Agathidium (Macroceble) unicorne, Švec, 2012

Švec, Zdeněk, 2012, New Leiodinae (Coleoptera: Leiodidae) from India and Papua New Guinea, Acta Entomologica Musei Nationalis Pragae 52 (2), pp. 411-424 : 417-418

publication ID	https://doi.org/ 10.5281/zenodo.5331202
persistent identifier	https://treatment.plazi.org/id/297B87BC-A27B-FFCE-FE37-67C6FEE2ABDB
treatment provided by	Diego
scientific name	Agathidium (Macroceble) unicorne
status	sp. nov.

Treatment

Agathidium (Macroceble) unicorne View in CoL sp. nov.

( Figs. 9, 10 View Figs , 24, 25 View Figs 18–29 )

Type locality. India, Arunachal Pradesh, 11 km SSE of Tenga, Eagles Nest wildlife sanctuary, 27º06′23″N 92º26′02″E, 2510 m a.s.l.

Type material. HOLOTYPE: J ( NMPC): ‘ INDIA: Arunachal Pradesh (15) / 11 km SSE of Tenga, Eagles / Nest WL sanctuary, 4.v.2008 / 27º06′23″N 92º26′02″E, 2510 m / Fikáček, Podskalská, Šípek lgt. // primary evergreen mountain / cloud forest with very sparse / understory vegetation, sifting: / wet leaf litter’ GoogleMaps . PARATYPES: 1 J ( ZSPC): same data as the holotype.

Description. Body length 1.7–1.9 mm (holotype 1.9 mm). Length of body parts (holotype): head 0.4 mm, pronotum 0.8 mm, elytra 0.7 mm, antenna 0.7 mm. Maximum width of body parts (holotype): head 0.7 mm, pronotum 1.2 mm, elytra 1.1 mm.

Body shortly oval ( Fig. 24 View Figs 18–29 ), chestnut in color, antennae and legs reddish-brown. Venter light yellow. Dorsum without microreticulation; feebly punctate, each puncture with very short and fine seta.

Head. Maximum width of head approximately in the midlength of eyes. Eyes flat, narrow, 10× as long as wide in dorsal view. Clypeus not emarginate with slightly convex anterior margin; clypeal line missing. Small bump present above antennal articulation. Dorsal surface with very sparsely scattered fine punctures separated at least by ca. 10× their diameter. Mandibles without striking characters. Relative length of antennal segments III: II = 1.2.

Pronotum. Widest just before base. Lateral sides slightly roundly tapered anteriorly in dorsal view; shortly rounded in lateral view ( Fig. 25 View Figs 18–29 ). Puncturation sparser and finer than that of head.

Elytra. Broadest just before midlength. Punctures as on pronotum. Sutural stria absent.

Legs. Protarsomeres I–III and mesotarsomere I enlarged in male. Femora simple. Tarsal formula 5-5- 4 in male. Female uknown.

Mesoventrite. Longitudinal mesoventral carina present; lateral lines not developed. Metathoracic wings absent.

Metaventrite. Femoral lines absent. Male with high horn-shaped ventro-caudally oriented process at posterior margin between coxae.

Genitalia. Aedeagus as in Figs 9–10 View Figs ; operculum oblong rectangular with very feeble emargination on anterior margin. Female not known.

Variability. The length ratio of antennal segments III: II varies between 1.2–1.3 in the type specimens; the ratio of the length: width of the eyes in dorsal view being between 8–10.

Differential diagnosis. Agathidium (Macroceble) unicorne sp. nov. is similar to A. (Macr.) scutellare Angelini & DeMarzo, 1989 in the small body size, the non-emarginate clypeus, simply-shaped posterior femora in male, and by the length ratio of antennomeres III: II. It differs from the latter species by the shape of the aedeagus, especially by the thickened parameres (in contrast to slender parameres in A. scutellare ).

Etymology. The name of the new species refers to the hook-like process on the metaventrite.

Bionomics. Type specimens were found by the sifting of thick layers of wet leaf litter in the primary evergreen mountain cloud forest with very sparse understory vegetation (M. Fikáček, pers. comm.).