Orestovia
| Orestovia Temporal range: Lower Devonian–Middle Devonian[1][2] | |
|---|---|
Scientific classification  | |
| Kingdom: | Plantae |
| Phylum: | incertae sedis |
| Family: | †Spongiophytaceae |
| Genus: | Orestovia |
| Species | |
| |
Orestovia is a lower[2]-middle Devonian[1] thallophyte known from fossilised cuticle, cutinite. Described as an enigmatic taxa, Orestovia has variously been categorised as a brown algae, an algae of unknown affinities, a thalloid non-vascular plant, and an early vascular plant, or even the result of the alteration of generations of some other group.[2]
Orestovia are typically found as paper coals. Individual remains are naked, unbranched, cutinised axes up to 20 cm in length and 2 cm wide, tapering distally.[3] Most specimens are preserved as hollow, cuticular sheaths that often exhibit an epidermis-like cellular pattern.[3] The cuticles bear structures which have been described as representing stomata.[4] Spores are sometimes preserved between its layers of cuticle.[2] A reconstruction looks similar to the extant fern Pilularia globulifera (Marsileaceae) in the water with a creeping rhizome and naked, upright axes.[3]
Orestovia remains have been documented from the following locations, In Russia: Pavlovsk, Voronezh Oblast,[2] Graham Bell Island, Arctic Ocean[5] and the Kuznetsk Basin, Siberia.[4] In China: Luquan, Yunnan.[6]
References
- ↑ 1.0 1.1 Snigirevskaya, N.S.; Nadler, Y.S. (1994), "Habitat and Relationships of Orestovia (middle Devonian).", Palaeontographica Abteilung B-Stuttgart- 233: 11–11
- ↑ 2.0 2.1 2.2 2.3 2.4 Krassilov, V. (1981). "Orestovia and the origin of vascular plants". Lethaia 14: 235. doi:10.1111/j.1502-3931.1981.tb01693.x.
- ↑ 3.0 3.1 3.2 Krings, Thomas N. Taylor, Edith L. Taylor, Michael (2009). Paleobotany : the biology and evolution of fossil plants (2nd ed. ed.). Amsterdam: Academic Press. p. 186. ISBN 9780123739728.
- ↑ 4.0 4.1 Gensel, P.G.; Johnson, N.G. (1994), "… the cuticular structure and stomatal organization of Orestovia sp. Cf. O. Petzii from the Kuznetsk …", Palaeontographica Abteilung B-Stuttgart- 233
- ↑ Volkova, I. B.; Bekh-Ivanov, D. E., Sidorova I. N. (2001). "New Find of Cuticular Coal in the Franz Josef Land". Lithology and Mineral Resources 36 (2): 187–190. doi:10.1023/A:1004834703202.
- ↑ Dawei, Sun; Wang Yi, Xu Honghe, Fu Qiang (2007). "Restudy On The Cuticles Of Late Middle Devonian Coal From Luquan, Yunnan, China". Acta Palaeontologica Sinica 46 (3): 355–364. Retrieved 13 April 2012.
External links
- Saint Petersburg State Mining University. Specimen accession with image. http://www.spmi.ru/node/3370 (Russian)
| ||||||||||||||||
