Otavia
| Otavia antiqua | |
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| Fossil | |
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| 3D Reconstruction of Otavia antiqua | |
| Scientific classification | |
| Kingdom: | |
| Phylum: | |
| Genus: | †Otavia (Brain et al., 2012)
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| Species: | †Otavia antiqua
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| Binomial name | |
| †Otavia antiqua (Brain et al., 2012)
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Otavia antiqua is an ancient sponge-like multicellular organism found in the Otavi Group (the generic name being the namesake) in the Etosha National Park, Namibia. It is claimed to be the oldest animal fossil, being found in rock aged between 760 and 550 million years ago. The oldest Otavia fossils are from the Tonian period, before the Cryogenian glaciations, but the latest found were from the Nama Group rocks of the Ediacaran period.[1]
The shape of Otavia fossils is irregular but rounded, and the size varies from one-third of a millimetre to 5 millimetres (0.20 in). They are hollow inside, and have many small, osculum-like holes connecting the interior to the outside, similar in body plan to most poriferans. The material of the outer wall is predominantly calcium phosphate.[1]
The affinities of these fossils, along with other paleontological evidence for Precambrian sponges, are disputed.[2]
See also
[edit]References
[edit]- ^ a b C. K. 'Bob' Brain; Anthony R. Prave; Karl-Heinz Hoffmann; Anthony E. Fallick; Andre Botha; Donald A. Herd; Craig Sturrock; Iain Young; Daniel J. Condon; Stuart G. Allison (2012). "The first animals: ca. 760-million-year-old sponge-like fossils from Namibia". South African Journal of Science. 108 (1/2). doi:10.4102/sajs.v108i1/2.658. hdl:2263/18222.
- ^ Antcliffe, Jonathan B.; Callow, Richard H. T.; Brasier, Martin D. (November 2014). "Giving the early fossil record of sponges a squeeze". Biological Reviews. 89 (4): 972–1004. doi:10.1111/brv.12090. PMID 24779547. S2CID 22630754.
Further reading
[edit]- Robert W. Gess (2012). "The oldest animal fossils". South African Journal of Science. 108 (1/2). doi:10.4102/sajs.v108i1/2.1064. ISSN 1996-7489.
- "Namibia sponge fossils are world's first animals: study". PhysOrg.com. 6 February 2012.
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