Star sand - Baculogypsina sphaerulata

Japanese: ホシズナ(星砂) - ホシズナ(英語表記)Baculogypsina sphaerulata
Star sand - Baculogypsina sphaerulata
A protozoan of the family Calcarinae in the class Rhizopoda. It is found from Amami Oshima south through tropical regions, where it gathers in groups and attaches to the surface of seaweed and stony coral on the coast. In particular, dead shells are found in large numbers in the sand on the beaches of Taketomi Island in Okinawa, and are sold in small bags as souvenirs. The shell is about 1.5 mm in diameter, slightly bulging in the center, with six spines arranged radially around it. There are many tiny holes on the surface, from which thread-like pseudopodia are extended to attach to other objects and move around.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
根足虫綱カルカリナ科の原生動物。奄美大島以南から熱帯域にかけて分布し,海岸の海藻やイシサンゴなどの表面に群がって付着している。とくに沖縄の竹富島の海岸では砂中に死んだ殻がたくさん混じっており,小さい袋に入れて土産物用に売られている。殻は直径約1.5mmで中央部はやや膨らみ,周囲に6本のとげが放射状に並んでいる。表面にはたくさんの微小な穴が開いていて,ここから糸状の偽足をだして他物に付着したり運動したりする。

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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