Dynoides dentisinus (English spelling) Dynoidesdentisinus

Japanese: Dynoides dentisinus（英語表記）Dynoidesdentisinus

…They cling to other objects with their flattened bodies, but are also very skilled swimmers, swimming on their backs. There are many species in the family Sphaeridae, and some, such as Gnorimosphaeroma oregonensis and Dynoides dentisinus, are often found under stones near the shoreline, while others, such as Cymodoce japonica and Holotelson tuberculatus , are often found in seaweed, but some are free-living. Sphaeroma retrolaevis can bore into wood underwater, while S. sieboldii can bore into tuff as well as wood. …

*Some of the terminology that mentions "Dynoides dentisinus" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…扁平な体を他の物に密着させてはうが，泳ぐのも非常に達者で，背を下にして泳ぐ。コツブムシ科には種類が多く，イソコツブムシGnorimosphaeroma oregonensis，シリケンウミセミDynoides dentisinusなどは汀線（ていせん）付近の石の下に，ニホンコツブムシCymodoce japonica，チビウミセミHolotelson tuberculatusなどは海藻中によく見られるが，なかには自由生活もしている。ヨツバコツブムシSphaeroma retrolaevisは水中の木材に，ナナツバコツブムシS.sieboldiiでは木材のほかに凝灰岩にまで穿孔（せんこう）する。…