The Albertellidae are large non-lunulate sand dollars found in the Miocene of North and South America. There is a single genus, Abertella, which has a large 'shield'-like test where the interambulacra are discontinuous (do not meet) and there is a distinct posterior notch (Mooi et al. 2018). In the United States, Abertella aberti has been primarily associated with the Choptank Formation in Maryland, though also noted in the Pungo River Formation of North Carolina (McKinney 1985). In Florida, three additional species have been described: Abertella dengleri, with its distinctive wide test, from the Peace River Formation (Osborn and Ciampaglio 2010); Abertella carlsoni (the smallest species) from the Tampa Member of the Arcadia Formation, and Abertella floridana from the Torreya Formation and likely the Chipola Formation (Osborn et al. 2020). There may be additional species as yet uncovered, as fragmented specimens referable to the genus are known from additional formations in Florida (Osborn et al. 2020).
