, shorter than internal sac; internal sac with two pairs of spine-like sclerites; ventral sclerites gradually acute and curved ventrally, protruding slightly beyond apex of tegmen; dorsal sclerites shorter than ventral sclerites, slightly curved dorsally and laterally and bearing preapical lateral tooth.

Female. Similar to male but antennae lacking longitudinal lines; pronotum not notched laterally; tarsal claws simple; abdominal ventrite VII ( Fig. 36 ) 2.4 times wider than long, not divided, lateral margins broadly rounded, distal margin with short and broad projecting tip; abdominal tergite VIII broad and simple.

Differential diagnosis. Colour pattern similar to P. monoceros sp. nov. and P. touroulti . Pygodiscodon gurupi sp. nov. differs in the antennal lines narrow and straight, present on antennomeres VI–XI in males; metathoracic coxae with unciform backwards-pointing projections in males; last abdominal tergite of males with short, broad and truncate projection and flap-like dorsal projection.

Etymology. The specific epithet is a noun in apposition. It is derived from the name of the reserve where the species was collected, an area continuously threatened by land conflicts and illegal agriculture, livestock and timber trading.

Distribution. Brazil: Maranhão ( Fig. 59 ).

Figures

Figs 1–6. Habitus of males of Pygodiscodon species. 1 – Pygodiscodon apicicornis (Pic, 1910); 2 – P. gurupi sp. nov.; 3 – P. monoceros sp. nov.; 4 – P. obscurus Wittmer, 1966; 5 – P. similis sp. nov.; 6 – P. touroulti Constantin, 2010. Scale bars = 2.0 mm.

Figs 7–12. Antennae of Pygodiscodon species (dorsal view). 7 – Pygodiscodon apicicornis (Pic, 1910); 8 – P. gurupi sp. nov.; 9 – P. monoceros sp. nov.; 10 – P. obscurus Wittmer, 1966; 11 – P. similis sp. nov.; 12 – P. touroulti Constantin, 2010. Scale bars = 1.0 mm.

Figs 13–16. Legs and wing of Pygodiscodon species. 13 – Metathoracic coxae, P. gurupi sp. nov. 14–16 – P. obscurus Wittmer, 1966: 14 – Left wing (dorsal view); 15 – Prothoracic tarsal claws; 16 – Mesothoracic tarsal claws. Scale bars: 13 = 0.5 mm; 14 = 1.0 mm; 15–16 = 0.1 mm.

Figs 17–25.Abdominal apex of Pygodiscodon species (ventral, dorsal and lateral views). 17–19 – P. apicicorne (Pic, 1910); 20–22 – P. gurupi sp. nov.; 23–25 – P. monoceros sp. nov. Scale bar = 1.0 mm.

Figs 35–40.Abdominal ventrite VII of females of Pygodiscodon species, ventral view. 35 – Pygodiscodon apicicornis (Pic, 1910); 36 – P. gurupi sp. nov.; 37 – P. monoceros sp. nov.; 38 – P.obscurus Wittmer, 1966; 39 – P. similis sp. nov.; 40 – P. touroulti Constantin, 2010. Scale bars = 0.5 mm.

Figs 41–49. Aedeagi of Pygodiscodon species (ventral, lateral and dorsal views). 41–43 – Pygodiscodon apicicornis (Pic, 1910); 44–46 – P. gurupi sp. nov.; 47–49 – P. monoceros sp. nov. Scale bar = 0.2 mm.

Figs 59–60. Distribution map of Pygodiscodon Wittmer, 1966. 59 – Distribution of Pygodiscodon species in South America; 60 – Distribution of Pygodiscodon species in French Guiana.