Elacatophora jambiana, Jałoszyński, 2020

Jałoszyński, Paweł, 2020, Four new species of the Oriental genus Elacatophora L. W. Schaufuss (Coleoptera Staphylinidae, Scydmaeninae), Zootaxa 4834 (2), pp. 264-272 : 267-268

Elacatophora jambiana sp. n.

( Figs 2 , 9–12 )

Type material. Holotype: INDONESIA (Jambi Province): ♂, two labels: “ SUMATRA: Jambi / Mt. Kerinci , 3300 m / 12.XI.1989 / Agosti, Löbl / Burckhardt # 12a” [white, printed]; “ Elacatophora / jambiana m. / P. Jałoszyński, 2020 / HOLOTYPUS ” [red, printed] ( MHNG) . Paratype: 1 ♀, same data as holotype ( MHNG) .

Diagnosis. BL> 1.2 mm but <1.5 mm; pronotal antebasal transverse groove entire; antennal club composed of antennomeres 6–11 and weakly thickening distad; aedeagus in ventral view conspicuously stout, in lateral view with apical projections strongly curved dorsad, endophallic sclerites very short, confined to less than basal fifth of capsular portion of median lobe, parameres in lateral view distinctly broadened at middle.

Description. Body ( Fig. 2 ) moderately slender with flattened pronotum and elytra, light brown, covered with yellowish setae; BL 1.38 mm.

Head broadest at moderately large, weakly convex and coarsely faceted eyes, HL 0.25 mm, HW 0.23 mm; vertex and frons convex, together elongate but not rectangular; supraantennal tubercles barely marked. Punctures on frons and vertex inconspicuous; setae sparse, long and suberect, with sparse thick bristles directed posterad and dorsoposterad. Antennae moderately long and slender, with distinctly delimited club composed of antennomeres 6–11, AnL 0.63 mm, antennomeres 1–2 each distinctly elongate, 3 transverse, 4–7 each about as long as broad, 8–10 each transverse, 11 indistinctly broader than 10, clearly shorter than 9–10 combined, indistinctly elongate, oval and almost symmetrical.

Pronotum subconical, broadest at base; PL 0.33 mm, PW 0.30 mm; anterior and lateral margins nearly straight; posterior margin shallowly bisinuate; pronotal base with distinct and entire transverse groove connecting small and diffuse lateral pits, and with separated from groove lateral pair of small and indistinct impressions. Punctures on pronotal disc fine and inconspicuous; disc with long and sparse suberect setae, sides with sparse, long thick bristles.

Elytra oval, broadest distinctly in front of middle; EL 0.80 mm, EW 0.60 mm, EI 1.33; humeral calli weakly developed, basal impressions moderately large and deep, distinctly elongate; apices separately rounded. Punctures on elytra as inconspicuous as those on pronotum; setae long, sparse, suberect. Hind wings well developed.

Legs moderately long and slender, pro- and metatibiae straight, mesotibiae indistinctly curved.

Aedeagus ( Figs 9–12 ) in ventral view stout, barrel-shaped; AeL 0.13 mm; apical portion so strongly bent dorsad that not visible in ventral view, in lateral view median lobe crescent-shaped; endophallus in ventral view with two small lateral basal bunches of short needle-like sclerites; parameres short, in lateral view distinctly broadened, each with two apical setae.

Female. Externally similar to male, but with slightly smaller eyes; BL 1.39 mm; HL 0.25 mm, HW 0.23 mm, AnL 0.60 mm; PL 0.34 mm, PW 0.34 mm; EL 0.80 mm, EW 0.63 mm, EI 1.28.

Distribution. Central Sumatra ( Fig. 21 ).

Etymology. Named after the province of Jambi, Indonesia.

Remarks. Elacatophora jambiana and E. kerinciana described below are the first species of this genus known to occur on Sumatra. Elacatophora jambiana belongs to a group of species with conspicuously small adults and it can be easily distinguished from all remaining species by its unique, extremely stout and in lateral view extremely curved, crescent-shaped aedeagus. Besides genital characters, males of this species differ from those of the sympatric E. kerinciana ( Fig. 2 vs. 3) in the antennal club composed of antennomeres 6–11 (club composed of antennomeres 7–11 in E. kerinciana ); shorter and sparser setae on pronotum and elytra; and nearly straight mesotibiae (strongly curved in E. kerinciana ).

Figures

FIGURE 21. Distribution of nominal Elacatophora species. Collecting locality for Elacatophora soesilae is known only as “central Java”.

FIGURES 1–4. Dorsal habitus of a paratype female (1) and holotype males (2–4). Elacatophora thailandiana sp. n. (1); E. jambiana sp. n. (2); E. kerinciana sp. n. (3); E. indica sp. n. (4).

FIGURES 5–12. Aedeagus in ventral (5, 7, 9, 11) and lateral (6, 8, 10, 12) views. Elacatophora thailandiana sp. n. (5–8); E. jambiana sp. n. (9–12).