Chrysodema (Gelaeus) cyanicollis Kerremans, 1900

Frank, David & Sekerka, Lukáš, 2016, Revision of the subgenusGelaeus of Chrysodema (Coleoptera: Buprestidae: Chrysochroinae), Acta Entomologica Musei Nationalis Pragae 56 (2), pp. 671-719 : 681-682

Chrysodema (Gelaeus) cyanicollis Kerremans, 1900 , assign. nov.

( Figs 42–44 )

Chrysodema cyanicollis Kerremans, 1900: 62 (original description). KERREMANS (1903):75 (catalogue); OBENBERGER (1926): 131 (catalogue).

Chrysodema (Chrysodema) cyanicollis: KERREMANS (1909) :518 (key), 567 (redescription); LANDER (2003): 13 (key), 17 (redescription), Fig. 7 (colour photograph); BELLAMY (2008): 529 (catalogue).

Type locality. Indonesia, South Sulawesi Province, Selayar Islands, Tanahjampea (or Jampea or Djampea) Island.

Type material examined. HOLOTYPE (by monotypy): ♀, ‘DJAMPEA, / Dec 95. / A. Everett [w, p] // Chrysodema / cyanicollis / Kerr. Type [w, h] // cyanicollis Kerr. [w, h] // Coll. / Jul. Moser // Chrysodema / cyanicollis / Kerr. / Det. T. LANDER 2000’ ( MFNB). Specimen provided with an additional red printed label: ‘HOLOTYPE (by monopyty) / Chrysodema (Gelaeus) / cyanicollis / KERREMANS, 1900 ♀ / David Frank & / Lukáš Sekerka labeled 2016 [year handwritten]’.

Additional material examined. INDONESIA: SOUTH SULAWESI PROV.: ‘ Celebes, Somarisi’ [probably Somarisi on Selayar Island 16 km S offshore of Sulawesi], 1 ♀ ( MHNG), 1 ♀ ( DFPC). EAST NUSA TENGGARA PROV.: Lembata [ or Lomblen ] Island, 1 ♀ ( MHNG).

Redescription of holotype. Preserved ♀ specimen with all tarsi partly broken. Length 27.00 mm, width 9.50 mm, length/width ratio: 2.84.

Head green with slight golden and bluish reflections. Pronotum brightly bluish-green, gradually more bluish towards base, punctation in impressions green. Scutellum bright bluishgreen. Elytra bluish-black, only lateral impressions and two outer rows of punctures dark copper-green ( Fig. 42 ). Ventral side bright green gold, legs green, femora with bluish tint, tarsi metallic green with bluish tint ( Fig. 43 ).

Pronotum in general coarsely and moderately densely punctate. Medial line well marked, impunctate. Medial impressions barely impressed, moderately densely punctate, punctures slightly smaller than those lateral to them. Principal impressions moderately deep, elongate, not connected to basal impressions, apparently impunctate only with row of very fine punctures. Lateral impressions shallow and punctate. Basal impressions moderately deep, subtriangular.

Elytra moderately and quite densely punctate, with shallow lateral impressions present as round groups of coarser and paler coloured punctures. Posterior impression larger than anterior and somewhat more impressed ( Fig. 44 ). Puncture rows visible from base to apex, distinctly impressed on apical 2/3, more or less regularly arranged, and irregularly double in apical half. Punctures in rows V–VIII in middle third of elytra more or less regularly arranged, not grouped, inner rows somewhat less regular; spaces 1–2× as broad as diameter of punctures, flat not reticulate. Intervals basally flat, not elevated, broad, approximately 3–4× as wide as rows of punctures, impunctate; apically and laterally slightly elevated and punctate.

Mid femora in central part strongly shiny, sparsely punctate with fine punctures, on sides punctures smaller but coarser and densely arranged.

Ventral side of body ( Fig. 43 ) overall coarsely and quite densely punctate, only central parts of thoracic and abdominal ventrites sparsely punctate. Lateral side of abdominal ventrite I moderately dense and coarsely punctate; ventrites II to V gradually more sparsely punctate in apical half.

Variation. Body ♀♀ (n = 4) length: 25.50–27.50 mm, width: 8.75–9.75 mm, length/width ratio: 2.82–3.00. Known only from female specimens. Pronotum metallic green, green with purple tint or bluish-green. Elytra from bluish-black to dark blue or green. Ventral side metallic green to golden-green. Structure of pronotum and elytra quite uniform in examined specimens, only one specimen with denser and coarser punctation and moderately deep medial impression.

Differential diagnosis. Chrysodema (G.) cyanicollis belongs among species with distinctly dichromatic dorsal side having pronotum brighter coloured than elytra, latter in tones of green or blue. All similar taxa ( C. (G.) walkeri , C. (G.) sara sp. nov., C. (G.) katka sp. nov. and C. (G.) cupriventris ) differ in pale coloured tarsi, at most with terminal tarsomere metallic while C. (G.) cyanicollis has tarsi uniformly metallic green. The uniformly green specimen (from Lembata Is.) of C. (G.) cyanicollis is also very similar to C. (G.) florensis as both have metallic tarsi and distinct lateral impressions on elytra. It can be distinguished by lateral sides of abdominal ventrites II–III variously punctate with large impunctate areas ( Fig. 4 ) while C. (G.) florensis has them densely and uniformly punctate without impunctate areas ( Fig. 5 ).

Distribution. Indonesia: South Sulawesi Prov.: Tanahjampea (or Jampea) Is., Selayar Is. and East Nusa Tenggara Prov.: Lembata Is.

Remarks. KERREMANS (1900) described Chrysodema cyanicollis from the collection of Meyer Darcis and explicitly mentioned only a single female specimen with size ‘Long., 26; larg., 8,5 mill.’. The latter collection was purchased by Julius Moser and is nowadays deposited in MFNB. The holotype is however somewhat larger (27.0 × 9.5 mm) than indicated in the original description. Nevertheless, we consider it as a mistake as the specimens otherwise perfectly fits the original description.

Chrysodema (G.) cyanicollis was until now placed in the nominotypical subgenus, however, it posses deep triangular basal impression of the pronotum typical for Gelaeus and therefore we assign it to the latter subgenus.

The uniformly green specimen from Lembata resembles C. (G.) florensis , however, in our opinion it is morphologically more similar to C. (G.) cyanicollis despite considerable geographic separation. More specimens from Selayar Islands and Lembata Island are necessary to verify its identity.

Figures

Figs 42–47. 42–44 – Chrysodema (Gelaeus) cyanicollis Kerremans, 1900 (holotype ♀, 27.00 mm). 45–47 – C. (G.) sara sp. nov. (holotype ♂, 24.00 mm). 42, 45 – dorsal view; 43, 46 – ventral view; 44, 47 – lateral view.

Figs 6–11. 6–8 – Chrysodema (Gelaeus) florensis Lansberge, 1880 (lectotype ♂, 25.75 mm). 9–11 – C. (G.) foraminifera Lansberge, 1879 (lectotype ♀, 25.25 mm). 6, 9 – dorsal view; 7, 10 – ventral view; 8, 11 – lateral view.

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.