Kroh Andreas, Mooi Rich, Del Río Claudia, Neumann Christian
Naturhistorisches Museum Wien, Burgring 7, 1010 Vienna, Austria; Email:
California Academy of Sciences, Department of Invertebrate Zoology and Geology, 55 Music Concourse Drive, San Francisco, California 94118, USA; Email:
Zootaxa. 2013 Jan 22;3608:369-78. doi: 10.11646/zootaxa.3608.5.5.
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.
从阿根廷南部巴塔哥尼亚的中新世卡马罗内斯组中描述了一种新的阿贝特尔海胆，米氏阿贝特尔海胆（Abertella miskellyi n. sp.）。鉴于阿贝特尔海胆在南美洲最为常见，而阿贝特尔属在美国东南部和中美洲东海岸最为常见，这个新分类单元证实了该属在南美洲的存在。它的特征是具有独特的基部冠圈，其中间步带基部冠板的大小非常不均一（在间步带5中较小，在间步带2和3中最大）。此外，它的口部间步带分离，在一些间步带中涉及两个步带板而不是一个，因此是所有已知阿贝特尔海胆物种中分离度最大的。提供了该属物种的检索表。
