Brooksella alternata
| Brooksella alternata Temporal range:
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|---|---|
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Scientific classification 
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| Kingdom: | Animalia |
| Phylum: | Porifera |
| Class: | Hexactinellida |
| Order: | †Reticulosa |
| Family: | †Protospongiidae |
| Genus: | † |
| Species: | †B. alternata
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| Binomial name | |
| †Brooksella alternata Walcott, 1896
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Brooksella alternata is a species of lobate Cambrian fossil sponge found in the Conasauga Formation of Alabama and Georgia.[1] These fossils are often referred to as "star-cobbles" for their distinct lobate appearance, generally with 6 or more lobes.
Brooksella alternata was first described in 1896 by Charles Walcott, who believed them to be medusoid body fossils of cnidarians.[2][3]
Later researchers have offered other explanations, from diagenetic gas bubbles to burrow traces. The most accepted identity is that they are hexactinellid sponges, based on observed spicules, ostia, and internal structure.[1]
References[]
- ^ a b Ciampaglio, Charles N.; Babcock, Loren E.; Wellman, Carrie L.; York, Angela R.; Brunswick, Holly K. (August 2006). "Phylogenetic affinities and taphonomy of Brooksella from the Cambrian of Georgia and Alabama, USA". Palaeoworld. 15 (3–4): 256–265. doi:10.1016/j.palwor.2006.10.002.
- ^ Walcott, Charles (1896). "Fossil Jelly Fishes from the Middle Cambrian Terrane". Proceedings of the United States National Museum. 18 (1086): 611–614. doi:10.5479/si.00963801.18-1086.611.
- ^ Walcott, Charles (1898). "Fossil Medusae" (PDF). Monographs of the United States Geological Survey. XXX.
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Categories:
- Cambrian animals of North America
- Cambrian sponges
- Fossil taxa described in 1896
- Poriferan stubs