Journal of the Graduate School of Biosphere Science, Hiroshima University Volume 56
2017-12-15 発行

大島新曽根で採集されたトヨシオマリヒトデ Podosphaeraster toyoshiomaruae の行動観察

An observation of the walking behavior of Podosphaeraster toyoshiomaruae collected from the bank Oshima-shinsone, Kagoshima Prefecture, Japan
Yonetani, Mari
Iida, Ken
Fuji, Taiki
Hirano, Katsushi
Kondo, Yusuke
Kato, Mikio
Hirose, Masato
Fujita, Toshihiko
file
abstract
The podosphaerastrid asteroid Podosphaeraster toyoshiomaruae Fujita and Rowe, 2002 is small-sized, nearly spherical in shape. The species exclusively inhabits on the bank Oshima-shinsone at depths of 100 to 200 m, northwest of Amami-Oshima Island, Kagoshima Prefecture, Japan, where the bottom is entirely covered with sponges, octocorals, and hyrozoan polyps with patches of sandy bottom. The bottom conditions were clearly observed with a ROV on September 29, 2009. A living specimen was collected from this locality on May 21, 2017. During locomotion by tube feet, the body was depressed dorso-ventrally in contrast with the spherical body shape with tube feet unexpanded. The locomotion rate of the specimen was about 1.65 cm/min. Two types of tube feet were identified. Presumably one is for locomotion with a sucker terminally, while the other for sensing.
description
本研究の一部は日本学術振興会科学研究費(基盤研究C,No.16K07825,代表 大塚攻),国立科学博物館総合研究「黒潮に注目した地史・生物史・人類史」によって行われた。
subject
ROV
大島新曽根
管足
トヨシオマリヒトデ
歩行
locomotion
Oshima-shinsone
Podosphaeraster toyoshiomaruae
ROV
tube foot