Pselaphodes dalatensis, Yin & Li, 2021

Yin, Zi-Wei & Li, Ning, 2021, Eight new species and additional records of the Pselaphodes complex from Laos and Vietnam, with a key to known species (Coleoptera: Staphylinidae: Pselaphinae), Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) 61 (1), pp. 35-53 : 42

Pselaphodes dalatensis sp. nov.

( Figs 4B , 6 )

Type material (1 specimen). HOLOTYPE: VIETNAM: LÂM Đồ NG: ♂, ‘VIETNAM.Da Lat, Institute of Biology , at light, No. 765., 10.XII.1994, S. Mahunka, Gy. Sziráki & L. Zombori’ ( MHNG) .

Diagnosis. Male body length 3.85 mm.Antennomeres 9–11 greatly modified and forming distinct club, antennomere 9 broadly impressed on ventral surface, with short basal protuberance and setose tuft above protuberance, apical margin strongly elevated and expanded to form irregular lamina-like projection, antennomere 10 with mesal margin bluntly projected at base, antennomere 11 strongly constricted at base. Protrochanter with sharp ventral spine at base and tiny ventral tooth near apex, profemur with large triangular ventral projection at middle, protibia with two roundly-triangular projections along mesal margin in apical half; mesotrochanter with acute ventral spine. Hornlike metaventral processes short, in lateral view triangular, narrowing apically. Aedeagus with moderately long parameres; endophallus composed of two elongate sclerites. Female unknown.

Description. Male ( Fig. 4B ). Body length 3.85 mm. Head approximately as long as wide, HL 0.68 mm, HW 0.70 mm; eyes prominent, each composed of about 45 facets. Antennomeres 2–7 each moniliform, except for antennomere 3 distinctly longer than 2 and 4; antennomeres 9–11 ( Fig. 6A ) greatly modified, antennomere 9 broadly excavated on ventral surface, with short basal protuberance, apical part strongly elevated and expanded to form irregular lamina-like projection, with setose tuft below projection, antennomere 10 moderately curved in lateral view, its mesal margin bluntly projected at base, antennomere 11 strongly constricted at base. Pronotum ( Fig. 6B ) slightly longer than wide, PL 0.70 mm, PW 0.67 mm, narrowing apically at apical 2/5. Elytra much broader than long, EL 1.09 mm, EW 1.35 mm. Hornlike metaventral processes ( Fig. 6C ) short, in lateral view sub-triangular and narrowing apically. Protrochanter ( Fig. 6D ) with sharp ventral spine at base, and tiny ventral tooth near apex; profemur with large triangular ventral projection at middle; protibia ( Fig. 6E ) with two roundly-triangular projections along mesal margin in apical half; mesotrochanter ( Fig. 6F ) with acute ventral spine; mesofemur ( Fig. 6F ), metatrochanter and metafemur ( Fig. 6G ) simple. Abdomen broad at base and narrowed posteriorly, AL 1.28 mm, AW 1.28 mm. Aedeagus ( Fig. 6H–J ) with elongate parameres, each ( Fig. 6E ) having four thick apical setae; endophallus composed of two elongate sclerites (note: the median lobe of the aedeagus is broken in holotype).

Female. Unknown.

Comparative notes. This is another distinctive species, the male of which can be rather easily distinguished from all congeners by unusual forms of the antennal club and protibia.

Etymology. The new species name, dalatensis (- is, - e), is a latinized adjective given after the type locality, Da Lat city.

Distribution. Vietnam: Lâm Đồng.

Figures

Fig. 4. Dorsal habitus of Pselaphodes males. A – P. banphabat sp. nov.; B – P. dalatensis sp. nov. Scale bars: 1 mm.

Fig. 6. Male diagnostic features of Pselaphodes dalatensis sp. nov. A – eight antennal club, in ventral view; B – pronotum; C – metaventral process, in lateral view; D – protrochanter and profemur; E – protibia; F – mesotrochanter and mesofemur; G – metatrochanter and metafemur; H–J – aedeagus, in dorsal (H), lateral (I), and ventral (J) view; K – apex of right paramere. Scale bars: 0.3 mm in A, B, D, E, F, G; 0.2 mm in C, H, I, J; 0.1 mm in K.