Obesoconnus guyanensis, Jałoszyński, Paweł, 2014

Jałoszyński, Paweł, 2014, Obesoconnus gen. n., a new bizarre Neotropical genus of Cyrtoscydmini (Coleoptera: Staphylinidae: Scydmaeninae), Zootaxa 3794 (3), pp. 481-491 : 485-487

Obesoconnus guyanensis sp. n.

( Figs. 1 , 3–13 , 16–17 , 20 )

Type material. Holotype: French Guyana: ♂, two labels: “Guyane française / Cabarson / Ile de Cayenne / N. Degallier XI-78 ” [white, printed and handwritten in black ink]; “ OBESOCONNUS / guyanensis m. / det. P. Jałoszyński ’14 / HOLOTYPUS” [red, printed] ( MHNG). Paratype: ♂ (disarticulated), same data as holotype, except for yellow “ paratypus ” label (cPJ).

Diagnosis. Male: frons between eyes nearly as broad as 1/3 HW; pronotal median antebasal pit small but distinct; elytral apices unmodified; aedeagus in ventral view strongly narrowing from middle to apex, with apices of parameres not reaching apical margin of median lobe ( Figs. 16–17 ). Diagnostic characters of females unknown.

Description. Body of male ( Fig. 1 ) strongly convex, dark brown, covered with silverish vestiture; BL 1.01 mm.

Head ( Figs. 1 , 3–4 ) broadest at strikingly large, strongly convex but moderately coarsely faceted eyes, HL 0.18 mm, HW 0.25 mm; vertex and frons confluent, anterior part of vertex and posterior part of frons with sharply marked short median longitudinal groove; frons between eyes nearly as broad as 1/3 HW; supraantennal tubercles indistinct. Punctation on frons and vertex inconspicuous, fine; setae short, sparse and suberect. Antennae slender but short, AnL 0.35 mm, as in Fig. 4 .

Pronotum ( Fig. 1 ) semi-oval, broadest near anterior third but barely noticeably narrowing posteriorly; PL 0.26 mm, PW 0.35 mm. Anterior margin strongly and broadly rounded; lateral margins slightly rounded; posterior corners indistinct, strongly obtuse and blunt; posterior margin distinctly arcuate. Pronotum near base with shallow and narrow but distinct transverse groove connecting pair of small and shallow lateral pits, and with small median pit; additionally area between lateral pit and lateral pronotal margin bearing shallow and large subtriangular impression. Punctation on pronotal disc small and shallow but relatively distinct and dense, separated by spaces comparable to puncture diameters; setae sparse, short and suberect.

Elytra ( Fig. 1 ) oval, broadest between middle and anterior third; EL 0.58 mm, EW 0.50 mm, EI 1.15 mm; humeri developed as prominent longitudinal protuberances; elytral apices unmodified, separately rounded. Punctation on elytra dense but superficial, less distinct than those on pronotum; setae short, sparse and suberect. Hind wings well developed.

Legs moderately long and slender, without modifications.

Aedeagus ( Figs. 12–13 , 16–17 ) in ventral view strongly narrowing toward base and apex; AeL 0.23 mm; apical projection tapering; orifice at base of parameres located subbasally; apices of parameres not reaching apical margin of median lobe; each paramere with one long apical seta.

Female. Unknown.

Distribution. Northern part of French Guyana ( Fig. 20 a).

Etymology. Locotypical; after the country name Guyana.

Figures

FIGURE 20. Distribution of Obesoconnus gen. n. Obesoconnus guyanensis sp. n. (a) and O. mexicanus sp. n. (b).

FIGURES 1 – 2. Dorsal habitus of holotype males. Obesoconnus guyanensis sp. n. (1) and O. mexicanus sp. n. (2).

FIGURES 3 – 8. Morphology of Obesoconnus guyanensis sp. n. Head in dorsal (3) and ventral (4) views; labrum in dorsal view (5); left mandible in dorsal view (6); left maxilla in ventral view (7); and labium in ventral view (8). Abbreviations: bst, basistipes; cd, cardo; cl, clypeus; fo, foramen occipitale; fr, frons; gal, galea; gp, gular plate; gs, gular suture; hr, hypostomal ridge; lac, lacinia; lhph, lateral lobe of hypopharynx; lp 1 – 3, labial palpomere I – III; lss, lateral suture of submentum; mn, mentum; mst, mediostipes; mxp 1 – 4, maxillary palpomere I – IV; oc, occiput; pmn, prementum; ppf, palpifer; smn, submentum; vt, vertex.

FIGURES 9 – 11. Morphology of Obesoconnus guyanensis sp. n. Prothorax in ventral view (9); pterothorax in dorsal (10) and ventral (11) views. Abbreviations: aest 2, mesanepisternum; ai, asetose impression of mesoventrite; alc, alacrista; ap, apodeme; ar, anterior ridge of mesoventrite; bs, basisternal part of prosternum; hy, hypomeron; hyr, hypomeral ridge; lmfa, lateral metafurcal arm; mcp, mesocoxal projection; mma, median membranous area; mscc, mesocoxal cavity; mscs, mesocoxal socket; msff, mesofurcal fovea; msvp, mesoventral intercoxal process; mtvp, metaventral intercoxal process; nss, pronotosternal suture; pcc, procoxal cavity; pcs, procoxal socket; pf, profurca; pff, profurcal fovea; pre, prepectus; prsc 3, metaprescutum; psn 3, metapostnotum; psp, prosternal intercoxal process; sc 2, mesocutum; sc 3, metascutum; scl 2, mesoscutellum; sss, mesoscutoscutellar suture; v 3, metaventrite.

FIGURES 12 – 15. Aedeagus in ventral (12, 14) and lateral (13, 15) views. Obesoconnus guyanensis sp. n. (12 – 13) and O. mexicanus sp. n. (14 – 15). Abbreviations: ap, apical projection; bpa, basal pumping apparatus.

FIGURES 16 – 19. Aedeagus in ventral (16, 18) and lateral (17, 19) views. Obesoconnus guyanensis sp. n. (16 – 17) and O. mexicanus sp. n. (18 – 19). Abbreviations: ap, apical projection; bpa, basal pumping apparatus.