Xotidium tubuliferum, Lobl, 2011

Löbl, Ivan, 2011, On the Scaphisomatini (Coleoptera: Staphylinidae: Scaphidiinae) of the Philippines, II, Revue suisse de Zoologie 118 (4), pp. 695-721 : 720

Xotidium tubuliferum sp. n. Figs 52-55

HOLOTYPE: Ƌ, Tarragona, Leyte I. Philippine Islds VIII: II: 1945 / Col. & pres. by C. L. Remington /in rotting burned log ( FMNH).

ADDITIONAL MATERIAL: 1 Ƌ (lacking head and prothorax), with the same data as the holotype ( MHNG) .

DESCRIPTION: Length 1.60 mm, width 0.98 mm, dorsoventral diameter 0.93 mm. Body and head uniformly reddish-brown to piceous, femora, tibiae and basal abdominal segments hardly lighter, apical abdominal segments, antennae and tibiae distinctly lighter, almost yellowish. Length ratio of antennomeres as: III 10: IV 14: V 16: VI 15: VII 18: VIII 18: IX 15: X 18: XI 22. Segments III to VIII very narrow, segments VII and VIII similar, only slightly wider than segment III to VI, segments IX to XI much wider. Pronotal and elytral punctation very fine, visible at 50x magnification. Lateral parts of metaventrite and abdomen impunctate. Elytra each with fine basal stria joined to sutural and lateral striae; adsutural areas flat. Center of metaventrite almost flat, with few distinct punctures. Mesocoxal areas 0.07 mm long, shortest interval to metacoxae about 0.10 mm. Metepisterna flat, parallel-sided, about 0.08 mm wide. Abdomen impunctate, with punctulate microsculpture, metacoxal lines impunctate.

Male. Segments 1-3 of protarsi slightly widened. Aedeagus (Figs 52-55) 0.72 mm long.

HABITAT: Rotting burned log.

DISTRIBUTION: Philippines: Leyte.

COMMENTS: This new species resembles X. uniforme Löbl, 1992 by its comparatively large size and by the color of the body, in combination with the elytra having complete and joined basal and sutural striae. Xotidium mauritianum ( Vinson, 1943) is almost as large and has also unicolored body, but differs drastically from its congeners by the shortened sutural striae and the absence of basal striae (see VINSON, 1943). Xotidium tubuliferum may be distinguished easily by its aedeagus lacking sclerotized flagellum, and by the long widened apical section of the parameres.

Both available males have completely extruded internal sac of the aedeagus. It consists of a simple tube narrowed in middle, longer than the entire median lobe. Very fine, spine-like structures are present in its basal part.