Rhynchonellata - Orthida - Giraldiellidae
Full reference: A. Williams, S. J. Carlson, C. H. C. Brunton, L. E. Holmer, L. E. Popov, M. Mergl, J. R. Laurie, M. G. Bassett, L. R. M. Cocks, J.-Y. Rong, S. S. Lazarev, R. E. Grant, P. R. Racheboeuf, Y.-G. Jin, B. R. Wardlaw, D. A. T. Harper, and A. D. Wright and M. 2000. Part H Brachiopoda (revised): Volumes 2 & 3, Linguliformea, Craniiformea, Rhynchonelliformea (part). Treatise on Invertebrate Paleontology 1-919
Parent taxon: Plectorthoidea according to A. Williams et al. 2000
See also Benedetto 2003
Sister taxa: Apatoskenidioides, Chilcorthidae, Cremnorthidae, Cyclocoeliidae, Eoorthidae, Euorthisinidae, Finkelnburgiidae, Lebediorthis, Nanorthidae, Phragmorthidae, Platystrophiidae, Plectorthidae, Ranorthidae, Rhactorthidae, Tasmanorthidae, Wangyuiidae
Subtaxa: Comatopoma Famatinorthis Gelidorthina Gelidorthis Giraldiella Kvania Phaceloorthis Proteorthis Scaphorthis Tazzarinia
Type: Giraldiella
Ecology: stationary epifaunal suspension feeder
Distribution:
• Silurian of Argentina (1 collection), the Czech Republic (6), Kazakhstan (1), the United Kingdom (4)
• Dobrotivian of Portugal (1), Spain (2)
• Liben of the Czech Republic (1)
• Arenig of Argentina (4)
• Arenigian of Argentina (3), United States (2: Maine)
• Ordovician of Australia (12), Austria (1), Canada (3: British Columbia), China (1), the Czech Republic (8), Ireland (1), Kazakhstan (6), Morocco (3), Norway (6), Portugal (3), Spain (10), Sweden (1), Turkey (1), the United Kingdom (26), United States (12: Alaska, California, Nevada, Pennsylvania, Virginia)
• Tremadoc of Argentina (5), Bolivia (1), the Czech Republic (1), Germany (1)
• Cambrian of Argentina (2)
Total: 129 collections including 143 occurrences