Naddia asetosa, De, 2014

De, G., 2014, The genus Naddia in Borneo (Coleoptera: Staphylinidae: Staphylininae), Linzer biologische Beiträge 46 (2), pp. 1737-1765 : 1742-1743

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