Bivalvia - Lucinida - Lucinidae
Full reference: R. B. Stewart. 1930. Gabb's California Cretaceous and Tertiary type lamellibranchs. The Academy of Natural Sciences of Philadelphia Special Publication 3:1-314
Parent taxon: Miltha according to R. B. Stewart 1930
See also Sepkoski 2002, Vokes 1969 and Woodring 1982
Sister taxa: Lucina (Miltha) contorta, Miltha (Matanziella), Miltha (Miltha), Miltha (Recticardo), Miltha africana, Miltha childreni, Miltha chipolana, Miltha claibornensis, Miltha hamptonensis, Miltha hillsboroensis, Miltha inflata, Miltha merangiana, Miltha pandata, Miltha xantusi, Phacoides (Miltha) hernandoensis
Subtaxa: none
Type: Cyclas claibornensis
Ecology: facultatively mobile deep infaunal chemosymbiotic
Distribution:
• Eocene of United States (3: Alabama, Louisiana, Mississippi collections)
• Paleocene of United States (1: California)
Total: 4 collections each including a single occurrence