Arimasia fossil map
Where fossils of Arimasia have been found, shown on the Earth as it looked about 555 million years ago and on today’s map.
Dots are fossil collections recorded in the Paleobiology Database. The “then” view moves today’s fossil sites back to their positions 555 million years ago (the time slice nearest the median age of the fossils) using the Merdith et al. (2021) plate model; positions are approximate. Open on the timeline map →
| Group | Ediacaran & Cambrian life |
|---|---|
| Lived | 635–538.8 million years ago (Ediacaran) |
| Periods | Ediacaran |
| Named by | Runnegar et al. 2024 |
| Fossil records | 2 occurrences at 2 locations (PBDB) |
| Found in | Namibia |
| Rock formations | Urusis |
About Arimasia
Arimasia germsi is an extinct sponge from the late Ediacaran, with possible affinities to the Archaeocyatha. Estimated to be about 543 million years old, A. germsi has been identified as possibly being the oldest known archaeocyathan to date. Its fossil material was found between 1993 and 1996 from the Nama Group in Namibia.
Text in “About” is quoted from the Wikipedia article Arimasia (revision 1346131085), licensed under CC BY-SA 4.0; introduction excerpted verbatim, formatting removed. Ages, family, authority and fossil records: Paleobiology Database, accessed 23 October 2026. Ages are those of the rock layers the fossils were found in. Wikidata: Q131752647.
