Pygodiscodon monoceros, Biffi & Constantin, 2018

Biffi, Gabriel & Constantin, Robert, 2018, Taxonomic revision of Pygodiscodon (Coleoptera: Cantharidae), Acta Entomologica Musei Nationalis Pragae 58 (1), pp. 77-90 : 84-85

Pygodiscodon monoceros sp. nov.

( Figs 3 , 9 , 23–25 , 37 , 47–49 )

Type locality. French Guiana, Maripasoula, Mont Tabulaire Itoupé.

Type material: HOLOTYPE:, ‘ Guyane | Mont Tabulaire-Itoupé | 3°01 ′ 19 ″ N- 53°05 ′ 03 ″ W [provided in WGS84 geodesic system] | alt. 830 m, automatic light trap pink white LED | 1.XII.2014, SEAG, P. H. Dalens, S. Fernandez, E. Poirier leg || HOLOTYPE | Pygodiscodon | monoceros | Biffi & Constantin’ ( MNHN). PARATYPES: ‘ Guyane | Mont Tabulaire-Itoupé | 3°01 ′ 19 ″ N- 53°05 ′ 03 ″ W | alt. 800m, auto-LT Pink LED | 1.XII.2014, SEAG & Dalens || Paratype | Pygodiscodon | monoceros | Biffi & Constantin’ (2 3 ♀♀ MZSP, 5165–5170); [ same locality and collector but] 25.XI.2014, 250W UV light trap, 1 1 ♀ ( CCO); idem, 25.XI.2014, automatic light trap with white LED, 5 1 ♀ (1 MNHN, 5 CCO); idem, 26.XI.2014, automatic light trap with blue LED, 4 1 ♀ (3 MNHN, 2 CCO); idem, 26.XI.2014, automatic light trap with white LED, 1 ♀ ( CCO); idem, 1.XII.2014, automatic light trap with white LED, 3 (2 MNHN, 1 CCO); idem, 1.XII.2014, automatic light trap with blue LED, 1 1 ♀ ( BMNH); idem, 8.I.2016, conventional mercury vapor light trap, 1 ( CCO); idem, 11.I.2016, automatic light trap with GemLight (one green, one UV) LED, 1 1 ♀ ( CCO); idem, 16.I.2016, automatic light trap with blue LED, 1 ( CCO); idem, 16.I.2016, Malaise SLAM, 1 1 ♀ ( CCO); idem, 16.I.2016, Malaise trap #3, length 6 m, 1 3 ♀♀ ( CCO); idem, 16.I.2016, altitude 600m, automatic light trap with white LED, 1 ( CCO); idem, 16.I.2016, altitude 600m, automatic light trap with GemLight LED, 1 ( CCO).

Description. Body length: 6.8–8.2 mm. Head black; frons and clypeus yellow, mandibles brownish-yellow; palpi brown, apex of distal palpomere yellow. Antennae brown, antennomeres X–XI yellow, except base of X and tip of XI. Pronotum orange-yellow with wide medial black patch stretching longitudinally, not reaching posterior margin. Elytra dark brown; thorax, abdomen and legs brown, base of femora reddish-brown.

Male ( Fig. 3 ). Head as long as wide, rounded behind eyes, densely pubescent; occipital region and frons convex; clypeus wide, emarginated anteriorly. Eyes rounded, very prominent. Maxillary palpi elongate, last palpomere slender and slightly securiform. Antennae ( Fig. 9 ) long, serrate and compressed dorso-ventrally; dorsal surface of antennomeres III–X with broad, irregular longitudinal line. Pronotum densely pubescent, transverse, 1.5 times wider than long; lateral margins slightly emarginated, explanate upwards and shortly notched before basal angles. Elytra finely rugous, densely covered with erect greyish setae; each elytron 5.0 times longer than wide. Legs slender; tarsomeres increasing in size from proto metathoracic legs; inner claw of prothoracic tarsus broadly lamellate at base, meso- and metathoracic tarsal claws with sharp protruding tooth. Last abdominal ventrite ( Fig. 23 ) bilobed, truncate posteriorly; last abdominal tergite ( Figs 23–25 ) broadly rounded, with pair of lateral lobes directed posteriorly and apical hood-like projection bearing pair of juxtaposed glandular openings and single terminal slender digitiform projection directed upwards. Aedeagus ( Figs 47–49 ): ventral wall of tegmen long and broad, lateral sides slightly rounded, apical margin truncate with short median incision; parameres slender, longer than median lobe, arched internally, bearing long and thick internal setae; median lobe broad and membranous, much shorter than internal sac; internal sac with robust sclerite divided in spine-like sclerites; ventral sclerite very broad with divided, acute lateral apices; dorsal sclerites curved dorsally and laterally, divided in two strong spine-like projections.

Female. Similar to male but eyes much smaller, not prominent, antennae lacking longitudinal lines; pronotum not notched laterally; tarsal claws simple; abdominal ventrite VII ( Fig. 37 ) 2.1 times wider than long, not divided, lateral margins arched, distal margin with short and broad projecting tip; abdominal tergite VIII broad and simple.

Differential diagnosis. Colour pattern similar to P. gurupi sp. nov. and P. touroulti . Eyes larger and more prominent; antennae longer, antennal lines from antennomeres III–X; last abdominal tergite of males rounded, with slender terminal digitiform projection directed upwards.

Etymology. The specific epithet is a noun in apposition. It recalls the singular character of the horn adorning the apex of the pygidium.

Distribution. French Guiana ( Figs 59–60 ).

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 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.