Horned stink bug (horned stink bug) - acanthosomatid bug

Japanese: ツノカメムシ(角亀虫) - ツノカメムシ（英語表記）acanthosomatid bug

A general term for insects of the Hemiptera family, Acanthosomatidae. Sometimes considered a subfamily of the Hemiptera family, the two-segmented tarsus has a long spine on the ventral surface of the prothorax that points toward the head, a flat keel on the ventral surface of the mesonothorax, and a sharp projection on the ventral surface of the third abdominal segment, which overlap at the top and bottom. They are herbivorous and are distributed worldwide with about 180 species, and about 25 species in Japan. Known species include Acanthosoma labiduroides , which has a red tail tip that protrudes like a pair of scissors in the male, Sastragala esakii , which has a yellowish-white heart-shaped small scutellum, and Elasmucha putoni, which is small. In the latter two genera, the adults stay still on the egg mass after laying eggs and protect it until they become second-instar nymphs.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

半翅目ツノカメムシ科Acanthosomatidaeの昆虫の総称。カメムシ科の1亜科とされることもあるが，肢の跗節（ふせつ）は2節で前胸腹面に頭部に向かう長いとげがあり，中胸腹面には扁平な竜骨突起，腹部第3節腹面に鋭い突起があり，それぞれが先端や後端で重なる。植食性で世界に分布し約180種，日本には約25種が分布する。雄の尾端は紅色ではさみ状に突出したハサミツノカメムシAcanthosoma labiduroides，小楯板（しようじゆんばん）に黄白色のハート形のあるエサキモンキツノカメムシSastragala esakii，小型なヒメツノカメムシElasmucha putoniなどが知られ，後の2属は産卵後，成虫は卵塊上に静止して2齢若虫になるまでこれを守る。

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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