Argyresthia ( Argyresthia ) angusta Moriuti, 1969

Lee, Ga-Eun, Lee, Yeong-Don & Liu, Tengteng, 2023, A new species and two new records of Argyresthia Hübner, [1825] (Lepidoptera: Argyresthiidae) from Hallasan National Park of Korea, Zootaxa 5315 (3), pp. 282-290 : 286

Argyresthia ( Argyresthia) angusta Moriuti, 1969

Korean name: jop-eun-nal-gae-gwang-taek-jip-na-bang

( Figs 12–16 )

Argyresthia angusta Moriuti, 1969: 12 ; Moriuti, 1977: 265; Moriuti, 1982: 223; Yamauchi & Hirowatari, 2013: 165; Liu et al., 2017: 62 . Type locality: Kyushu, Japan. Type depository: Osaka Metropolitan University (formerly Osaka Prefecture University).

Material examined. KOREA, Jeju-do, 1 ♁, Seogwipo-si, Haean-dong, Hallasan National Park , Eorimok , 975 m, 18.VI.2022, leg. Ga-Eun Lee, genitalia slide no. LGE22115 ( JNU), DNA voucher no. LGE-G727 ( JNU) .

Diagnosis. Forewing span 9.5 mm (n=1) ( Fig. 12 ). The forewing color and pattern of A. ( A.) angusta are most similar to those of A. ( A.) lanosa Liu, Wang et Li, 2017 and A. ( A.) surrecta Liu, Wang et Li, 2017 distributed in China, and they can be separated by the characteristics of the male genitalia. Argyresthia ( A.) angusta has valvae without dense setae on the ventral margin and a strongly curved phallus, whereas A. ( A.) lanosa has dense short setae along its ventral margin and A. ( A.) surrecta has a nearly straight phallus.

Variation. The socius of the type specimen has 7 scale-like setae ( Moriuti 1969, described as specialized scales), but the Korean specimen bears only five. Although Moriuti (1969) used the number of scale-like setae as one of the characteristics separating A. ( A.) angusta from a related species A. icterias , it can vary within a species of Argyresthia : 5–10 setae in A. ( A.) lanosa and 8–11 in A. ( A.) surrecta ( Liu et al. 2017) .

Distribution. Korea (new record), China, Japan.

GenBank accession number. OQ857837.

DNA analysis. The sequences of two closely related species, A. ( A.) lanosa (accession nos KY570298– KY570300) and A. ( A.) surrecta (accession nos KY570301, KY570302), were extracted from GenBank. The interspecific variation between A. ( A.) angusta and A. ( A.) lanosa was very low, ranging from 1.7% to 2.0%, and that between A. ( A.) angusta and A. ( A.) surrecta was 2.4% ( Table 1 ).

Remarks. For the descriptions of adults and female genitalia, see Moriuti 1969: 12, 13. The female genitalia are illustrated in Moriuti 1969 (Figs 50, 75) and Liu et al. 2017 (Fig. 287), and the wing venation of a male ( holotype) is given in Moriuti 1969 ( Fig. 22 ).

Figures

FIGURES 12–16. Argyresthia (Argyresthia) angusta Moriuti. 12, adult, male; 13, head in lateral view; 14, male abdominal segment VIII, slide no. LGE22115; 15, male genitalia, ditto; 16, phallus, ditto (Scale bars: 0.2 mm except fig. 12 = 2.0 mm).

FIGURES 17–22. Argyresthia (Blastotere) densa Liu, Wang et Li. 17, adult, female; 18, head in lateral view; 19, male abdominal segment VIII, slide no. LGE23003; 20, male genitalia with sternite VIII attached, ditto; 21, phallus, ditto; 22, female genitalia, slide no. LGE23001 (Scale bars: 0.2 mm except fig. 17 = 2.0 mm).