Micrina

Micrina
Scientific classification
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.

Micrina can be considered a stem group brachiopod based on its larval shell.

Its microstructure is very brachiopod like and its adult morphology is similarly bivalved, even though it was once thought to be halkieriid-like.

Micrina is quite similar to Mickwitzia in terms of shell microstructure. The two genera are evidently closely related.

Species

M. etheridgei (Tate, 1892)
M. pusilla Gravestock et al., 2001
M. ridicula (Barskova, 1988)
M. xiaotanensis Li & Xiao, 2004

References

↑ 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)
↑ Li G.-X., Xiao S.-H. (2004). "Tannuolina and Micrina (Tannuolinidae) from the Lower Cambrian of Eastern Yunnan, South China, and Their Scleritome Reconstruction". J. Paleontol. 78 (5): 900–913. doi:10.1666/0022-3360(2004)078<0900:TAMTFT>2.0.CO;2. JSTOR 4094916. S2CID 131286565.

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[McMenaminMickwitzia1992-1] 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.

[2] 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)

[3] 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)

[4] 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)

[5] 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)

[6] Li G.-X., Xiao S.-H. (2004). "Tannuolina and Micrina (Tannuolinidae) from the Lower Cambrian of Eastern Yunnan, South China, and Their Scleritome Reconstruction". J. Paleontol. 78 (5): 900–913. doi:10.1666/0022-3360(2004)078<0900:TAMTFT>2.0.CO;2. JSTOR 4094916. S2CID 131286565.