Xotidium reductum, Löbl, 2023

Löbl, Ivan, 2023, On the Scaphidiinae (Coleoptera: Staphylinidae) of Java, Indonesia, Acta Musei Moraviae, Scientiae biologicae 108 (1 - 2), pp. 1-34 : 30

Xotidium reductum sp. nov.

( Figs 37 39 )

Type material. Holotype male, Java Mt. Gede , 1400 m, 25.V.1966, Rougemont ( MHNG).

Description. Length 1.38 mm, width 0.83 mm, dorsoventral diameter 0.78 mm. Head and body dark brown, apical abdominal segments and appendages light brown to yellowish. Antennae long, length/width ratios of antennomeres III 25 /6: IV 30 /5: V 32 /6: VI 38 /7: VII 36 /10: VIII 45 /7: IX 47 /9: X 43 /12: XI 44 /16. Dorsal surface of body very finely punctate. Scutellum completely concealed. Elytron with sutural stria rather deeply impressed, curved along pronotal lobe and extending along base to humeral area, not joining lateral stria; adsutural area flat. Metaventrite convex in middle; submesocoxal areas 0.03 mm long, about as long as half of shortest interval to metacoxa; punctation on ventral side of thorax very fine, few distinct punctures margining outer section of submetacoxal lines excepted. Mesepimeron and metanepisternum completely concealed. Abdomen lacking microsculpture and very finely punctate.

Male. Protarsomeres I to III hardly widened. Aedeagus ( Figs 37 39 ) 0.62 mm long.

Etymology. The species epithet is a Latin adjective meaning reduced.

Differential diagnosis. The new species shares with X. heissi Ogawa & Löbl, 2016 , S. montanum ( Löbl, 1971) and X. uniforme Löbl, 1992 a flagellum longer than half of the length of the median lobe. It is distinguished by the expanded apical section of the parameres which is about as long as half of the total parameral length and abruptly narrowed at apices. It differs also from X. montanum and X. uniforme by the internal sac bearing extremely fine scale­like structures, and by lacking spinose structures along the ejaculatory duct.

Figures

Figs 37-39. Male genitalia. 37 – Xotidium reductum sp. nov.; aedeagus in dorsal view, scale = 0.1 mm. 38 – Ditto, internal sac, part extending beyond tip of parameres, in dorsal view, scale = 0.1 mm. 39 – Ditto, paramere in ventral view, scale = 0.05 mm.