Chrysodema (Chrysodema) lewisii nakatai, Frank & Sekerka, 2020

Frank, David & Sekerka, Lukáš, 2020, Studies on the genus Chrysodema (Coleoptera: Buprestidae: Chrysochroinae) part I., Zootaxa 4720 (1), pp. 1-62 : 16-17

Chrysodema (Chrysodema) lewisii nakatai subsp. nov.

urn:lsid:zoobank.org:act:AE24D928-41D0-4B41-87F7-B9FB0C716D02

( Figs 4–6 , 75 )

Chrysodema lewisii: Miwa (1933) : 6 (ex parte, faunistics: Iriomote); Miwa (1936): 11 (ex parte, faunistics: Taiwan); Miwa & Chûjô (1936): 3 (ex parte, catalogue); Miwa & Chûjô (1940): 54 (ex parte, distribution and faunistics); Ong & Hattori (2019): 18 (diagnosis, iconography).

Chrysodema lewisii ab. nagaokai Kurosawa (1954): 30 (infrasubspecific name, ex parte).

Chrysodema (Chrysodema) lewisii [ex parte]: Mühle (2003): 45 (noted); Kubáň (2006): 345 (catalogue); Bellamy (2008): 533 (catalogue); Kubáň (2016): 460 (catalogue).

Type locality. Japan, Okinawa Prefecture, Yaeyama Islands, Iriomote Island, Funaura .

Type material examined. HOLOTYPE: ♂, ‘Funaura / Iriomote Is. / Okinawa Pref. / JAPAN / 27, V, 2016 / Tadafumi NAKATA lgt. [w, p]’ ( NMPC). PARATYPES (14 ♂♂, 17 ♀♀): JAPAN: Iriomote Island: 2 ♂♂, 3 ♀♀, same data as holotype (2 ♂♂, 2 ♀♀ DFPC; 1 ♀ VKSC); 1 ♂, ‘J. Haupt / Funaura / Iriomote / 1996 - 5 - 27 [w, p] // cf. Chrysodema / manillarum / Thomson [w, h] // Chrysodema (s. str.) / lewisii Saund. / det. S. Gottwald 2010 [w, p]’ ( MFNB); 1 ♀, ‘S JAPAN, RYUKU / IRIMOTE ISL. 30.V. / Yaeyama 1999 [w, h] // Chrysodema / lewisii / Saund / Dét. T. LANDER 2007 [w, h/p]’ ( EJBS); 1 ♀, ‘INABA / IRIOMOTE ISL. / JAPAN - 14.VII. 1970 / C.(Coll.) G. MINET [w, h/p] // [dorsal side]: comparé / au Type [r, p]; [ventral side]: ab. nagaokai / NSMT 6.2000 [r, h] // Chrysodema / lewisi / ab. nagaokai / Kur. / Dét. T. LANDER 1999 [w, h/p]’ ( MHNG). Ishigaki Island: 3 ♂♂, 3 ♀♀, ‘Mt. Yarabu-dake / Ishigaki Is. / Okinawa Pref. / JAPAN / 4, VII, 2016 / Tadafumi NAKATA lgt. [w, p]’ ( DFPC); 2 ♂♂, ‘mt.yarabedake / is.ishigaki // 7-6-2002 / i.douge leg. [w, p]’ ( SGBG). Yonaguni Island: 1 ♀, ‘Mt. Urabe, Is. Yonaguni / 10. VII. 1964 / N. Ohbayashi leg. [w, p] // Chrysodema / lewisii / E. SAUNDERS / det. K. Akiyama, 1984 [w, h/p]’ ( WBWA), 3 ♂♂, 3 ♀♀, ‘Mantabaru Forest Park / Yonaguni Is. / Okinawa Pref. / JAPAN / 30, VI, 2017 / Tadafumi NAKATA lgt. [w, p]’ ( DFPC); 1 ♀ ‘Urabe-dake / (Is.Yonaguni) / 9. VI. 1973 / K. Masaki leg. [w, h] // Chrysodema / lewisii Saund. / det. Akiyama 1978 [w, p]’ ( ATMR, coll. R. Novak. TAIWAN: 2 ♀♀, ’ 05-VII-2014 / TAIWAN: Yilan Co., / Nanao Farm / F. S. Hu leg. [w, h] // Host plant: / Terminalia catappa [w, h]’ ( FSHC, NCHU); 3 ♂♂, ‘TAIWAN: New Taipei / City, Tucheng / 30-VI-2006 / Fengji Zheng leg. [w, h/p]’ ( TARI, DFPC, NMPC); 2 ♀♀, ‘TAIWAN: Taipei City / Old Tianmu Hiking / Trail, 14-VIII-2017 / Chewei Kuo leg. [w, h/p]’ ( TARI). All specimens were provided with an additional red printed label: ‘ HOLOTYPE [or PARATYPE respectively] [sex] / Chrysodema (Chrysodema) / lewisii / nakatai subsp. nov. / David Frank & / Lukáš Sekerka det. I. 2019 [date handwritten]’.

