| Anabarella Temporal range:
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | †Helcionelloida |
| Order: | †Helcionelliformes |
| Family: | †Helcionellidae |
| Genus: | †Anabarella |
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Anabarella is a species of bilaterally-flattened monoplacophoran mollusc,[2] with a morphological similarity to the rostroconchs.[3] Its shell preserves evidence of three mineralogical textures on its outer surface: it is polygonal near the crest of the shell, subsequently changing to both spiny and stepwise.[3] Its internal microstructure is calcitic and semi-nacreous.[4] Its name reflects its provenance from Anabar, Siberia.[3] It has been interpreted as ancestral to the rostroconchs,[5] and has been aligned to the Helcionellidae.[2]
The genus is closely related to Watsonella, with which it bears many morphological similarities,[3] including a laminar internal shell microstructure said to connect it with the early bivalves Fordilla and Pojetaia.[6]
References
[edit]- ^ Li, Luoyang; Zhang, Xingliang; Skovsted, Christian B.; Yun, Hao; Li, Guoxiang; Pan, Bing (2019). "Shell microstructures of the helcionelloid mollusc Anabarella australis from the lower Cambrian (Series 2) Xinji Formation of North China". Journal of Systematic Palaeontology. 17 (20): 1–11. doi:10.1080/14772019.2018.1546236. S2CID 91387101.
- ^ a b Gubanov, A.; Skovsted, C.; Peel, J. (2004). "Anabarella australis (Mollusca, Helcionelloida) from the Lower Cambrian of Greenland". Geobios. 37 (6): 719–724. doi:10.1016/j.geobios.2003.05.009.
- ^ a b c d Kouchinsky, A. V. (1999). "Shell microstructures of the Early Cambrian Anabarella and Watsonella as new evidence on the origin of the Rostroconchia". Lethaia. 32 (2): 173–180. doi:10.1111/j.1502-3931.1999.tb00537.x.
- ^ Vendrasco, Michael J.; Porter, Susannah M.; Kouchinsky, Artem; Li, Guoxiang; Fernandez, Christine Z. (2010). "New data on molluscs and their shell microstructures from the Middle Cambrian Gowers Formation, Australia". Palaeontology. 53 (1): 97–135. doi:10.1111/j.1475-4983.2009.00922.x.
- ^ Peel, J. S. (1991). "Functional Morphology of the Class Helcionelloida Nov., and the Early Evolution of the Mollusca". In Simonetta, A. M.; Conway Morris, S (eds.). The Early Evolution of Metazoa and the Significance of Problematic Taxa. Cambridge University Press. pp. 157–177. ISBN 978-0-521-40242-2.
- ^ Vendrasco, M.J.; Checa, A.G.; Kouchinsky, A.V. (2011). "Shell microstructure of the early bivalve Pojetaia and the independent origin of nacre within the Mollusca". Palaeontology. 54 (4): 825–850. doi:10.1111/j.1475-4983.2011.01056.x.
Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction