Biology:Hiemalora
Hiemalora is a fossil of the Ediacaran biota, reaching around 3 cm in diameter, which superficially resembles a sea anemone. The genus has a sack-like body with faint radiating lines originally interpreted as tentacles, but discovery of a frond-like structure seemingly attached to some Heimalora has added weight to a competing interpretation: that it represents the holdfast of a larger organism.[1]
In 2020, a new study was published that described nine different specimens from the Indreelva member, Digermulen Peninsula, Finnmark (Arctic Norway).[2] The specimens described in the paper have high degrees of variation between morphologies and within the specimens that are thought to be of the same species. Some of the representative fossils from that paper either show multiple Aspidella-like structures on the same specimen, or a Primocandelabrum-like cone visible in one of the fossils.[2] All of the examples of fossils in the publication were determined to most likely represent the species Hiemalora stellaris, however, one of the more poorly preserved specimens (D18-50) is thought to have been representative of Hiemalora pleiomorphus, although the latter of the species represented by the specimens does not show parallel ridges running along the poorly preserved central disc.[2] A representative of H, stellaris might have represented a holdfast with a Primocandelabrum frond attached to it, which may further support the theory of Hiemalora being a holdfast for Primocandelabrum.[2]
This interpretation would stand against its original classification in the medusoid Cnidaria; it would also consign a once-popular hypothesis placing Hiemalora in the chondrophores,[3]
Hiemalora has been identified in a wide range of facies and locations globally.[4][1][5][6]
Etymology
The genus was originally named Pinegia,[7] but was renamed two years later when it was realised that a genus of Permian insect already bore the name. [8][9] The revised name comes from Latin hiemalis ora, "winter coast".
See also
References
- ↑ 1.0 1.1 Hofmann, H.J. (2005). "HIEMALORA AND OTHER EDIACARAN FOSSILS OF NORTHEASTERN NEWFOUNDLAND, AND CORRELATIONS WITHIN AVALONIA". Geological Society of America Abstracts with Programs 37 (7): 485. http://gsa.confex.com/gsa/2005AM/finalprogram/abstract_94964.htm. Retrieved 2007-08-20.
- ↑ 2.0 2.1 2.2 2.3 Nicholas, Hodby (March 2020). The Enigmatic Fossil Hiemalora in the Ediacaran of the Digermulan Peninsula (Thesis).
- ↑ Narbonne, G.M.; Buatois, L.A.; Gabriela Mangano, M. (1994). "New Ediacaran Fossils from the Mackenzie Mountains, Northwestern Canada". Journal of Paleontology 68 (3): 411–416. doi:10.1017/S0022336000025816. Bibcode: 1994JPal...68..411N.
- ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedbook1 - ↑ Waggoner, B. (1998). "The Ediacaran Biotas in Space and Time". Integrative and Comparative Biology 43 (1): 104–113. doi:10.1093/icb/43.1.104. PMID 21680415.
- ↑ Parihar, V.S.; Hukmaram; Kumar, Pawan; Khichi, C.P.; Harsh, Anshul (2021-11-01). "Hiemalora stellaris from Ediacaran Sonia Sandstone of Jodhpur Group of Marwar Supergroup, Western Rajasthan, India" (in en). Journal of the Geological Society of India 97 (11): 1447–1453. doi:10.1007/s12594-021-1885-x. ISSN 0974-6889. https://pubs.geoscienceworld.org/jour-geosocindia/article/97/11/1447/632304/Hiemalora-stellaris-from-Ediacaran-Sonia-Sandstone.
- ↑ Fedonkin, M.A. (1980). "New representatives of the Precambrian coelenterates in the northern Russian platform" (in ru). Paleontologicheskii Zhurnal 2: 7–15.
- ↑ Fedonkin, M.A. (1982). "New generic name for the Precambrian coelenterates" (in ru). Paleontologicheskii Zhurnal 2: 137.
- ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedNarbonne1994
External links
Wikidata ☰ Q1627163 entry
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