Diplopherusa yonaguniensis, Murakami, 2016

Murakami, Hiroyuki, 2016, Review of the generaDiplopherusa and Paracladiscus (Coleoptera: Cleridae: Tillinae) from Japan and Taiwan, with descriptions of two new species, Acta Entomologica Musei Nationalis Pragae 56 (2), pp. 725-741 : 729

Diplopherusa yonaguniensis sp. nov.

( Figs 1 , 10 , 25, 31, 37 , 43, 44, 61)

Type locality. Japan, Okinawa Prefecture, Yaeyama Islands, Yonaguni-jima.

Type material. HOLOTYPE: J, ‘[JPN: Okinawa] alt. 70m (light) | Mandabaru-shinrinkôen, | Yonaguni-cho, Yaeyama-gun | 24°27′31.77″N 122°58′31.31″E | 2–V–2016 Hiroshi Ikeda leg.’ ( EUMJ) . PARATYPE: 1J, ‘Sonai | Yonagunijima | 21. V. 1989 | N. Ohbayashi leg.’ ( EUMJ).

Description. Male ( Fig. 1 ). Head, pronotum, pterothorax in ventral view, and femora dark blue and moderately shiny; basal 1/3 of elytra yellow; antennae, apical 2/3 of elytra, tibiae, tarsi brownish-black.

Measurements (n = 2): EyW: 0.30 mm; EyD: 0.70–0.72 mm; BL: 5.87–6.37 mm; PL: 1.55–1.73 mm; PW: 1.13–1.18 mm; EL: 4.32–4.64 mm; EW: 1.40–1.43 mm.

Head convex dorsally, with fine setigerous punctation; EyD/EyW: 2.37–2.40. Terminal palpomeres of maxillary palpi short and digitiform; those of labial palpi widely triangular, their length equal to 1/3 of width of apical margin of terminal palpomeres. Antennae ( Fig. 10 ) longer than total length of head and pronotum combined; antennomere I swollen and bent; II compact; III–X biramous; XI flattened, fusiform. Approximate length ratio of antennomeres (n = 1): 2.3: 1.0: 2.8: 2.6: 3.1: 2.8: 2.8: 2.8: 2.8: 2.6: 5.6. Relative length ratio of rami of antennomeres III–X (n = 1): 1.0: 1.3: 1.6: 1.5: 1.5: 1.4: 1.4: 1.2.

Pronotum widest before apex, constricted in basal 1/3; surface covered with fine and rather sparsely distributed setigerous punctures; pronotal projections reaching to procoxal projections; PL/PW: 1.37–1.47.

Elytra elongate, mostly parallel-sided, widest at humeri, large and deep punctation arranged in rows of punctures not extended to apex; intervals slightly smaller than puncture diameter and with pubescence; EL/EW: 3.09–3.26, EL/PL: 2.69–2.79, EW/PW: 1.21–1.24.

Unguis with basal denticles; metatibiae apically dilated to near apex, thence weakly nar- rowed, densely covered with pubescence on posterior inner surface.

Pygidium ( Fig. 25 ) rounded posteriorly; pygidial struts anteriorly extended. Sternite VIII ( Fig. 31 ) semicircular, weakly pigmented in middle. Spicular fork ( Fig. 37 ) with intraspicular plate.

Connecting membrane between tegmen and phallus with fine spines (Figs 43–44); tegmen shorter than phallus; phallobasic struts developed; phallobasic apodeme slightly longer than phallobase.

Female. Unknown.

Differential diagnosis. The new species is similar to D. kitamurai , but is distinguished by the following characters: punctation of pronotum sparse; apical half of elytra black; EyD/EyW: 2.40; tibiae brownish black and rather elongate; male pygidial struts extended anteriorly; abdominal sternite VIII semicircular in male.

Etymology. The species name is derived from the type locality, Yonaguni-jima.

Distribution. Japan: Okinawa Prefecture: Yaeyama Islands: Yonaguni-jima ( Fig. 61 ).

Figures

Figs 1–5. Habitus of Diplopherusa spp (1–4 – male; 5 – female). 1 – Diplopherusa yonaguniensis sp. nov., holotype; 2 – D. ahsini Yang & Yang, 2013; 3 – D. kitamurai Nakane, 1989; 4–5 – D. shibatai (Miyatake, 1965). Scale bars: 2.0 mm.

Figs 10–18. Antennae (10–13, 15, 17 – male; 14, 16, 18 – female). 10 – Diplopherusa yonaguniensis sp. nov.; 11 – D. ahsini Yang & Yang, 2013; 12 – D. kitamurai Nakane, 1989; 13–14 – D. shibatai (Miyatake, 1965); 15–16 – Paracladiscus choui sp. nov.; 17–18 – P. atricolor Miyatake, 1965. Scale bars: 0.5 mm.

Figs 25–42. Male pygidia (25–30), 8th sternites (31–36) and spicular forks (37–42). 25, 31, 37 – Diplopherusa yonaguniensis sp. nov.; 26, 32, 38 – D. ahsini Yang & Yang. 2013; 27, 33, 39 – D. kitamurai Nakane, 1989; 28, 34, 40 – D. shibatai (Miyatake, 1965); 29, 35, 41 – Paracladiscus choui sp. nov.; 30, 36, 42 – P. atricolor Miyatake, 1965. Scale bars: 0.25 mm (25–28, 30–34, 36–40, 42), 0.5 mm (29, 35, 41).

Fig. 61. Distribution map of Diplopherusa and Paracladiscus species in Japan and Taiwan.