astraeospongia

\\|astrē(ˌ)ōˈspənjēə, -pän-\ noun

Usage: capitalized

Etymology: New Latin, from astraeo- (from Greek astraios starry, from aster-, astēr star) + -spongia — more at star

: a genus of saucer-shaped Silurian fossil sponges having 6-rayed stellate spicules and important as Paleozoic index fossils