Anabarella

{{Short description|Extinct genus of molluscs}} {{Automatic taxobox |fossil_range = {{fossil range|Lower Cambrian}} |taxon = Anabarella |authority = |subdivision_ranks = Species |subdivision = {{species list | A. plana|Vostokova, 1962 | A. australis |}} | synonyms = {{species list | Planutenia | <ref>{{Cite journal | doi=10.1080/14772019.2018.1546236 | title=Shell microstructures of the helcionelloid mollusc Anabarella australis from the lower Cambrian (Series 2) Xinji Formation of North China| journal=Journal of Systematic Palaeontology| pages=1–11| year=2019| last1=Li| first1=Luoyang| last2=Zhang| first2=Xingliang| last3=Skovsted| first3=Christian B.| last4=Yun| first4=Hao| last5=Li| first5=Guoxiang| last6=Pan| first6=Bing| volume=17| issue=20| bibcode=2019JSPal..17.1699L| s2cid=91387101| url=http://urn.kb.se/resolve?urn=urn:nbn:se:nrm:diva-3373}}</ref> }} }}

'''''Anabarella''''' is a species of bilaterally-flattened monoplacophoran mollusc,<ref name="Gubanov2004" /> with a morphological similarity to the rostroconchs.<ref name='Kouchinsky2007'>{{cite journal | last = Kouchinsky | first = A. V. | year = 1999 | title = Shell microstructures of the Early Cambrian ''Anabarella'' and ''Watsonella'' as new evidence on the origin of the Rostroconchia | journal = Lethaia | volume= 32| issue= 2 |pages= 173–180 | doi = 10.1111/j.1502-3931.1999.tb00537.x| bibcode = 1999Letha..32..173K }}</ref> 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.<ref name='Kouchinsky2007'/> Its internal microstructure is calcitic and semi-nacreous.<ref name="Vendrasco2010">{{Cite journal | last1 = Vendrasco | first1 = Michael J. | last2 = Porter | first2 = Susannah M. | last3 = Kouchinsky | first3 = Artem | last4 = Li | first4 = Guoxiang | last5 = Fernandez | first5 = Christine Z. | title = New data on molluscs and their shell microstructures from the Middle Cambrian Gowers Formation, Australia | journal = Palaeontology | volume = 53 | issue = 1 | pages = 97–135 | year = 2010 | doi = 10.1111/j.1475-4983.2009.00922.x | doi-access = free | bibcode = 2010Palgy..53...97V }}</ref> Its name reflects its provenance from Anabar, Siberia.<ref name='Kouchinsky2007'/> It has been interpreted as ancestral to the rostroconchs,<ref>{{Peel 1991}}</ref> and has been aligned to the Helcionellidae.<ref name="Gubanov2004">{{Cite journal | last1 = Gubanov | first1 = A. | last2 = Skovsted | first2 = C. | last3 = Peel | first3 = J. | title = ''Anabarella australis'' (Mollusca, Helcionelloida) from the Lower Cambrian of Greenland | journal = Geobios | volume = 37 | issue = 6 | pages = 719–724 | year = 2004 | doi = 10.1016/j.geobios.2003.05.009 | bibcode = 2004Geobi..37..719G }}</ref>

The genus is closely related to ''Watsonella'', with which it bears many morphological similarities,<ref name="Kouchinsky2007" /> including a laminar internal shell microstructure said to connect it with the early bivalves ''Fordilla'' and ''Pojetaia''.<ref name="Vendrasco2011">{{Cite journal | last1 = Vendrasco | first1 = M.J. | last2 = Checa | first2 = A.G. | last3 = Kouchinsky | first3 = A.V. | title = Shell microstructure of the early bivalve ''Pojetaia'' and the independent origin of nacre within the Mollusca | journal = Palaeontology | volume = 54 | issue = 4 | pages = 825–850 | year = 2011 | doi = 10.1111/j.1475-4983.2011.01056.x | doi-access = free | bibcode = 2011Palgy..54..825V }}</ref>

==References== {{Reflist}}

Category:Cambrian molluscs