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Rhabdamia novaluna 2018. Yoshida, Mabuchi and Motomura

Yoshida, T., K. Mabuchi and H. Motomura. 2018 (Oct.). Rhabdamia novaluna, a new species of cardinalfish (Perciformes: Apogonidae) from the western Pacific Ocean, with comments on the synonymy of Rhabdamia gracilis. Ichthyological Research, doi: 10.1007/s10228-018-0664-1 (26 Oct. 2018)

https://link.springer.com/article/10.1007%2Fs10228-018-0664-1

This thing is very amazing. It is about 50-60mm and looks complety transparent sliding smoothly on the sand. When it is disturbed, it turn into a white "ghost" form of about 15-20mm like the picture shown and become motionless.

Reference :
https://zhidao.baidu.com/question/447686831.html

Notes : Cynthia Yau @ hkwildlife - tongue-like proboscis of an innkeeper worm, 絳體管口虫益 (Ochetostoma erythrogrammon).