SINCE 1828
Astraeospongia
noun
As·traeo·spon·gia
| \¦astrē(ˌ)ōˈspənjēə, -pän-\
Definition of Astraeospongia
: a genus of saucer-shaped Silurian fossil sponges having 6-rayed stellate spicules and important as Paleozoic index fossils
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