Yamamayu (mountain cocoon) - Yamamayu (English spelling) Antheraea yamamai

Japanese: ヤママユ(山繭) - ヤママユ（英語表記）Antheraea yamamai

A large moth of the Lepidoptera family, Saturniidae, also known as Tensan (heavenly silkworm). Native to Japan, it is distributed throughout the country. Adults are about 35 mm long, with forewings spread about 130 mm, and are grayish-yellow-brown to dark purple-brown in color. They have eye-shaped patterns in the center of the front and back wings. The eggs are flattened and spherical, about 2 mm in diameter, with hard white eggshells, but the appearance is blackish-brown due to the color of the agglutinating substance. The larvae are green, with brown heads up to the second instar, which gradually turn green from the third instar onwards. The body shape is similar to that of the Sakusan, with three pairs of hair tufts on each body segment.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

鱗翅（りんし）目ヤママユガ科の大型のガで，テンサン(天蚕)とも呼ばれる。日本原産で全国各地に分布している。成虫は体長約35mm，前翅の開張130mm前後で，灰黄褐色から暗紫褐色を呈する。前後の翅の中央に眼状紋(目玉模様)をもつ。卵は直径2mm前後の扁平な球状で硬い白色の卵殻をもつが，膠着（こうちやく）物質の色により外観は黒褐色を呈する。幼虫は緑色で頭部は2齢までが褐色，3齢以降しだいに緑色となる。体形はサクサンに類似し，各体節に3対の毛叢（もうそう）突起を有する。

出典　株式会社平凡社世界大百科事典第２版について　情報

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