title: A new late Cenozoic species of Abertella (Echinoidea: Clypeasteroida) from Patagonia.
abstract: A new species of abertellid sand dollar, Abertella miskellyi n. sp., is described from the Miocene Camarones Formation of Patagonia, southern Argentina. The new taxon corroborates the existence of the genus in South America, given that Abertella is most common in the southeastern USA and the eastern coast of Central America. It is characterized by a unique basicoronal circle, in which the interambulacral basicoronal plates are very heterogeneous in size (small in interambulacrum 5, largest in interambulacra 2 and 3). Additionally, it features disjunct oral interambulacra involving two ambulacral plates in some of the interambulacra rather than one, thus being the most disjunct of all known species of Abertella. A key to the species of the genus is provided.
authors.affiliation: Naturhistorisches Museum Wien, Burgring 7, 1010 Vienna, Austria; Email: andreas.kroh@nhm-wien.ac.at.
authors.forename: Andreas
authors.initials: A
authors.lastname: Kroh
authors.affiliation: California Academy of Sciences, Department of Invertebrate Zoology and Geology, 55 Music Concourse Drive, San Francisco, California 94118, USA; Email: rmooi@calacademy.org.
authors.forename: Rich
authors.initials: R
authors.lastname: Mooi
authors.affiliation: Museo Argentino de Ciencias Naturales Bernardino Rivadavia, División Paleoinvertebrados, Angel Gallardo 470, (C1405DJR) Buenos Aires, Argentina; Email: claudiajdelrio@gmail.com.
authors.forename: Claudia
authors.initials: C
authors.lastname: Del Río
authors.affiliation: Museum für Naturkunde, Leibniz Institute for Research on Evolution and Biodiversity, Invalidenstraße 43, 10115 Berlin, Germany; Email: christian.neumann@mfn-berlin.de.
authors.forename: Christian
authors.initials: C
authors.lastname: Neumann
mesh_terms: D000818:Animals; D001118:Argentina; D005580:Fossils; D010802:Phylogeny; D012617:Sea Urchins / Q000033:anatomy & histology* / Q000145:classification*