Naddia asetosa De 2014, nov.sp.

Naddia asetosa nov.sp.

(Fig. 1)

Holotype: INDONESIA, Borneo, Kalimantan Tengah, Busang / Rekut confl. 0˚03’S 113˚59’E, Flight Intercept FIT 6, Brendell / Mendel, August 2001, ‘ Barito Ulu 2001’, BMNH(E) 2001-191 (in NHML).

This species has the deep occipital emargination and salient postero-lateral lobes of the head characteristic of Naddia, but differs notably in the following respects:

 the sides of the head, instead of being parallel or expanded posteriad as in Naddia, are retracted between the posterior margins of eyes and the posterolateral angles, giving the insect a vague resemblance to some members of the Eucibdelus lineage;

 the antennae are long, with all segments symmetrical, and except for the second, at least as long as broad, the terminal antennomeres not transverse, asymmetrical, flattened or sub-serrate as in most other Naddia;

 the puncturation of head and pronotum is finer than in other Naddia species;

 the sides of head, elytra and pleurites ot the genital segment are totally devoid of long setae, which are always present in other Naddia, (among the fine puncturation there are no larger punctures present from which setae might have broken off).

These differences suggest that a new genus should be described to accommodate this species; however given the present uncertain knowledge of phylogenetic lineages in the Staphylinini, and the absence of males, it seems more prudent to describe it, at least provisionally, as belonging to Naddia. As the specimen is glued to the card with a cement that does not seem to be soluble in water or ethyl-acetate, I am unable to examine the ventral structures for fear of damaging this unique specimen.

Description: Proportions of holotype: length: 13 mm; length of head: 1.7; total length of head: 2.0; maximum breadth of head: 2.0; breadth of head in front of posterolateral angles: 1.8; length of eye: 0.8; length of temples: 1.00; length of antenna: 3.5; length of pronotum: 2.2; breadth of pronotum: 2.2; length of elytron: 2.9; breadth of elytra: 2.8. Habitus: fig. 1.

Temples retracted towards postero-lateral angles. Labrum divided into two separate lobes, each lobe bearing six terminal black setae; both mandibles with a broad and long single molar, the right one slightly but distinctly bicuspid; palpi as in most Naddia spp., the terminal segments shorter than in Platydracus and more inflated. Antennae almost filiform, all antennomeres elongate, antennomeres 7-10 less so, almost quadrate, all antennomeres symmetrical. Protarsi dilated, though much less so than in other species.

Integument of entire body black except posterior 2/3rd of elytra brassy metallic. Legs black. Head with a few short brassy setae, more conspicuous on temples; sides of pronotum with some sparse pale brassy pubescence; pubescence of scutellum black; elytra entirely covered with moderately dense long golden pubescence, except narrowly along anterior margin; abdominal tergites V-VII with a pair of narrow antero-lateral fasciae of short silvery pubescence; on tergite VII the two fasciae meeting in the centre to form a single transverse band.

Puncturation of head close, sub-rugose, composed of umbilicate punctures on posterior 1/3rd, the interstices coalescing to form long longitudinal rugae in anterior 2/3rd; puncturation of pronotum similar to that of posterior 1/3rd of head; the mid-longitudinal band interrupted near anterior and posterior margins and in the middle, leaving only two narrow elongate shiny calluses; puncturation of elytra very fine and dense.

Male: unknown