Rhopalovalva chidorinoki Nasu, 2021

Nasu, Yoshitsugu, 2021, Description of a new species of the genus Rhopalovalva Kuznetzov (Tortricidae Olethreutinae) from Japan, Zootaxa 4938 (1), pp. 148-150 : 148-150

Rhopalovalva chidorinoki Nasu , sp. nov. ( Figs 1–4 )

[Japanese name: Motoguro-ginzuma-himehamaki]

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Rhopalovalva exartemana: Kawabe 1982: 119 , pl. 25, fig. 43 (adult) (partim); Nasu 2011: 693, pl. 77, fig. 306 (adult, larva, pupa); Nasu 2013: 232, pl. 4–29, fig 41 (adult) (partim). [Misidentification].

Tepes. Holotype: ♂, Mt. Wasamata-yama , Kami-kitayama-mura, Nara Pref., Honshu, JAPAN, 16 vi 1991, at light, Y. Nasu leg., genitalia slide no. YN-1869 . Paratypes: [Honshu, Japan] 1♀, Iwana-dome, Azumi, Matsumoto-shi , Nagano Pref., 2 vii 1956, at light, T. Yasuda leg. 3♀, Simasima-dani, Azumi, Matsumoto-shi , Nagano Pref., em. 22 x 2000, ex Acer carpinifolium (larvae collected on 25 ix 2000), K. Sugisima leg. 1♂ 3♀, Simasima-dani, Azumi, Matsumoto-shi , Nagano Pref., em. 10–12 vi 2001, ex A. carpinifolium (larvae collected on 25 ix 2000), K. Sugisima leg. 1♀, Mt. Wasamata-yama , Kami-kitayama-mura, Nara Pref., 4–5 viii 1992, at light, Y. Nasu leg. 2♀, Mt. Izumi-katsuragi-san, Kishiwada-shi , Osaka Pref., em. 1–7 ii 1995, ex A. carpinifolium (larvae collected on 15 x 1994), Y. Nasu leg. 1♀, Mt. Izumi-katsuragi-san, Kishiwada-shi , Osaka Pref., 16 vi 2001, at light, Y. Nasu leg. , genitalia slide no. YN-1873. 1♀, Mt. Izumi-katsuragi-san, Kishiwada-shi , Osaka Pref., 3 ix 2005, at light, Y. Nasu leg. [ Kyushu , Japan] 1♀, Mt. Hiko-san, Soeda-machi, Tagawagun , Fukuoka Pref., 18 v 1954, at light, H. Kuroko leg.

Diagnosis. Sexual dimorphism is not pronounced. The species has distinct whitish costal strigulae and median fascia. The male genitalia are characterized by a slender uncus lunate in the top, strongly constricted spatulate valva and large wide L-shaped pollex. The female genitalia are characterized by a large funnel-shaped antrum and two large signa. This moth is quietly similar to R. exartemana , but distinguishes by blackish basal patch (in the latter brownish yellow), a slender uncus and lunated apex, larger pollex in the male genitalia and longer antrum in the female genitalia.

Adult ( Fig. 1 ). Male. Wing expanse 11–12 mm (n = 2). Head blackish brown, with pale brownish yellow scale-tufts laterally; antenna simple, dark gray; labial palpus short, whitish, the top of second segment blackish. Thorax blackish brown, and tegula pale brownish yellow. Forewing elongate oblong, apex bent downward, termen sinuate, rounded tornus, without a costal fold. Ground color blackish brown. Apex yellowish brown. Termen blackish brown, with whitish dash below apex. Costa blackish brown, with four pairs of distinct whitish strigulae (costal strigulae) from apex to basal 1/3 of costa. Outward-oblique gray streaks bordered with yellowish brown originating from each pair of the first to third costal strigulae; the first streak connecting to whitish dash of termen below apex; the second and third running to the apical part of the ocelloid patch. Ocelloid patch distinct, indicated by a small oval gray patch, surrounded by yellowish brown. Median fascia distinct, indicated by two whitish bands, originating outward-obliquely from the fourth costal strigulae, bent basally in the end of discal cell, yellowish brown in the apical angle, becoming somewhat brownish, reaching to middle of dorsum. Basal patch blackish brown, with some fragmentary gray streaks, occupying basal 1/3 of wing. Cilia whitish, with a gray basal line. Underside dark brown. Hindwing light grayish brown; cilia whitish, with a dark basal line. Underside light grayish brown.

Female. Wing expanse 10–13 mm (n = 13). Similar to male.

Male genitalia ( Fig. 2 ). Uncus moderately long, slender-club-shaped, lunated apex. Socius slender subtriangle, densely setose. Gnathos weakly sclerotized. Valva spatulate, strongly constricted medially, curved ventrad, with hairy mound on the distal end of sacculus; cucullus clavate-shaped, basally curved, densely setose, apicoventral corner with a large wide L-shaped projection (pollex), smooth rounded apex. Aedeagus sinuated tube-shaped, basal half swollen, tapering to apex, with 8–10 deciduous cornuti.

Female genitalia ( Figs 3, 4 ). Papillae anales flat, densely setose. Apophyses posteriores as long as apophyses anteriores. Seventh sternite sclerotized, with depressed posterior margin, anterior margin with narrow sclerotized strip medially. Ostium bursae circular, situated in the posterior margin of the sternite 7. Ductus bursae long, posterior 1/3 sclerotized, antrum forming a large funnel-shaped, as long as 7th sternite length, evenly tapered to anterior end; ductus seminalis emitted at anterior end of the antrum. Corpus bursae globular, with two large horn-shaped signa, similar in size.

Host plant. Sapindaceae : Acer carpinifolium Siebold et Zucc.

Biological note. Adults attracted to the light were collected in mid June to early September in Honshu. Larvae were collected in late September to mid October in Honshu. The larva spun the leaves of Acer carpinifolium , and cut the host plant margin and folded it over, constructing a pupal case.

Distribution. Japan (Honshu, Kyushu).

Etymology. The specific name is derived from the Japanese name for the host plant “Chidorinoki”.

Remarks. The species have hitherto been regarded as Rhopalovalva exartemana in Japan as in the synonymy.

Razowski (1989) proposed that two characters of male genitalia, a hairy lobe situated at the distal end of the sacculus and a pollex on the cucullus are supposed autapomorphies of the genus Rhopalovalva . However, the latter character is often found in some genera of the tribe Eucosmini , but lacks in some Chinese species, therefore Zhang & Li (2010) recognized the former character as the autapomorphy of the genus. However, in the present species and R. exartemana this character becomes a hairy mound instead of hairy lobe, and may be degenerative state.

Figures

FIGURES 1–4. Rhopalovalva chidorinoki Nasu, sp. nov. 1. Holotype, male. 2. Male genitalia, ventral view, holotype, genitalia slide no. YN-1869. 3. Female genitalia, 7th to 10th segments, ventral view, genitalia slide no. YN-1873. 4. Ditto, signa in corpus bursae.