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Journal of Paleontology; January 2005; v. 79; no. 1; p. 89-109; DOI: 10.1666/0022-3360(2005)079<0089:TTOFTM>2.0.CO;2
© 2005 Paleontological Society
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TRIARTHRINID TRILOBITES (OLENIDAE) FROM THE MIDDLE AND UPPER ORDOVICIAN, PRECORDILLERA OF ARGENTINA

GREGORY D. EDGECOMBE1, BRIAN D. E. CHATTERTON2, NORBERTO E. VACCARI3 and BEATRIZ G. WAISFELD4

1 Australian Museum, 6 College Street, Sydney, New South Wales 2010,
2 Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton T6G 2E3, Canada,
3 Instituto de Geología y Minería, Universidad Nacional de Jujuy, Avenida Bolivia 1661, C.C. 258, San Salvador de Jujuy, Argentina,
4 CONICET, Centro de Investigaciones Paleobiológicas (CIPAL), Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba, Avenida Vélez Sársfield 299, 5000 Argentina

Middle and Upper Ordovician Triarthrinae from the Precordillera of San Juan, Argentina, include the Whiterock/Llanvirn Porterfieldia turneri (Baldis and Pöthe, 1995) and P. acava new species, and the early Caradoc Triarthrus jachalensis (Harrington and Leanza, 1957). Each of these species is described based on silicified material, including ontogenies, from the Las Aguaditas Formation. Porterfieldia maanssonae new species from the lower member of the Gualcamayo Formation (late Arenig) at Río Gualcamayo, San Juan Province, and Río Guandacol, La Rioja Province, is closely allied to P. turneri. Two protaspid stages are present in Porterfieldia, whereas mineralized protaspid stages are apparently lacking in Triarthrus jachalensis. Triarthrus jachalensis was capable of sphaeroidal enrollment by meraspid degree 2. Precordilleran species bear closest comparison to others from Spitsbergen (Porterfieldia acava n. sp. and P. parapunctata) and Sweden/Norway (Triarthrus jachalensis and T. linnarssoni).






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