Biology:Oikozetetes
Oikozetetes[1] is a genus of halkeriid known only from two types of cap-shaped shell found in the Burgess Shale and dated to about 505 million years ago. The two types are thought to be front and rear shells.[2] They were probably calcareous while the organism was alive (although diagenesis sometimes replaces the original mineral with another, such as silica).[3] It is thought to also have borne an armour coat consisting of biomineralised sclerites, like Halkieria. These are never found in direct association with the shells, but there are many biostratinomic processes which could account for this fact.[3]
The lower Cambrian taxon Ocruranus (=Eohalobia) is putatively equivalent to the shells of Oikozetetes[3] and seemingly belonged to a halkieriid-type body,[4] although an intermediate valve suggests a Palaeoloricate-like body form.[5]
References
- ↑ "Oikozetetes seilacheri". Burgess Shale Fossil Gallery. Virtual Museum of Canada. 2011. http://burgess-shale.rom.on.ca/en/fossil-gallery/view-species.php?id=92.
- ↑ Conway Morris, S. (1994). "Enigmatic shells, possibly halkieriid, from the Middle Cambrian Burgess Shale, British Columbia". Neues Jahrbuch für Geologie und Paläontologie 195 (1–3): 319–331. doi:10.1127/njgpa/195/1995/319. Bibcode: 1995NJGPA.195..319C.
- ↑ 3.0 3.1 3.2 Paterson, J. R.; Brock, G. A.; Skovsted, C. B. (2009). "Oikozetetes from the early Cambrian of South Australia: implications for halkieriid affinities and functional morphology". Lethaia 42 (2): 199–203. doi:10.1111/j.1502-3931.2008.00132.x. Bibcode: 2009Letha..42..199P.
- ↑ Siegmund, H. (2007). "The Ocruranus-Eohalobia group of small shelly fossils from the Lower Cambrian of Yunnan". Lethaia 30 (4): 285–291. doi:10.1111/j.1502-3931.1997.tb00470.x.
- ↑ Vendrasco, M. J.; Li, G.; Porter, S. M.; Fernandez, C. Z. (2009). "New data on the enigmatic Ocruranus–Eohalobia group of Early Cambrian small skeletal fossils". Palaeontology 52 (6): 1373–1396. doi:10.1111/j.1475-4983.2009.00913.x. Bibcode: 2009Palgy..52.1373V.
Wikidata ☰ Q135457937 entry
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