Kainella Walcott, 1925 (Trilobita, Ordovicico Temprano) en el Noroeste de Argentina y Sur de Bolivia. Parte 1: Paleontología sistemática

VACCARI, N.E Y WAISFELD, B.G.

AMEGHINIANA

ASOCIACION PALEONTOLOGICA ARGENTINA

Lugar: Buenos Aires; Año: 2009

0002-7014

Kainella Walcott, 1925 (Trilobita, Early Ordovician) in the northwestern Argentina and Southern of Bolivia. Part 1: Systematic Paleontology. A taxonomic study involving different species of Kainella from the Central Andean Basin is conducted. Kainella species are early Tremadocian in age and come from the Santa Rosita, Cardonal, and Devendeus fromations, and from the Guayoc Chico Group that crop out in numerous localities of the Argentine Cordillera Oriental. Also, Kainella species from the Iscayachi Formation exposed in the Yunchará Segment in southern Bolivia are analysed. A group of eight species is recognized suggesting a diversity significantly greater than previously assessed. An emmended diagnosis of K. meridionalis Kobayashi is provided, and a lectotype is designated. On this basis some of the former assignments to this species are now accommodated in the taxa described herein. Complete morphological information on K. andina Suárez Soruco is provided upon new collections from its type locality (cuesta de Erquis), and from Argentina. The new species K. teiichii sp. nov., K. morena sp. nov., Kainella sp. nov. A and Kainella sp. nov. B. are described and illustrated. Besides, K. colombiana Harrington and Kay from the Güéjar Group (Tremadocian-Floian, sierra de La Macarena, Colombia) is tentatively referred to Naustia Ludvigsen of Late Cambrian age.