Micrina

Micrina is an extinct genus of tommotiids with affinities to brachiopods [1].

Micrina
Scientific classification
Kingdom: Animalia
Clade: Lophophorata
Order: †"Tommotiida"
Genus: †Micrina
Laurie, 1986
Type species
Platyceras etheridgei
Tate, 1892
Species
  • M. etheridgei
  • M. pusilla
  • M. ridicula
  • M. xiaotanensis

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.

Species
  • M. etheridgei (Tate, 1892)
  • M. pusilla Gravestock et al., 2001
  • M. ridicula (Barskova, 1988)
  • M. xiaotanensis Li & Xiao, 2004[6]

References
  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.
  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: 235–239. doi:10.1111/j.1475-4983.2010.01030.x.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: 1143–1146. doi:10.1130/g30323a.1.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: 724–728. doi:10.1098/rsbl.2008.0277. PMC 2614141.CS1 maint: multiple names: authors list (link)
  5. Holmer L. E., Skovsted C. B., Williams A. "A stem group brachiopod from the lower Cambrian: support for a ~Micrina~ (Halkieriid) ancestry". Palaeontology. 45: 875–882. doi:10.1111/1475-4983.00265.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.


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