Pygodiscodon apicicornis ( Pic, 1910 )

Biffi, Gabriel & Constantin, Robert, 2018, Taxonomic revision of Pygodiscodon (Coleoptera: Cantharidae), Acta Entomologica Musei Nationalis Pragae 58 (1), pp. 77-90 : 80-81

Pygodiscodon apicicornis ( Pic, 1910)

( Figs 1 , 7 , 17–19 , 35 , 41–43 )

Discodon apicicorne Pic, 1910: 43 (original description). DELKESKAMP (1939): 155 (catalogue); BLACKWELDER (1945): 364 (catalogue); DELKESKAMP (1977): 246 (catalogue).

Pygodiscodon apicicorne : CONSTANTIN (2010b): 12 (faunistics), CONSTANTIN(2017): 64 (key).

Type locality. French Guiana, St Laurent du Maroni, fixed by the present lectotype designation.

Type material examined. Discodon apicicorne Pic, 1910: LECTOTYPE:, present designation: ‘ Guyane Française | St Laurent | du Maroni || collection Le Moult || Discodon apicicorne n sp [handwritten] || type [handwritten]’ ( MNHN). PARALECTOTYPES: 1 ♀, ‘ Guyane Française | Nouveau Chantier || collection Le Moult’ ( MNHN); 1 ♀, ‘Charvein, Guyane Fr. [handwritten]’ ( MNHN).

Additional material examined. GUYANA: Mazaruni (Clearing), 23.viii.1937, 1; 28.viii.1937, 1; 20.ix.1937, 1, Richards & Smart leg. ( BMNH, 1937-776); 2 nd Growth (Low Forest), 19.viii.1937, 1, Richards & Smart leg. ( BMNH, 1937-776); Kaieteur (Savannah), 5.ix.1937, 1, Richards & Smart leg. ( BMNH, 1937-776); Essequibo River (1 st Falls), 4.x.1929, 1, Oxf. Univ. Exped. leg. ( BMNH, 1929- 485); Kartabo, vi.1922, 1, M. D. Haviland leg., d.d. Collegium Newnhamense ( BMNH, 2012-16). SURINAME: CORONIE: Tottnes (nr airstrip) [5.883369, -56.314974], 9.vi.1963, 1, J & E v d Vecht-B leg.( RMNH); Moengo [5.607838, -54.399491], 10.iv.1939, 1, Geijskes leg.( RMNH); Onverwacht, Biliton [5.605469, -55.140245], 29.xi.1968, 1, 1.xii.1968, 1 P. H. v Doesburg Jr. leg. ( RMNH); Republiek, 6.–11.v.1963, 1, P. H. v Doesburg Jr.leg. [5.494946, -55.206944] ( RMNH), 6.–16.v. 1963, 3 2 ♀♀, J & E v d Vecht-B ( RMNH); [ 5.495459, -55.206514] v.1963, 1 ♀ (Malaise-trap), J. v d Vecht leg. ( RMNH); Copieweg, nr Lelydorp, 28.vii.1978, 1, A. van Assen [5.666669, -55.233331] ( RMNH). FRENCH GUIANA: Réserve Trésor, 04°36 ′ 37.6 ″ N, 52°16 ′ 44.5 ″ W, cca 225 m, xii.2009 8 (window trap), S. Brûlé leg. ( BMNH, 2010- 62); Montagne des Chevaux, 6 km W of Roura, 4°43 ′ N, 52°25 ′ W, 93 m, 6.vi.2009, 1 (window trap), S. Brûlé, P. Dalens & E. Poirier leg. ( MZSP, 5271); Station Nourages, saut Pararé, 4°01 ′ N, 52°41 ′ W, 120 m, 23.xi.2009, 1 ♀ (window trap), P. H. Dalens, S. Brûlé & E. Poirier leg. ( MZSP, 5272); 4°02 ′ 16.1 ″ N, 52°40 ′ 21.1 ″ W, x.2009, 1 ♀ (window trap), S. Brûlé leg, ( BMNH, 2010-62).

Additional published records. FRENCH GUIANA: Haute-Camopi, Mont Saint-Marcel 2°23 ′ 03 ″ N, 53°00 ′ 37 ″ W ( CCO); Mana,Angoulême, 5°24 ′ N, 53°39 ′ W ( CCO); Maripa-Soula-Massif de Mitaraka, camp de base, 2°14 ′ 1 ″ N, 54°27 ′ 38 ″ W, 300 m a.s.l. ( MNHN, CCO); Maripa-Soula, Mont Tabulaire Itoupé, 3°01 ′ 20 ″ N, 53°05 ′ 41 ″ W, 600 m a.s.l., ( CCO); Matoury, Mont Grand-Matoury, 4°51 ′ N, 52°21 ′ W ( CCO); Saint-Elie, Réserve de la Trinité, savane-roche de la Haute-Koursibo, 4°19 ′ N, 53°17 ′ W ( CCO); Saint-Laurent du Maroni, village Espérance, 5°25 ′ N, 54°03 ′ W ( CCO); Saül, belvédère de la Montagne Pelée, 3°37 ′ 22 ″ N, 53°12 ′ 57 ″ W ( CCO). All published by CONSTANTIN (2010b).

Description. Body length: 5.1–6.7 mm. Head black, dark brown behind eyes; 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 ventrally and antennomeres IX–X and base of XI yellowish-white. Pronotum pale yellow with wide medial black patch stretching longitudinally from anterior to posterior margins. Elytra, thorax and abdomen dark brown; legs light brown, darker from middle of tibiae.

Male ( Fig. 1 ): 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. 7 ) long, slightly serrate and compressed dorso-ventrally; dorsal surface of antennomeres IV to VI with irregular longitudinal line, not straight, varying in length and width. 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 brownish setae; each elytron 4.5 times longer than wide. Legs slender; tarsomeres increasing in size from pro- to metathoracic legs; inner claw of prothoracic legs broadly lamellate at base; meso- and metathoracic tarsal claws with sharp protruding tooth. Last abdominal ventrite ( Fig. 17 ) bilobed, broadly rounded posteriorly; abdominal tergite VIII ( Figs 17–19 ) elongate, with shallow latero-posterior compressions and strongly constricted posteriorly, forming narrow apical projection bearing two contiguous glandular openings at apex; dorsal surface of apical projection with pair of parallel ridges and short median tooth. Aedeagus ( Figs 41–43 ): ventral wall of tegmen long and broad, lateral sides slightly convergent, apical margin rounded; short setae along lateral and apical margins and in narrow longitudinal fringe ventrally; parameres long, surpassing dorsal margins of tegmen; apex obtuse, bearing a few long setae; median lobe broad and membranous; internal sac short, partially exposed beyond median lobe, with two pairs of sclerites; ventral sclerites laterally flattened, apex rounded with tip pointing dorso-laterally; dorsal sclerites long, slender, dorsally curved, apex rounded.

Female: similar to male but antennae lacking longitudinal lines; pronotum not notched laterally; tarsal claws simple; abdominal ventrite VII ( Fig. 35 ) 1.9 times wider than long, not divided, lateral margins arched, distal margin with small projecting tip; abdominal tergite VIII broad and simple.

Differential diagnosis. Similar to P. obscurus and P. similis sp. nov. in colour pattern. Elytra and pronotal patch darker; last abdominal tergite of males narrower with pair of dorsal longitudinal ridges culminating in small, acute, upwards-pointing tooth.

Distribution. Guyana, Suriname and 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.