Description of holotype. Well preserved ♂ specimen with all appendages. Length 18.25 mm, width 6.50 mm, length/width ratio: 2.81.

Body generally metallic green, sub-matt. Impunctate (or micropunctate) areas on dorsal side dark blue. Pronotum generally with bright metallic green macropunctation. Punctation on elytra bright metallic green, and elytra appears to have yellow irregular stripes; principal and lateral impressions bright golden-green; lateral margin bluish-green. Ventral side bright metallic green. Legs including tarsi metallic green, ventral pads black, basally brown. Labrum, maxillae and labium including palpi yellow. Scape and pedicel metallic, remaining antennomeres brownish-black.

Pronotum moderately densely macropunctate with narrow and sparsely micropunctate interspaces. Macropunctation laterally gradually coarser and denser. Macropunctures in central part moderately large with large fovea; often several punctures connected and forming short impressed lines. Medial line well visible, very sparsely micropunctate, apparently elevated due to coarse punctation in medial impression. Medial impressions shallow but distinct. Principal impressions shallow and weakly delimited from disc. Lateral impressions absent. Lateral margin rounded, distinct in basal 3/4.

Elytra regularly convex generally smooth, without costae, with lateral and small principal impression; base with moderately impressed rows of punctures thus intervals appear slightly but distinctly elevated for short distance. Intervals 2 and 4 more or less elevated on apical 1/4, uniting on apical 1/6 and continuing as single costa (interval 6). Interval 8 elevated along entire length forming moderately broad rounded costa. Area between intervals 6 and 8 shallowly but distinctly impressed, with condensed wax layer thus appears like elongate opaque yellow stripe. Sutural interval gradually elevated towards apex and with row of punctures along suture. Punctation irregular. Internally (up to position of imaginary interval 6) formed by irregularly dispersed groups of 2–6 punctures and confusedly arranged additional separate punctures. Groups of punctures more or less gradually impressed from postscutellar area towards lateral sides and apex. Interspaces circa 1–2 × as wide as puncture diameter, very sparsely micropunctate, micropunctures hardly visible at magnification 50 ×. Punctation between position of imaginary interval 6 and interval 8 completely irregular, dense and coarse but punctures smaller than these on other parts of disc, interspaces narrower than puncture diameter and with transverse wrinkles thus whole area of lateral impression appears rugose. Interval 8 very sparsely punctate, punctures of same size as in central part of disc. Punctures externally of interval 8 smaller, subapproximate to those in lateral impression but more sparse. Epipleura in basal 1/4 broad, appears rugose due to transverse punctures, moderately densely punctate; in narrowing, continuous, with small obtusely angled tooth.

Mid and hind femora moderately densely punctate; fore femora distinctly more sparsely punctate and more shiny.

Ventral side of body ( Fig. 5 ) overall coarsely and very densely punctate, only central parts of thoracic ventrites sparsely punctate. Lateral sides of all abdominal ventrites very densely and moderately coarsely punctate ( Fig. 6 ).

Aedeagus length: 5.00 mm, width: 1.28 mm, length/width ratio: 3.91. Apices of parameres subtruncate, inner tip angular. Penis broadly-oval, in ventral view with shallow and linear impression along midline, lateral sides with deep canaliculus, which has dorsal side much broader than ventral ( Fig. 75 ).

Variation. Body ♂♂ (n=12) length: 17.00–19.50(21.00) mm, width: 5.75–7.25 mm, length/width ratio: 2.69– 3.00; ♀♀ (n=11): length: 18.25–21.75(24.25) mm, width: 6.25–8.50 mm, length/width ratio: 2.62–2.92. Approxi- mately half of studied specimens have dorsum with dark purple tint. Principal impression on elytra of variable size from moderately large to very small (5 ♂♂ and 5 ♀♀) or absent (7 ♂♂ and 6 ♀♀). Structure of elytra and pronotum nearly constant.

