Cephennomicrus typicus (Scott)

Jałoszyński, Paweł, 2019, Review of Cephennomicrus and Pomphopsilla of the Seychelles (Coleoptera, Staphylinidae, Scydmaeninae), Zootaxa 4568 (2), pp. 357-371 : 366-367

Cephennomicrus typicus (Scott)

( Figs 6 , 12–13 , 24–25, 36–37, 43)

Neseuthia typica Scott, 1922: 203 , pl. 19, fig. 3, 3a.

Cephennomicrus typicus (Scott) ; Jałoszyński, 2008: 34.

Type material. Lectotype (designated by Jałoszyński (2008); labels in Fig. 43 ): ♂, mounted on thick cardboard bearing male symbol and number 117 handwritten in black ink, with nine labels: "Percy Sladen / Trust Exped. / Brit.Mus. / 1926-246" [white, printed], "Mahe, '08-9 / Seychelles Exp." [white, printed], " Neseuthia typica / TYPE. H.Scott / TYPE " [white, handwritten, with " TYPE " printed on a blue card and glued onto the white label], " typicus Scott / Cl. Besuchet / dét. X 1957 " [white, printed and handwritten], "Figured specimen" [red, printed], " Lectotype " [white circle with violet margin, printed], "Type" [white circle with red margin, printed], " NESEUTHIA / typica / Scott / LECTOTYPE ' P. JAŁOSZYŃSKI, 2007" [white, printed], and " CEPHENNOMICRUS / typicus / (Scott) / det. P. JAŁOSZYŃSKI, 2007" [white, printed] ( NHM) . Paralectotypes: 4 ♂♂, two mounted on one thick cardboard bearing number 120, two mounted separately on modern cardboards (clearly remounted from their original boards), same data as for lectotype, except for white " PARALECTOTYPUS " labels and white circles with yellow margins with printed " Paratype " ( NHM) .

Additional material studied. 1 ♂, " SEYCHELLEN: 27,5.1996 / Mahé, Westküste / Morne Blanc, 400-667 m / leg. Schödl" (NHMW).

Revised diagnosis. BL ~ 0.90 mm; frontal impression in male U-shaped with broadly rounded posterior margin, areas flanking impression weakly elevated, vertex with a pair of large impressions; aedeagus with slender ventral apical plate and pointed apex, flagellum in ventral view with small proximal and large distal loops.

Redescription. Body of male ( Fig. 6 ) moderately stout, strongly convex, umber brown; setae on head, pronotum and elytra very short but well-visible. BL 0.8 9– 0.95 mm (mean 0.92 mm).

Head ( Figs 12–13 ) broadest at large, strongly convex and coarsely faceted eyes, HL 0.11–0.13 mm (mean 0.12 mm), HW 0.25 mm; frons with distinct U-shaped impression with broadly and evenly rounded posterior margin, impression posteriorly and posterolaterally delimited by an M-shaped area which is only weakly elevated and bears a pair of tiny porous fields near middle, vertex confluent with frons, with a pair of large but shallow and diffuse impressions; supraantennal tubercles weakly elevated. Punctures on frontal impression distinct, on sides of frons and vertex and on posterior portion of vertex indistinct, moderately dense, very small; setae on frontal impression moderately dense, short and recumbent to slightly suberect, setae on sides of frons and vertex and along posterior margin of vertex sparse, short and recumbent, impressions on vertex and M-shaped frontal elevation asetose. Antennae slender, with indistinctly delimited trimerous club, AnL 0.43–0.45 mm (mean 0.43 mm), antennomeres I–II strongly elongate, III–IX each slightly to distinctly elongate, X about as long as broad, XI about as long as IX– X combined, about twice as long as broad.

Pronotum subtrapezoidal, broadest near anterior fourth; PL 0.28–0.30 mm (mean 0.28 mm), PW 0.35–0.38 mm (mean 0.36 mm); anterior and posterior margins weakly convex, sides rounded in anterior third, barely noticeably sinuate in posterior third; anterior corners broadly rounded, posterior corners strongly obtuse-angled and blunt; base with two lateral pairs of small but distinct pits, inner pair connected by a shallow transverse groove, additionally with a very small, barely noticeable median pit; lateral pronotal carinae not serrate. Punctures on pronotal disc dense but superficial and diffuse; setae short, moderately dense, recumbent.

Elytra oval, broadest near anterior third; EL 0.50–0.53 mm (mean 0.52 mm), EW 0.45–0.48 mm (mean 0.46 mm), EI 1.11–1.17; humeral calli distinct; apices separately rounded, subtriangular adscutellar area strongly and abruptly elevated. Punctures on elytra similar to those on pronotum but deeper and elytral surface appears finely shagreened; setae short, moderately dense, recumbent.

Legs moderately long and slender, unmodified.

Aedeagus (Figs 24–25) stout; AeL 0.15 mm; median lobe in ventral view with triangular, strongly elongate apical plate; flagellum (Figs 36–37) in ventral view with small proximal and large submedian loop; apical parameral seta slightly thicker than subapical seta.

Female. Not studied.

Distribution. Seychelles, Mahé Island.

FIGURES 26–37. Endophallic flagellum in ventral (26, 28, 30, 32, 34, 36) and lateral (27, 29, 31, 33, 35, 37) views, and aedeagus in ventral (38) and lateral (39) views. Cephennomicrus cordithorax (26‾27), C. cornutus (28‾29), C. minor (30‾31), C. perexiguus (32‾33), C. politus (34‾35), C. typicus (36–37), and Pomphopsilla crenata (38‾39).

Remarks. Scott (1922) mentioned 18 males and 11 female specimens; only four males were available to my study. Adults of this species are largest among Cephennomicrus of the Seychelles; they are very similar to those of C. cornutus , see remarks at the latter species.

Figures

FIGURES 1–7. Habitus of Cephennomicrus cordithorax (1), C. cornutus (2), C. minor (3), C. perexiguus (4), C. politus (5), C. typicus (6), and Pomphopsilla crenata (7).

FIGURES 8–13. Head of males in dorsal (8‾12) and anterodorsal (13) views. Cephennomicrus cordithorax (8), C. cornutus (9), C. minor (10), C. politus (11), and C. typicus (12‾13).

FIGURES 38–44. Historical (Scott's and Besuchet's) set of labels of holotypes (38, 39, 42) and lectotypes (40, 41, 43, 44). Neseuthia cordithorax (38), N. cornuta (39), N. minor (40), N. perexigua (41), N. polita (42), N. typica (43), and N. crenata (44).