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Micrina
Scientific classification
Domain:
Eukaryota
Kingdom:
Animalia
Order:
†"Tommotiida"
Genus:
†Micrina Laurie, 1986
Type species
Platyceras etheridgei
Tate, 1892
Species
M. etheridgei
M. pusilla
M. ridicula
M. xiaotanensis
Micrina is an extinct genus of tommotiids with affinities to brachiopods.[1]
Micrina can be considered a stem group brachiopod based on its larval shell[2]
Its microstructure is very brachiopod like[3] and its adult morphology is similarly bivalved,[4] even though it was once thought to be halkieriid-like.[5]
Micrina is quite similar to Mickwitzia in terms of shell microstructure. The two genera are evidently closely related.
^McMenamin, M. A. S. (1992). "Two new species of the Cambrian genus Mickwitzia". Journal of Paleontology. 66 (2): 173–182. doi:10.1017/S0022336000033680. JSTOR 1305903. S2CID 132405917.
^Holmer L. E., Skovsted C. B., Larsson C., Brock G. A., Zhang Z. (2011). "First record of a bivalved larval shell in Early Cambrian tommotiids and its phylogenetic significance". Palaeontology. 54 (2): 235–239. doi:10.1111/j.1475-4983.2010.01030.x.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^Balthasar U., Skovsted C. B., Holmer L. E., Brock G. A. (2009). "Homologous skeletal secretion in tommotiids and brachiopods". Geology. 37 (12): 1143–1146. Bibcode:2009Geo....37.1143B. doi:10.1130/g30323a.1.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^Holmer L. E., Skovsted C. B., Brock , Valentine J. L., Paterson J. R. (2008). "The Early Cambrian tommotiid Micrina, a sessile bivalved stem group brachiopod". Biol. Lett. 4 (6): 724–728. doi:10.1098/rsbl.2008.0277. PMC 2614141. PMID 18577500.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^Holmer L. E., Skovsted C. B., Williams A. (2002). "A stem group brachiopod from the lower Cambrian: support for a Micrina (Halkieriid) ancestry". Palaeontology. 45 (5): 875–882. doi:10.1111/1475-4983.00265.{{cite journal}}: CS1 maint: multiple names: authors list (link)
Micrina is an extinct genus of tommotiids with affinities to brachiopods. Micrina can be considered a stem group brachiopod based on its larval shell...
brachiopods. One crucial fossil linking the tommotiids with brachiopods is Micrina. Analysis on the microscopic inner structure of the phosphatic shell has...
characteristic shell microstructure in common with Tommotiids such as Micrina, and like this taxon, mickwitziids may not have been able to enclose their...
examples hint that some species bore carbonate or carbonaceous sclerites. Micrina and Paterimitra possess bivalved shells in their larval phases, which preserve...
fossil interpreted as a stem-group Brachiopod. It consists of a pair of Micrina-like shells that broadly follow a logarithmic coiling trajectory with a...
conventionally interpreted as an essentially bivalved organism, similar to Micrina, though some use the unequal ratio of stellate to mitrate sclerites to...
Valentine, J.L.; Paterson, J. R. (June 2008). "The Early Cambrian tommotiid Micrina, a sessile bivalved stem group brachiopod". Biology Letters. 4 (6): 724–8...
distinguishes tommotiid species. In all groups, except the tannuolinids (such as Micrina), the sclerites are asymmetrical. The structure and distribution of sclerites...
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