noun
rotifer
Scientific term for microscopic aquatic animals of the phylum Rotifera, often studied in biology and ecology.
輪形動物は淡水のプランクトンとしてよく見られる。
Rotifers are commonly found as freshwater plankton.
From 輪形 (ring-shaped) + 動物 (animal), referring to the characteristic ciliated corona that resembles a rotating wheel.