Erechthias atririvis ( Meyrick, 1931 )

Erechthias atririvis ( Meyrick, 1931) View in CoL

Figs 5 View Figures 1–8 , 6 View Figures 1–8 , 30 View Figures 27–30 , 38 View Figures 35–38 , 52 Japanese name: kurosuji-tsumaorega View Figure 52

Decadarchis atriviris Meyrick, 1931: 166. Type locality: Japan (Tokyo); Issiki 1950: 443, fig. 1191; Issiki 1957: 15, pl. 2, fig. 52; Okano 1959: 275, pl. 182, fig. 18; Moriuti 1982: pl. 2, figs 23, 24, pl. 237, fig. 1; Park 1983: 56; Azuma and Kinjo 1987: 74; Yoshimatsu and Sakamoto 1991: 99, figs 1–5; Yoshimatsu 1992: 779, figs 1–4, 6, 14.

Erechthais atririvis : Davis 1992: 64; Moriuti and Kadohara 1994: 569; Lee et al. 2020: 625, figs 1 A, 2 A, 3 A; Sakai 2013: 130, fig. 3-12 - 15; Hirowatari and Yagi 2023: 24; Park et al. 2024 b: 1051, fig. 5.

Material examined.

Japan: [Tokyo, Ogasawara Isls.]: [Hahajima Is.]: 1 ♂ 1 ♀, 1–11.V.1977, M. Takakuwa, from Ogsawara Islands, Hahajima Island , rotten Shimayabunikkei, (collected in VII.1976), Yokohama (1 ~ 11.V.1977), genitalia slide no. JP-305 (♂), JP-306 (♀), NMNS .

Diagnosis.

This species is externally similar to whitish Erechthias species, E. itoi , E. acrodina Meyrick, 1912 and E. charadrota but it can be distinguished by the following characteristics: from the base to the basal 1 / 3 of the costal margin is black, but the middle is interrupted by a cream to white spot in the forewing (almost black, but with a narrow white line in E. itoi ; from the base to the basal 1 / 4 cream without black scales in E. acrodina ; completely black in E. charadrota ). The male genitalia are also similar to those of E. itoi , E. acrodina , and E. charadrota , but it can be distinguished by the shape of valva: the shape of the valva is oval, without the basicostal process, and the ventral margin is slightly rounded (the elongate basicostal process is present and the ventral margin curved at apical 1 / 3 in E. itoi , the basicostal process is absent and slightly concaved at ventral margin in E. acrodina , the shape of valva rounded is rectangle and the basicostal process is absent in E. charadrota ). The female genitalia are also similar to those of E. itoi , but it can be distinguished by the shape of signum: the signum is small, simple knob-shaped, and with no additional lobes (the signum is absent in E. itoi ).

Additional description.

Measurements. Forewing length 6.8 mm in male, 8.1 mm in female, antenna length 4.8 mm in male, 5.0 mm in female in Ogasawara Islands. Wingspan 13 mm in male in original description.

Distribution.

Japan (Honshu, Shikoku, Kyushu, Tsushima Is., Hahajima Is., Okinawajima Is., Ishigakijima Is., Iriomotejima Is., Yonagunijima Is.), Taiwan, and South Korea ( Sakai 2013; Lee et al. 2020; Park et al. 2024 b).

Biology.

Larvae bore under the rotten bark and feed on the cambium. Adults were collected in June and July in Honshu and from May to July on Ishigaki Island ( Sakai 2013). On the Ogasawara Islands, two adults emerged from rotten wood (see remarks) in May.

DNA analyses.

DNA barcodes were not generated.

Remarks.

Since there is no plant called “ Shima-yabunikkei, ” as was labeled by M. Takakuwa, it is assumed that the name refers to the Cinnamomum pseudopedunculatum Hayata (Ogasawara-yabunikkei). This species was not collected during the study period (2022–2024).