Tsu Freshwater Medusa (Craspedacusta iseana)

This species of freshwater medusa is known from three specimens that were collected in 1921 in a spring in the city of Tsu in the Mie Prefecture on the island of Honshu, Japan.

The species was closely related to the widespread Sowerbi’s Freshwater Medusa (Craspedacusta sowerbiiLankester) (see photo below) but differed from that species by its smaller umbrella and in having less tentacles.

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References:

[1] Cheryl Lewis; Masao Migita; Hiroshi Hashimoto; Allen G. Collins: On the occurrence of freshwater jellyfish in Japan 1928-2011: eighty-three years of records of mamizu kurage (Limnomedusae, Olindiidae). Proceedings of the Biological Society of Washington 125(2): 165-179. 2012

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edited: 05.02.2024