Hyperstoma Wittmer, 1979

Janisova, Kristyna & Bocakova, Milada, 2011, Review of the genus Hyperstoma (Coleoptera: Lampyridae), Zootaxa 2975, pp. 64-68 : 65

Hyperstoma Wittmer, 1979

Hyperstoma Wittmer, 1979: 84 .

Type species. Hyperstoma marginata Wittmer, 1979 (by monotypy).

Diagnosis. Hyperstoma can be distinguished from other Ototretinae by combination of following characters: t erminal maxillary and labial palpomere extremely long, male antennae flabellate with stout branches attached to antennomere apex, male terminal and penultimate abdominal terga fused, jointly trilobed.

Description. Body length 5–5.5 mm, humeral width 2.05–2.35 mm, body oval, mainly yellow to light brown, distal portion of antennae and elytral margins dark brown. Head from above partly hidden by pronotum. Eyes small, distance between eyes 1.8–2× longer than eye diameter. Antennae 11-segmented, antennomeres 3–10 flabellate ( Figs 3, 4 ), lamellae strongly flattened, attached to antennomere terminal portion, branches of median antennomeres about 2.7–3× longer than antennomere body, branches of terminal antennomeres moderately shorter. Mandibles small, hooked, apically pointed. Maxillary palpi 4-segmented, labial palpi 3-segmented, terminal palpomeres of both palpi enlarged, flattened, oval, 2.2–3.3× longer than width. Pronotum ( Figs 1, 2 ) yellow to light brown, 1.8× as wide as long, anterior margin almost straight, anterior angles rounded, posterior angles triangular, projected obliquely backwards, provided with weak circular pit distally, median portion of pronotum with longitudinal groove. Scutellum triangular, yellow to light brown. Elytra elongate, each elytron about 2.7–3.4× longer than wide, widest medially, apex rounded. Elytra shiny, irregularly densely punctured, slightly pubescent, each elytron with 2 inconspicuous costae. Terminal abdominal sternum with oval basal portion and straight margins distally. Terminal and penultimate abdominal terga fused, jointly trilobed ( Figs 9, 10 ) with straight or U-shaped basal portion. Penultimate tergum extending in 2 lateral protrusions, forming 2 longitudinal apertures along terminal tergum. Male genitalia with V-shaped phallobase ( Figs 5–8 ), paramerae robust, apex rounded or with oblique edge distally, paramerae about 1/5 longer than phallus. Phallus cochleariform, provided with short ventroapical projection and forked, angular projection basally ( Figs 6, 8 ). Female unknown.

Distribution. Sri Lanka.

Comment. Hyperstoma is closely related to the genera Lamellipalpus Maulik, 1921 and Lamellipalpodes Maulik, 1921 . All the genera share a unique synapomorphic character: fused terminal and penultimate terga.

Figures

FIGURES 1 – 4. 1 – 2 Head and pronotum, 3 – 4 Basal antennomeres. 1, 3 Hyperstoma marginata; 2, 4 H. wittmeri sp. nov. Scale— 0.5 mm.

FIGURES 5 – 10. 5 – 8 Male genitalia in ventral and lateral view, 9 – 10 terminal and penultimate abdominal terga. 5, 6, 9 Hyperstoma marginata; 7, 8, 10 H. wittmeri sp. nov. Scale— 0.5 mm.