Thaumastopeus striatus siberutanus, Jákl, 2011

Jákl, Stanislav, 2011, Description of seven new taxa of Cetoniinae from Indonesia (Coleoptera: Scarabaeidae), Acta Entomologica Musei Nationalis Pragae 51 (2), pp. 535-550 : 547-548

Thaumastopeus striatus siberutanus subsp. nov.

( Figs. 6a–c )

Type locality. Indonesia, West Sumatra province, Mentawai Archipelago, northern part of Siberut Island, Bojakan village, 50–200 m a.s.l.

Type material. HOLOTYPE:J ( NMPC): ‘ Indonesia, Mentawai isls., SIBERUT ISL., north, 50 – 200 m, BOJAKAN VILL. ENV., 5. 2004, St. Jakl lgt .’ PARATYPES: 3 JJ (nos. 1–3), ♀ (no. 7), same label data as holotype ( SJPC) ; J (no. 4): ‘ Indonesia, Mentawai Isls., SIBERUT ISL., south, 20 – 100 m, SALAPPA VILL. ENV., 3. 2005, St. Jakl lgt.’ ( SJPC) ; J (no. 5), ♀ (no. 12): ‘ Ind., W. Sumatra prov., Mentawai Islands, Siberut isl. , 9. 1995’ ( SJPC) ; ♀ (no. 6): ‘ Indonesia, Mentawai Isls., SIBERUT ISL., north, 50-200 m, BOJAKAN VILL. ENV., 3. 2005, St. Jakl lgt.’ ( SJPC) ; 3♀♀ (nos. 8–10): ‘ Indonesia, Mentawai Isls., SIBERUT ISL., south, 0 – 50 m, SALIGUMA VILL. ENV., 10. 1993, local collectors lgt.’ ( NMPC, SJPC) ; ♀ (no. 11): ‘ Indonesia, Mentawai Isls., SIBERUT ISL., south, 0 – 50 m, SALIGUMA VILL. ENV., 10. 1996, local collectors lgt.’ ( SJPC) ; 4 JJ (nos. 12–15), ♀ (no. 16): ‘ Indonesia, Mentawai Isls., N. SIBERUT Isl., 150 m, BOJAKAN vill. env., 122006, St. Jákl lgt.’ ( SJCP) .

Description. Holotype length 29.7 mm, maximum humeral width 13.5 mm. Body coppery greenish-gold with purpureous lustre.

Head. Dark green with golden-green lustre, widest in apical third. Frons with several simple, large punctures and dense micropunctures. Punctation of clypeus more rugose, some punctures confluent. Apex of clypeus deeply incised. Scape dark green, rest of antenna black. Setation of antenna blackish.

Pronotum. Dark green with strong golden-purpureous lustre. Lateral sides with large simple punctures, finer simple punctures present throughout length, very fine micropunctures densely and regularly placed throughouth pronotal surface. Laterally bordered throughout length. Termination of pronotal lobe obtuse.

Scutellum. Small, sharply triangular, with micropunctation. Glabrous midline present.

Elytra. Shape similar to nominotypical subspecies, but more parallel-sided. Dark green with strong golden-purpureous lustre.Apex and part of apical calli wrinkled.Apical two-thirds of sides also with similar wrinkles. Rest of surface with eight to nine longitudinal punctured lines. Apical calli obtuse, glabrous, shining. Humeral calli indistinct, with several irregularly shaped impressions. Epipleura developed in basal third. Sutural ridge flat in basal half, mildly and obtusely elevated in apical half, its termination sharply pointed, very shortly protruding over elytral apex.

Pygidium. Dark green, reflective, wrinkled throughout length.

Venter.Abdomen dark green with metallic reflection, which is more visible in anterior part of each ventrite. Sides of each ventrite with few wrinkles, middle parts with transverse line of fine punctures. Medial furrow developed, shallow but rather wide. Metasternum almost glabrous medially (dense micropunctation present), finely wrinkled along sides. Mesometasternal process robust, protruding to level of procoxae, its end sharply pointed and bent downwards. Prosternum and mentum dark green to blackish, slightly reflective, both wrinkled.

Legs. Femora, tibiae and tarsi green, reflective, setation blackish. Coxae black. Protibia tridentate, anterior teeth small, obtuse, but distinctly developed. Meso- and metatibiae with fine carina approximately in posterior third of length.

Male genitalia. Similar to other subspecies ( Figs. 6d–e ).

Variability. Body length 27.2–31.2 mm. In other aspects all specimens similar to holotype. Sexual dimorphism. Body length of females 27.2–32.1 mm. Body wider and more robust. Punctation and wrinkling on head, pronotum and elytra generally more developed, deeper and denser. Protibia wider, tridentate, proximal tooth large and sharp.

Differential diagnosis. The new subspecies differs from the nominotypical subspecies by its smaller size, finer punctation of the pronotum and elytra, less developed striolation of elytral lateral margins, and golden-purpureous lustre of the dorsum (bright golden-green in the nominotypical subspecies). From Thaumastopeus striatus krikkeni Allard, 1995 , described from Nias Island, it differs by the presence of pronotal and elytral punctation (subspecies from Nias has the dorsum almost glabrous) and general shape of the body, which is wider and not so parallel-sided.

Etymology. Named after Siberut Island.

Distribution. Siberut Island, Mentawai Archipelago, Indonesia.

Figures

Figs. 6–7. 6 – Thaumastopeus striatus siberutanus subsp. nov.; 7 – T. pugnator insulanus subsp. nov. a – habitus dorsally; b – habitus laterally; c – habitus ventrally; d – aedeagus apically; e – aedeagus laterally. Not in scale.