Janospira
| Janospira Temporal range: Ordovician[1] | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | incertae sedis |
| Genus: | †Janospira |
Janospira is a microfossil known from Ordovician deposits, whose affinity is uncertain. It resembles a spiral shell mounted on a cylinder, probably calcareous, about 1 mm in length. There are compelling reasons to discount a foramaniferan or molluscan affinity,[1][2] though, some researchers presume it to be an archaeogastropod.[3]
Species of Janospira are known from northern Spitsbergen, Norway,[1] and from Australia[4]
References
- 1 2 3 Fortey, RICHARD A.; Whittaker, John E. (1976). "Janospira - an Ordovician microfossil in search of a Phylum". Lethaia. 9 (4): 397. doi:10.1111/j.1502-3931.1976.tb00980.x.
- ↑ Yochelson, ELLIS L. (1977). "Comments on Janospira". Lethaia. 10 (3): 204. doi:10.1111/j.1502-3931.1977.tb00612.x.
- ↑ POKORNý, VLADIMÍR (January 1978). "Janospira, a presumed archaeogastropod". Lethaia Volume 11, Issue 1, page 80. doi:10.1111/j.1502-3931.1978.tb01220.x. Retrieved 4 July 2016.
- ↑ Paterson, John R. (2001). "First occurrence of Janospira from the Early Ordovician of Australia". Alcheringa: An Australasian Journal of Palaeontology Volume 25, Issue 1. doi:10.1080/03115510108619218.
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