noun
hexactinellid sponge; glass sponge
Scientific term for sponges of the class Hexactinellida, characterized by siliceous spicules. Used in biology and marine science contexts.
六放海綿は深海に生息するガラス質の骨格を持つ海綿動物です。
Hexactinellid sponges are marine sponges with glassy skeletons that live in the deep sea.
六放 (six-rayed) + 海綿 (sponge), referring to the six-rayed siliceous spicules characteristic of this sponge class.