Tubu shrimp (old shrimp) - Tubu shrimp

Japanese: ムカシエビ(昔蝦) - ムカシエビ

A general term for small crustaceans in the Bathynellacea order of the superorder Protoshrimp (superorder Thraupidae, superorder Acanthopoda). They live in groundwater and freshwater in caves. For this reason, they have no eyes. Their bodies are slender, about 1-2 mm long, and white and translucent. Protoshrimp may look like amphipods at first glance, but their thoracic legs are bibranched and have external limbs for swimming, and some have abdominal limbs and some do not. The telson and the telson form a tail fan, but some have a fork on the telson, showing that they are members of the subclass Malacostraca while still retaining a primitive shape.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

原エビ上目(厚エビ上目，ムカシエビ上目)ムカシエビ目Bathynellaceaの小型甲殻類の総称。地下水や洞穴内の淡水にすんでいる。このため眼をもたない。体は細長く体長1～2mmくらい，白色で半透明。原エビ類は一見，端脚類のように見えるが，原エビ類では胸脚が遊泳用の外肢をもち，二枝型をしており，腹部には腹肢をもつものと，もたないものとがある。尾節は尾肢とともに尾扇をつくるが，尾節に尾叉のあるものもあるなど，軟甲亜綱の一員であることを示すと同時に，原始的な形をとどめている。

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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