Corythoxestis yaeyamensis ( Kumata, 1998 )

Kobayashi, Shigeki, Huang, Guo-Hua, Nakamura, Akihiro & Hirowatari, Toshiya, 2013, Four new species of Gracillariidae (Lepidoptera) from China and Japan, and description of the pupal morphology of the genera Corythoxestis, Eumetriochroa, Guttigera, and Metriochroa, Zootaxa 3619 (2), pp. 101-129 : 122-123

Corythoxestis yaeyamensis ( Kumata, 1998)

Figs. 2 L, 20.

Cryphiomystis yaeyamensis Kumata, 1998: 109 –110, figs 11, 13(G, H), 15(D), 27(C, D). Type locality: Japan (Okinawa).

Pupa. ( Fig. 13 J, 20). Creamy yellow to darker yellow, 2.7 mm in length, 0.5 mm in diameter. Vertex with a triangular, laciniate, small frontal process (cocoon cutter) flanked by a pair of spatulate processes with a hair on inner apex ( Fig. 20 B, E). Dorsum of A2–A10 with a pair of thick setae, and with a concentration of small spines in patches; A3–A9 with two pairs of long, lateral setae ( Fig. 20 F, H, I). A10 with a pair of flat, digitiform, slightly curved processes projecting from lateral side ( Fig. 20 J, M); another pair of laterally curved, uncinate processes from dorsal side of lateral ones ( Fig. 20 O); a pair of short setae, as long as dorsal process from anterodorsal side of lateral ones ( Fig. 20 L, O).

Distribution. Japan (Okinawa (Iriomote Is. ( Kumata 1998), Ishigaki Is.).

Host plant. Saurauia tristyla DC. in Japan, Actinidiaceae ( Kumata 1998) .

Specimens examined. 7exs.

Adults: Japan: 7 exs, Maesato, Ishigaki Is., Okinawa, 13–17.v.2012 em., S. Kobayashi, K. Nakatsuka, T. Yoshida & T. Hirowatari leg. Host: Saurauia tristyla , 8.v.2012 (pupa & larva).

Pupae: 5 exs, Maesato, Ishigaki Is., Okinawa, 19.v.2012., S. Kobayashi, K. Nakatsuka, T. Yoshida & T. Hirowatari, 8, 11.v.2012 (pupa) in OPU.

Biology. Kumata (1998) recorded the biology of this species. In the present study, we newly recorded the length and/or width of the mine, larva, and cocoon fold. We observed the larvae on Saurauia tristyla forming a long serpentine mine on the adaxial epidermis; about 70~ cm in length, 0.3–1.2~ mm in width. The mines ( Fig. 13 A–E) are usually found at a density of 1–6 mines per leaf. The larva is 2.7–6.0 mm long and yellow in coloration ( Fig. 13 G). The final instar larva is 3.3~ mm long and yellow in coloration ( Fig. 13 H). A pupal cocoon fold (whitish and blackish in the middle, 6.5–7.0 mm in length, 1.2–2.0 mm in width) is situated at the end of the mine ( Fig. 13 I).

Figures

FIGURE 2. Adult of Oecophyllembiinae species from China and Japan. A. Metriochroa symplocosella sp. nov., holotype 3. B. Paratype ♀. C. Guttigera schefflerella sp. nov., holotype 3. D. Paratype ♀. E. Eumetriochroa araliella sp. nov., holotype 3. F. Paratype ♀ mining Evodiopanax innovans. G. Paratype 3 mining Dendropanax trifidus. H. Paratype 3 mining Fatsia japonica. I. Corythoxestis tricalysiella sp. nov., holotype 3. J. Paratype ♀. K. Corythoxestis sunosei (Kumata, 1998) 3 in Japan. L. Corythoxestis yaeyamensis (Kumata, 1998).

FIGURE 13. Biology of Corythoxestis yaeyamensis (Kumata, 1998) on the adaxial epidermis of the leaves of hostplant, Saurauia tristyla. A, B. biology of the imature stages on the leaf. C. The shoot of the hostplant and leaf mines. D. Mine by young larva. E. Mine by later instar larva. F, I. Cocoon fold. G. Later instar larva. H. Final instar larva. J. Pupa on the cocoon. K. Resting posture of the adult.

FIGURE 20. Pupa of Corythoxestis yaeyamensis (Kumata, 1998). A. Head, ventral view. B. Cocoon cutter, ventral view. C. Frons. D. Head, lateral view. E. Cocoon cutter, lateral view. F. Spines on 6 th abdominal tergum, lateral view. G. Head, dorsal view. H. Spines on 6 th abdominal tergum, dorsal view. I. Spines on 6 – 7 th abdominal tergum, lateradorsal view. J. A 7 – A 10, ventral view. K. Lateral view. L. A 10, lateral view. M. A 7 – A 10, dorsal view. N. A 10, dorsal view. O. Caudal processes on A 10. cp: caudal process of cremaster; dp: dorsal process of cremaster. ds: dorsal seta; sds: subdorsal seta; ls: lateral seta.