Janospira

Janospira; Temporal range: Ordovician PreꞒ Ꞓ O S D C P T J K Pg N
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 foraminiferan or molluscan affinity, though, some researchers presume it to be an archaeogastropod.

Species of Janospira are known from northern Spitsbergen, Norway, and from Australia

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. 11 (1): 80. doi:10.1111/j.1502-3931.1978.tb01220.x.
↑ Paterson, John R. (2001). "First occurrence of Janospira from the Early Ordovician of Australia". Alcheringa: An Australasian Journal of Palaeontology. 25: 129–130. doi:10.1080/03115510108619218. S2CID 129236604.

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[Fortrey1976-1] 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_1977-2] Yochelson, ELLIS L. (1977). "Comments on Janospira". Lethaia. 10 (3): 204. doi:10.1111/j.1502-3931.1977.tb00612.x.

[3] POKORNý, VLADIMÍR (January 1978). "Janospira, a presumed archaeogastropod". Lethaia. 11 (1): 80. doi:10.1111/j.1502-3931.1978.tb01220.x.

[4] Paterson, John R. (2001). "First occurrence of Janospira from the Early Ordovician of Australia". Alcheringa: An Australasian Journal of Palaeontology. 25: 129–130. doi:10.1080/03115510108619218. S2CID 129236604.