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2017年1月12日木曜日

Record of Cardiapoda richardi from Kume Island


Cardiapoda known only two species from worldwide.
  • Cardiapoda richardi Vayssiere, 1903
  • Cardiapoda placenta  (Lesson, 1830)

Cardiapoda richardi

C. richardi is smaller species than C. placenta.; the tail is long like a filamentous; gill handle is shorter than C. placenta. ; gill number is eight; shell is not characterized at old literature but, actually they has a very thin shell. Retractable brown, membranous structure on the mid ventral surface of the tail. Lens of eye rests in a surrounded in a U-shaped retina. Japanese name is "Muchio-Zoukurage". "Muchio" mean tail shapes filamentous. "Zou" mean an elephant. "Kurage" mean a jellyfish.

About this individual

These pictures all took at Kume-Island Okinawa Japan. Size: about 35mm. This individual is female. Because egg strings is releasing from near the gill and Cardiapoda is known that fin sucker present only in males. Body is covered with many reddish pigment. There was a behavior to round the body. This is considered to be for defense. Brown membrane appeared only at that time. In normal posture the brown membrane is stored in the ventral surface of tail.

Cardiapoda richardi ムチオゾウクラゲ
Egg strings is releasing from near the gill

Cardiapoda richardi ムチオゾウクラゲ
Gill number is eight they has a very thin shell

Cardiapoda richardi ムチオゾウクラゲ
Lens of eye rests in a surrounded in a U-shaped retina.

Cardiapoda richardi ムチオゾウクラゲ
Retractable brown, membranous structure on the mid ventral surface of the tail.

Cardiapoda richardi ムチオゾウクラゲ
normal posture, brown membrane is stored in the ventral surface of tail.

<<References>>

Cardiapoda richardi - Tree of Life Web Project 

Chihara, M. & Murano, M. eds. ,1997 An Illustrated Guide to Marine Plankton in Japan.  Description: xxxvi, 1574pp, Tokai University Press, Tokyo Japan. (in Japanese)

Ryo Minemizu et al ,2015 A Photographic Guide to the Jellyfishes of Japan. 360pp. Heibonsha, Tokyo Japan. (in Japanese)