Anabarella
| Anabarella Temporal range:
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Scientific classification 
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| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | †Helcionelloida |
| Order: | †Helcionelliformes |
| Family: | †Helcionellidae |
| Genus: | †Anabarella |
| Species | |
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| Synonyms | |
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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
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