Chrysodema (Gelaeus) walkeri subsp. horaki Frank & Sekerka 2016, subsp. nov.
Creators: name: Frank, David
name: Sekerka, Lukáš
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Buprestidae
Chrysodema
Chrysodema walkeri
Chrysodema (gelaeus) walkeri horaki

description: Chrysodema (Gelaeus) walkeri horaki subsp. nov.
(Figs 27–29, 63)
Type locality. Indonesia, Maluku Province, Leti Island.
Type material. HOLOTYPE: ♂, ‘ Indonesia, SW Molucas / LETI ISL, 3.2009 / TUTUWARU vill env. / local collecors lgt [w, p]’ (NMPC). PARATYPES (63 ♂♂ 117 ♀♀): 53 ♂♂ 77 ♀♀, same data as holotype (3 ♀♀ NMPC, 1 ♂ HMMG, 1 ♂ 1 ♀ SGBG, 1 ♂ 1 ♀ VKSC, 1 ♂ 1 ♀ SVVC, 1 ♂ 1 ♀ MHNG, 1 ♂ 1 ♀ IRSN, 2 ♂♂ 2 ♀♀ MFNB, 1 ♂ 1 ♀ LSPC, 10 ♂♂ 11 ♀♀ DFPC, 34 ♂♂ 55 ♀♀ SJPC); 10 ♂♂ 40 ♀♀, ‘LETI ISL. / 8-9.2010 / ALEX P’ (3 ♂♂ 8 ♀♀ DFPC, 7 ♂♂ 32 ♀♀ SJPC). All specimens provided with an additional red printed label: ‘ HOLOTYPE [or PARATYPE respectively] [sex] / Chrysodema (Gelaeus) / walkeri / horaki subsp. nov. / David Frank & / Lukáš Sekerka des. 2016 [year handwritten]’.
Description of holotype. Well preserved ♂ specimen with all appendages. Length 26.00 mm, width 9.25 mm, length/width ratio: 2.81. Body strongly shiny. Body colouration as in the nominotypical subspecies but elytra dark blue including apex without purple reflections (Figs 27, 29). Whole tarsi brown, only claws metallic.
Pronotum in general coarsely and densely punctate. Medial line well marked, impunctate. Medial impressions distinctly impressed on both sides, coarsely and densely punctate, punctures subequal to those on disc. Principal impressions oval and shallow, not sharply bordered, well separated from basal impressions, with small dense punctation. Lateral impressions oval, shallow, punctate. Basal impression large and triangular.
Elytra with slightly marked posterior 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 quite densely and irregularly arranged, not forming isolated groups; spaces approximately as broad as puncture diameter, slightly elevated, not reticulate (Fig. 29). Intervals basally flat, not elevated, broad, approximately 4× as wide as rows of punctures, with several confused punctures; apically and laterally strongly narrowed, somewhat elevated and punctate.
Ventral side (Fig. 28) 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. 63) length 6.94 mm, width 1.38 mm, length/width ratio: 5.03. Apex of parameres horizontally truncate. Penis elongate, slightly rounded on sides.
Variation. Body ♂♂ (n = 47) length: (21.25)23.25–30.25(31.50) mm, width: (7.75)8.75– 11.00(11.50) mm, length/width ratio: (2.56)2.65–2.84(2.88); ♀♀ (n = 86) length: (26.50)27.50–34.75(38.00) mm, width: 10.00–13.50(14.50) mm, length/width ratio: (2.43)2.52–2.83.
Pronotum green with golden or copper tint, exceptionally with more or less bluish tint. Medial impressions on pronotum variously impressed thus medial line in some specimens looks elevated. Lateral punctation on pronotum coarser in larger specimens. Lateral impressions on elytra variable, often absent, if present small and very shallow.
Aedeagus (n = 7) length: 6.38–7.91 mm, width 1.33–1.53 mm, length/width ratio: (4.80)5.03–5.10(5.24). Apex of parameres rounded. Penis elongate, subparallel-sided.
Differential diagnosis. Among the subspecies of C. (G.) walkeri this one is easily distinguished by small and very dense punctation of elytra, particularly in apical third, where punctures are almost touching each other, while other subspecies have distinct intervals. The subspecies C. (G.) walkeri kubani subsp. nov. also has dense punctation of elytra but still has distinct intervals in apical third and is much more sculptured. Chrysodema (G.) walkeri horaki subsp. nov. has also completely irregular punctation in rows V–VIII without distinct intervals (more or less distinct in other subspecies). For additional characters see Table 1.
Etymology. This species is named after Jan Horák (Prague, Czech Republic), a well-known specialist in Mordellidae.
Distribution. Indonesia: Maluku Prov.: Leti Is.
description: Published as part of Frank, David & Sekerka, Lukáš, 2016, Revision of the subgenusGelaeus of Chrysodema (Coleoptera: Buprestidae: Chrysochroinae), pp. 671-719 in Acta Entomologica Musei Nationalis Pragae 56 (2) on pages 709-710, DOI: 10.5281/zenodo.5310800