Umigumo (sea spider) - Umigumo (English spelling) sea spider

Japanese: ウミグモ(海蜘蛛) - ウミグモ（英語表記）sea spider

Also known as dream bugs, this is a general term for marine arthropods in the Pycnogonida class, which have spider-like bodies. They have similarities to both crustaceans and spiders, and were once classified as part of the Arachnid class. They are 0.1 to several centimeters long, and are divided into three parts: the head, thorax, and abdomen. The head is small and fused with the first thoracic segment, with a tubular snout at the front end and a mouth at the tip. Near the base of the snout are chelicerae and palps, and males always have oviparous legs.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

ユメムシ(夢虫)とも呼ばれ，体がクモに似た海産のウミグモ綱Pycnogonidaに属する節足動物の総称。甲殻類にも，クモ類にも似たところがあり，古くは蛛形（ちゆけい）綱の一部として分類されたこともあった。体長0.1～数cm，体は頭，胸，腹の3部に分かれる。頭部は小さく，第1胸節と融合し，前端に筒状の吻（ふん）をもち，その先端に口がある。吻の基部近くには鋏角（きようかく），触肢のほか，雄には必ず担卵脚がある。

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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