Aedeagus (n=9) length: 4.78–5.11 mm, width: 1.06–1.28 mm, length/width ratio: (3.91)4.35–4.78.

Differential diagnosis. The new subspecies can be easily separated from the nominotypical one by having semi-matt and usually dark blue dorsum with green punctation (vs. strongly shiny and green or green-purple dorsum); the surface of elytra and pronotum is subrugose due to coarser and denser punctation and more elevated intervals (vs. smoother and without elevated costae); and apices of parameres subtruncate with inner tip angular (vs. evenly rounded without sharp inner angle). For summary see Table 1 on page 11.

Biology. According to the label data beetles feed on Terminalia catappa L. ( Combretaceae ).

Etymology. This species is dedicated to Tadafumi Nakata, Japanese entomologist and collector of most of the type series, who kindly provided us with specimens.

Distribution. Japan (Yaeyama Islands) and Taiwan.

Remarks. Kurosawa (1954) described the aberration nagaokai based on two specimens from Kumejima and Ishigaki (see also Remarks in nominotypical subspecies). We did not study the original material but almost certainly the specimen from Ishigaki belongs to the subspecies C. (C.) lewisii nakatai subsp. nov. Since the name is infrasubspecific it does not interfere with the description of the new subspecies.

Miwa (1936) recorded C. (C.) lewisii from Taiwan. We did not have opportunity to study the original material Miwa reported but we examined five specimens recently collected in northern Taiwan and they certainly belong to the new subspecies.

Kurosawa (1954) provided a map showing distribution of C. (C.) lewisii . He marked occurrence in northern and southern Taiwan, however, this is not correct. Chrysodema (C.) lewisii is in Taiwan restricted to the north and in the south is C. dalmanni Mannerheim, 1837 (U. Ong, pers. comm. 2018).

Figures

FIGURES 1–6. Chrysodema, general aspect: 1–3—C. (C.) lewisii lewisii Saunders, 1873 (holotype, ♂ 19.50 mm). 4–6—C. (C.) lewisii nakatai subsp. nov. (holotype, ♂ 18.25 mm). 1, 4—dorsal view; 2, 5—ventral view; 3, 6—lateral view.

FIGURES 73–95. Chrysodema, genitalia and terminal abdominal segments. 73—Chrysodema (Chrysodema) sonnerati Laporte de Castelnau & Gory, 1835 (Sri Lanka, MHNG); 74—C. (C.) lewisii lewisii Saunders, 1873 (holotype); 75—C. (C.) lewisii nakatai subsp. nov. (holotype); 76—C. (C.) tonkinea Kerremans, 1909 (lectotype); 77—C. (C.) vrabeci sp. nov. (holotype); 78—C. (C.) aeneoviolacea Deyrolle, 1864 (Kai Is., MHNG); 79—C. (C.) dany sp. nov. (holotype); 80—C. (C.) sibuyanica Fisher, 1924 (Sibuyan Is., NMPC); 81—C. (C.) wallacei Deyrolle, 1864 (Ambon Is, MNHN); 82—C. (C.) dohrnii Saunders, 1874 (Mindanao Is., DFPC); 83—C. (C.) fuscitarsis Kerremans, 1895 (Palawan Is., MNHN); 84—C. (C.) gottwaldi sp. nov. (holotype); 85—C. (Pseudochrysodema) coelestina Obenberger, 1922 (lectotype); 86—C. (P.) instabilis Deyrolle, 1864 (Halmahera Is., DFPC); 87—C. (C.) dohrnii (ibid., DFPC); 88—C. (C.) fuscitarsis (ibid., MNHN); 89—C. (C.) gottwaldi sp. nov. (holotype); 90, 91—C. (C.) aurostriata (lectotype); 92, 93—C. (C.) tonkinea (Hoa Binh, DFPC); 94, 95—C. (C.) vrabeci sp. nov. (Ban Huay Kon, MOOC). 73–79, 85–86—tegmen, parameres and penis; 80–84—aedeagus; 87–89—male ventrite VIII; 90, 92, 94—female ventrite VIII; 91, 93, 95—female tergite VIII. The scale bar does not apply to Figs 87–95.