Alloraphes cayennensis, Jałoszyński, 2020

Jałoszyński, Paweł, 2020, Four new species and new records of the Neotropical genus Alloraphes Franz (Coleoptera: Staphylinidae: Scydmaeninae), Zootaxa 4810 (2), pp. 335-343 : 337-338

Alloraphes cayennensis sp. n.

( Figs 3–4 , 13–16 )

Type material. Holotype: FRENCH GUIANA (commune Cayenne ): ♂, two labels: “Guyane Française / Ca- basson / Ile de Cayenne / N. Degallier XI78” [white, printed and handwritten]; “ Alloraphes / cayennensis m. / P. JAŁOSZYŃSKI, 2020 / HOLOTYPUS ” [red, printed] ( MHNG).

Diagnosis. Male: frons delimited from vertex by diffuse transverse impression; eyes small, in dorsal view width of eye smaller than half width of frons; pronotum with arcuate antebasal transverse groove and indistinct median pit; elytra modified, each elytral apex with distinct round dimple with diffuse margins; aedeagus in ventral view with strongly asymmetrical apex of median lobe; parameral apices in ventral view pointed, in lateral view narrowly rounded, parameres slender, each with weakly marked subapical broadening, all three parameral setae subapical, not thickened.

Description. Body of male ( Fig. 3 ) moderately convex, light brown, covered with yellowish vestiture; BL 0.90 mm.

Head ( Fig. 4 ) broadest at moderately large, strongly convex and moderately coarsely faceted eyes, HL 0.15 mm, HW 0.20 mm; vertex distinctly convex at middle and flattened at sides, delimited from frons by short transverse and diffuse impression, median area of frons in front of eyes flattened; supraantennal tubercles feebly elevated. Punctures on frons and vertex virtually absent; setae short, sparse, and recumbent. Antennae slender, AnL 0.40 mm; antennomeres I and II each about 1.7 × as long as broad, III–VIII each about as long as broad, IX–X each slightly transverse, XI much shorter than IX and X combined, about 1.5 × as long as broad, with rounded apex.

Pronotum broadest near anterior third; PL 0.25 mm, PW 0.23 mm. Anterior margin and lateral margins in anterior fourth strongly rounded; sides slightly narrowing posterad and weakly sinuate; posterior margin arcuate with indistinct flattening in front of scutellum; antebasal transverse groove distinct and arcuate, with indistinct median pit, distinctly deepened at each end. Punctures on pronotal disc inconspicuous, fine and sparse; setae moderately dense, short and nearly recumbent, lateral bristles sparse but well visible.

Elytra together oval, distinctly flattened, broadest between middle and anterior third; EL 0.50 mm, EW 0.40 mm, EI 1.25; subhumeral lines diffuse and about as long as 0.4 EL; elytral apices separately rounded, each with large, round dimple with diffuse margins, nearly adjacent to elytral suture and narrowly separated from posterior elytral margin. Punctures on elytra only slightly more distinct than those on pronotum but still inconspicuous; setae short, sparse and suberect. Hind wings well developed.

Legs long and slender, unmodified.

Aedeagus ( Figs 13–16 ) slender and lightly sclerotized; AeL 0.25 mm; in ventral view apical region of median lobe strongly asymmetrical, with deep oblique emargination; apical projections simple, the longest forming relatively broad and weakly curved hook visible in lateral view; parameres in lateral view slender, indistinctly broadened in subapical region, each with three thin subapical setae (median seta broken off in Figs 15–16 ).

Female. Unknown.

Distribution. Northern French Guiana ( Fig. 25 ).

Etymology. After the capital city of French Guiana, Cayenne.

Remarks. This species is most similar to the sympatric A. opticus ; see Remarks under the latter species.

Figures

FIGURE 25. Distribution of nominal Alloraphes species.

FIGURES 1–8. Dorsal habitus (1, 3, 5, 7) and head in dorsal view (2, 4, 6, 8). Alloraphes opticus sp. n. (1–2), A. cayennensis sp. n. (3–4), A. iyonolanus sp. n. (5–6), and A. ecuadoranus sp. n. (7–8).

FIGURES 9–16. Aedeagus in ventral (9, 11, 13, 15) and lateral (10, 12, 14, 16) views. Alloraphes opticus sp. n. (9–12), and A. cayennensis sp. n. (13–16).