caa a22 4500 388017333 CHVBK 20180307124914.0 cr unu---uuuuu 161130e199803 xx s 000 0 eng 10.1017/S0022336000036283 doi S0022336000036283 pii (NATIONALLICENCE)cambridge-10.1017/S0022336000036283 Ontogeny and systematics of Toernquistiidae (Trilobita, Proetida) from the Ordovician of the Argentine Precordillera [Elektronische Daten] [Brian D. E. Chatterton, Gregory D. Edgecombe, Beatriz G. Waisfeld, Norberto E. Vaccari] The following new Toernquistiidae from Whiterockian (Llanvirn to lower Caradoc) strata of the Precordillera, western Argentina, are described: Chomatopyge canasi new species, Lasarchopyge benedettoi new genus and species, Lasarchopyge correae new genus and species, Lasarchopyge new species A, and Paratoernquistia sanchezae new genus and species. Phylogenetic analysis suggests that the Toernquistiidae Hupé, 1953 (including Chomatopyge, Lasarchopyge, Mesotaphraspis, Paratoernquistia, and Toernquistia) is closely related to but distinct from the Dimeropygidae Hupé, 1953 (including Ischyrotoma, Ischyrophyma and Dimeropyge). It is difficult to find unique synapomorphies that unite toernquistiids and dimeropygids into a monophyletic group that excludes other proetides (e.g., hystricurids), although details of their ontogenies are similar. Several species of Toernquistiidae are known from the Argentine Precordillera (one species previously described), and other species of this family have been described from Australia, Baltica, China, Kazakhstan and Laurentia. Members of the Dimeropygidae are known only from Baltica and Laurentia. Copyright © The Paleontological Society Chatterton Brian D. E. Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, T6G 2E3, Canada aut Edgecombe Gregory D. Division of Earth and Environmental Sciences, Australian Museum, 6 College Street, Sydney South, NSW 2000, Australia aut Waisfeld Beatriz G. División Paleozoología de Invertebrados, Museo Argentino de Ciencias Naturales "Bernardino Rivadavia”, Avenida ángel Gallardo 470, 1405 Buenos Aires, Argentina aut Vaccari Norberto E. CONICET, Cátedra de Estratigrafía y Geología Histórica, Universidad Nacional de Córdoba, Avenida Vélez Sársfield 299, 5000 Córdoba, Argentina aut Journal of Paleontology Cambridge University Press 72/2(1998-03), 273-303 0022-3360 72:2<273 1998 72 JPA https://doi.org/10.1017/S0022336000036283 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0022336000036283 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Chatterton Brian D. E. Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, T6G 2E3, Canada aut NATIONALLICENCE 700 1- Edgecombe Gregory D. Division of Earth and Environmental Sciences, Australian Museum, 6 College Street, Sydney South, NSW 2000, Australia aut NATIONALLICENCE 700 1- Waisfeld Beatriz G. División Paleozoología de Invertebrados, Museo Argentino de Ciencias Naturales "Bernardino Rivadavia”, Avenida ángel Gallardo 470, 1405 Buenos Aires, Argentina aut NATIONALLICENCE 700 1- Vaccari Norberto E. CONICET, Cátedra de Estratigrafía y Geología Histórica, Universidad Nacional de Córdoba, Avenida Vélez Sársfield 299, 5000 Córdoba, Argentina aut NATIONALLICENCE 773 0- Journal of Paleontology Cambridge University Press 72/2(1998-03), 273-303 0022-3360 72:2<273 1998 72 JPA CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge