Tentaculites
| Tentaculites Temporal range:
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|---|---|
| File:TentaculitidDevonian.jpg | |
| Tentaculitids from the Devonian of Maryland. | |
Scientific classification 
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| Kingdom: | Animalia |
| Class: | †Tentaculita |
| Order: | †Tentaculitida |
| Family: | †Tentaculitidae |
| Genus: | †Tentaculites von Schlotheim, 1820 |
| Species | |
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Tentaculites is an extinct genus of conical fossils of uncertain affinity, class Tentaculita, although it is not the only member of the class. It is known from Lower Ordovician to Upper Devonian deposits[1] both as calcitic shells with a brachiopod-like microstructure[2] and carbonaceous 'linings'.[3][4] The "tentaculites" (i.e. tentaculita) are also referred to as the styliolinids.
Affinity
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The taxonomic classification of tentaculitids is uncertain. Some grouped them with pteropods, but there is no modern support and only superficial similarity.[who?][5] They may also be related to other conical shells of uncertain affinity including cornulitids, Anticalyptraea, microconchids and trypanoporids.[6] Their shell microstructure has warranted their comparison with the brachiopods and phoronids,[2][7] and the possible Ediacaran lophophorate Namacalathus.[8]
Morphology
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Tentaculitids have ribbed, cone-shaped shells which range in length from 5 to 20 mm. Some species septate; their embryonic shell, which is retained, forms a small, sometimes spherical, chamber.[4]
Ecology
[edit | edit source]Some species are inferred to have been planktonic.[9]
See also
[edit | edit source]- Mari Mari Group, fossil formation in the state of Amazonas of northwestern Brazil
References
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- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Wood, G.D., Miller, M.A., and Bergstrom, S.M. 2004. Late Devonian (Frasnian) tentaculite organic remains in palynological preparations, Radom−Lublin region, Poland. Memoirs of the Association of Australian Palaeontologists 29: 253–258.
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Ager, 1963, Principles of Palaeontology
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- ^ 1. Zhuravlev, A.Y., Wood, R.A., and Penny, A.M. (2015). Ediacaran skeletal metazoan interpreted as a lophophorate. Proc. R. Soc. B 282, 20151860. Available at: http://rspb.royalsocietypublishing.org/lookup/doi/10.1098/rspb.2015.1860.
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Further reading
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- Treatise on Invertebrate Paleontology, Part W - Miscellanea. Geological Society of America and University of Kansas Press, 1962. LCCN 53012913
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- Devonian animals
- Late Devonian animals
- Tentaculita
- Early Ordovician first appearances
- Late Devonian genus extinctions
- Silurian animals of North America
- Paleozoic life of Ontario
- Paleozoic life of Alberta
- Paleozoic life of the Northwest Territories
- Paleozoic life of Nova Scotia
- Paleozoic life of Quebec
- Paleozoic life of Yukon