Bivalvia - Cardiida - Tellinidae
Alternative spelling: Rexithaerus
Parent taxon: Macoma according to E. J. Moore 2003
See also Durham 1944, Oldroyd 1925, Sepkoski 2002 and Todd 2001
Sister taxa: Macoma (Austromacoma), Macoma (Bendemacoma), Macoma (Heteromacoma), Macoma (Macoma), Macoma (Macoploma), Macoma (Panacoma), Macoma (Psammacoma), Macoma (Salmacoma), Macoma (Scissulina), Macoma albaria, Macoma astori, Macoma brota, Macoma constricta, Macoma costaricana, Macoma danai, Macoma edentula, Macoma fusca, Macoma inornata, Macoma kirkinskayae, Macoma lenis, Macoma limula, Macoma lissoni, Macoma marylandica, Macoma meroensis, Macoma montesanoensis, Macoma nasuta, Macoma osakaensis, Macoma pabloensis, Macoma simizuensis, Macoma snohomishensis, Macoma sookensis, Macoma tenta, Macoma tenuiplicata, Macoma tigilensis, Macoma uruguayensis, Macoma viticola, Macoma wilcoxi, Macoma wynootcheensis, Macoma yamadai
Subtaxa: Macoma (Rexithaerus) addicotti Macoma (Rexithaerus) andersoni Macoma (Rexithaerus) copelandi Macoma (Rexithaerus) dexioptera Macoma (Rexithaerus) diabloensis Macoma (Rexithaerus) indentata Macoma (Rexithaerus) panzana Macoma (Rexithaerus) rosa Macoma (Rexithaerus) sespeensis Macoma (Rexithaerus) vanvlecki Rexithaerus expansa Rexithaerus secta
Ecology: facultatively mobile infaunal deposit feeder
Distribution:
• Quaternary of Mexico (2 collections), New Zealand (1), United States (28: California)
• Pliocene of United States (18: California)
• Hemphillian of United States (1: California)
• Miocene to Pliocene of United States (3: California)
• Miocene of the Dominican Republic (2), Japan (1), New Zealand (1), the Russian Federation (2), United States (17: California)
• Oligocene of United States (3: Alaska, Washington)
• Eocene of United States (8: California)
• Paleocene of United States (1: California)
Total: 88 collections including 105 occurrences