Crassispira acuticosta Mautodontha acuticosta Dalader Mautodontha Cretonia Unioninae Rissoa List of the Cenozoic life of Delaware Unionidae List of recently extinct molluscs List of recently extinct invertebrates Crassispira List of the Paleozoic life of Montana List of least concern molluscs List of Oceanian species extinct in the Holocene IUCN Red List of extinct species List of the Cenozoic life of Maryland List of the Paleozoic life of Utah 2012 in arthropod paleontology Blanfordiceras 2023 in paleomalacology Paleobiota of the Posidonia Shale