The oldest putative calcarean genus is Gravestockia, from the "Atdabanian" (Cambrian Stage 3) of Australia. [4] Calcareans are probably descended from "heteractinid" sponges, which first …

2024年6月16日 · Some are composed of silica spicules, and others of calcium carbonate. They generally do not have body symmetry, but some sponges have radial symmetry. Their bodies …

Astraeospongium is a genus of calcareous sponge from the Silurian. [1][4] Known species include A. meniscum and A. patina. The type species of Astraeospongium, A. meniscum, was named …

A list of the names of genera and subgenera in zoology from the tenth edition of Linnaeus, 1758 to the end of 2004. Digitised by uBio from vols. 1-9 of Neave (ed.), 1939-1996 plus …

Specimen: UMMP IP 15299 Taxon: Astraeospongia meniscus Element: Classification Kingdom: Animalia Phylum: Porifera Class: Hyalospongea Order: Heteractinida Family: …

2023年9月11日 · The pages listed here contain information on each taxa listed on the 2024 National Fossil List. Fossils with an asterisk (*) are only to be used for state and national tests. …

Science Olympiad Fossil Event The 2016 Science Olympiad Fossil List includes the two genera under the Sponges (Phylum Porifera) category: Hydnoceras (class Hexactinellida) and …

The meaning of ASTRAEOSPONGIA is a genus of saucer-shaped Silurian fossil sponges having 6-rayed stellate spicules and important as Paleozoic index fossils.

3. # 2004 Astraeospongia. Another Paleozoic calcareous sponge. Find a star-shaped spicule. The Sponge was a dish-shaped mass of organic material around these spicules.

Astraeospongia meniscus is a species included in phylum Porifera, class hexactinellida, order hexasterosphora, family astreospongiidae. Like other species in the same class, …