Micrina

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 is an extinct genus of brachiopods.

It's a tommotiid that probably sits within the Brachiopod crown, based on, if nothing else, its larval shell[1]

Its microstructure is very brachiopod like[2] and its adult morphology is bivalved too,[3] even though it was once thought to be halkieriid-like [4]

It's quite similar to Mickwitzia and is probably closely related.

Species

  • M. etheridgei (Tate, 1892)
  • M. pusilla Gravestock et al., 2001
  • M. ridicula (Barskova, 1988)
  • M. xiaotanensis Li & Xiao, 2004[5]

References

  1. ↑ Holmer, L. E., Skovsted, C. B., Larsson, C., Brock, G. A. & Zhang, Z. First record of a bivalved larval shell in Early Cambrian tommotiids and its phylogenetic significance. Palaeontology 54, 235–239 (2011).
  2. ↑ 1. Balthasar, U., Skovsted, C. B., Holmer, L. E. & Brock, G. A. Homologous skeletal secretion in tommotiids and brachiopods. Geology 37, 1143–1146 (2009).
  3. ↑ Holmer, L. E., Skovsted, C. B., Brock, G. a, Valentine, J. L. & Paterson, J. R. The Early Cambrian tommotiid ~Micrina~, a sessile bivalved stem group brachiopod. Biol. Lett. 4, 724–728 (2008).
  4. ↑ 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 (2002).
  5. ↑ Li, G.-X. & Xiao, S.-H. Tannuolina and Micrina (Tannuolinidae) from the Lower Cambrian of Eastern Yunnan, South China, and Their Scleritome Reconstruction. J. Paleontol. 78(5), 900–913 (2004). doi:10.1666/0022-3360(2004)078<0900:TAMTFT>2.0.CO;2 JSTOR 4094916


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