Chrysodema (Gelaeus) walkeri bilyi, Frank & Sekerka, 2016

Frank, David & Sekerka, Lukáš, 2016, Revision of the subgenusGelaeus of Chrysodema (Coleoptera: Buprestidae: Chrysochroinae), Acta Entomologica Musei Nationalis Pragae 56 (2), pp. 671-719 : 708-709

Chrysodema (Gelaeus) walkeri bilyi subsp. nov.

( Figs 1–2 , 36–38 , 66 )

Type locality. Indonesia, Maluku Province, Tanimbar Islands, Selaru Island .

Type material. HOLOTYPE: ♂, ‘ Selaru / Jan. 2010 [w, p]’ ( NMPC). PARATYPE: 1 ♀, same data as holotype ( DFPC). Both specimens provided with an additional red printed label: ‘ HOLOTYPE [or PARATYPE respectively] [sex] / Chrysodema (Gelaeus) / walkeri / bilyi subsp. nov. / David Frank & / Lukáš Sekerka des. 2016 [year handwritten]’.

Description of holotype. Well preserved♂ specimen, left antenna missing from antennomere VII, right from antennomere IV. Length 28.50 mm, width 9.75 mm, length/width ratio: 2.92. Body weakly shiny. Head, pronotum and scutellum bluish-green, elytra dark blue, apex with purple reflections ( Fig. 36 ). Ventral side dark green with golden reflections ( Fig. 37 ). Legs green with strong bluish luster, whole tarsi brown, only claws metallic.

Pronotum in general coarsely and densely punctate. Medial line well marked, impunctate and somewhat elevated. Medial impressions distinctly impressed on both sides, coarsely and densely punctate, punctures smaller than those on disc. Principal impressions elongate and shallow, not sharply bordered, well separated from basal impressions, with small dense punctures. Lateral impressions oval, shallow, punctate. Basal impressions large and oval.

Elytra without lateral impressions, moderately strongly punctate. Rows visible from base to apex, weakly impressed and irregularly double in apical half, internal rows more or less regularly arranged, external irregular. Punctures in rows V–VIII in middle third of elytra more or less regular, not forming isolated groups; spaces 2–3× as broad as puncture diameter, slightly elevated, not reticulate ( Fig. 38 ). Intervals basally flat, not elevated, broad, approximately 5× as wide as rows of punctures, impunctate; apically and laterally strongly narrowed, slightly elevated and at most with a few additional punctures.

Ventral side ( Fig. 37 ) including legs as in nominotypical subspecies. Only lateral sides of abdominal ventrites II–V densely punctate in basal half and very sparsely punctate in apical half; punctures moderately large, subequal in size.

Aedeagus ( Fig. 66 ) length 7.60 mm, width 1.43 mm, length/width ratio: 5.32. Apex of parameres obliquely truncate. Penis elongate, parallel-sided.

Variation. Body ♀ (n = 1) length: 30.25 mm, width: 11.00 mm, length/width ratio: 2.75. Head, pronotum and scutellum with golden reflections in general and copper reflections in impressions. Elytra blue with slightly greenish shade. Underside with copper reflections, and abdomen with purple reflections. Pronotum with denser and more numerous punctures, particularly between medial and principal impressions. Internal rows of elytra slightly more impressed in basal 1/6 length.

Differential diagnosis. Chrysodema (G.) walkeri bilyi subsp. nov. do not posseses any striking character like other subspecies but has the slimmest penis. It has dull underside of body like C. (G.) walkeri kubani subsp. nov. and C. (G.) walkeri nigriventris subsp. nov. and looks morphologically intermediate between them as it has less sculptured elytra with sparser punctation than C. (G.) walkeri kubani but more than C. (G.) walkeri nigriventris . However, C. (G.) walkeri bilyi is widely separated geographically, the only taxon of the C. (G.) walkeri species-group occurring on Tanimbar Islands while the two latter occur on Moa and nearby Romang islands. For additional characters see Table 1 .

Etymology. This species is dedicated to Svatopluk Bílý (Prague, Czech Republic), a wellknown specialist in Buprestidae , particularly Anthaxiini .

Distribution. Indonesia: Maluku Prov.: Tanimbar Isls.: Selaru Is.

Figures

Figs 1–5. Morphological details of the subgenus Gelaeus Waterhouse, 1905. 1–2 – dorsal and lateral aspects of pronotum of Chrysodema (G.) walkeri bilyi subsp. nov. (holotype); a – basal impression, b – principal impression, c – medial impression, d – lateral impression. 3–5 – abdominal ventrites II–III. 3 – C. (G.) cupriventris (Kerremans, 1898), 4 – C. (G.) walkeri nigriventris subsp. nov., 5 – C. (G.) florensis Lansberge, 1880.

Figs 36–41. 36–38 – Chrysodema (Gelaeus) walkeri bilyi subsp. nov. (holotype ♂, 28.50 mm). 39–41 – C. (G.) walkeri kubani subsp. nov. (holotype♂, 27.50 mm). 36, 39 – dorsal view; 37, 40 – ventral view; 38, 41 – lateral view.

Figs 56–71. Parameres and penis. 56 – Chrysodema (Gelaeus) florensis Lansberge, 1880 (lectotype); 57 – C. (G.) foraminifera Lansberge, 1879 (Timor Is., RMNH); 58 – C. (G.) iris iris (Kerremans, 1898) (lectotype); 59 – C. (G.) iris moluensis Novak, 2010 (topotype); 60 – C. (G.) oborili oborili sp. nov.(holotype); 61 – C. (G.) oborili laratensis subsp. nov. (holotype); 62 – C. (G.) walkeri walkeri (Waterhouse, 1892) (Damar Is.); 63 – C. (G.) walkeri horaki subsp. nov. (holotype); 64 – C. (G.) walkeri rejzeki subsp. nov. (paratype); 65 – C. (G.) walkeri nigriventris subsp. nov.(holotype); 66 – C. (G.) walkeri bilyi subsp.nov.(holotype); 67 – C. (G.) walkeri kubani subsp. nov. (holotype); 68 – C. (G.) sara sp. nov. (holotype); 69 – C. (G.) cupriventris (Kerremans, 1898) (Wetar Is., DFPC); 70 – C. (G.) katka sp. nov. (holotype); 71 – C. (G.) wetteriana (Théry, 1935) (lectotype).