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      A new specimen of Millerocaulis (Osmundales: Osmundaceae) from the Cerro Negro Formation (Lower Cretaceous), Antarctica Translated title: Un nuevo especimen de Millerocaulis (Osmundales: Osmundaceae) de la Formación Cerro Negro (Cretácico Inferior), Antártida

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          Abstract

          A new petrified stem of Millerocaulis Erasmus ex Tidwell emend. Vera, collected in the Aptian Cerro Negro Formation outcrops of Livingston Island (Antarctica), is described in detail. This specimen is probably conspecific with Millerocaulis australis (Vera), from the same unit, but it is smaller than the holotype and only known specimen of the latter species. Furthermore, differences between several characteristics of both specimens are observed. A discussion based on biological aspects of this group of plants is given, taking into account the ontogenetic variability. A conservative referral of the new specimen to M. australis is preferred over the proposal of a new morphotaxon for the inclusion of the new materials.

          Translated abstract

          Se describe en detalle un nuevo estípite petrificado de Millerocaulis Erasmus ex Tidwell emend. Vera, colectado en afloramientos de edad aptiana de la Formación Cerro Negro en Isla Livingston (Antártida). Este espécimen es probablemente coespecífico con Millerocaulis australis (Vera), procedente de la misma unidad, pero es mas pequeño que el holotipo (y único ejemplar conocido) de dicha especie. Además, existen diferencias entre ambos especímenes. Se brinda una discusión basada en aspectos biológicos de este grupo de plantas, teniendo en cuenta la variación ontogenética. Se opta por referir de manera conservativa el nuevo espécimen a M. australis, antes que proponer un nuevo morfotaxón para la inclusión de los nuevos materiales.

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          Comparative Morphology of the Osmundaceae

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            Osmunda cinnamomea(Osmundaceae) in the Upper Cretaceous of Western North America: Additional Evidence for Exceptional Species Longevity among Filicalean Ferns

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              The pteridophyteAshicaulis livingstonensis(Osmundaceae) from the Upper Cretaceous of Williams Point, Livingston Island, Antarctica

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                Author and article information

                Contributors
                Role: ND
                Journal
                rmacn
                Revista del Museo Argentino de Ciencias Naturales
                Rev. Mus. Argent. Cienc. Nat.
                Museo Argentino de Ciencias Naturales Bernardino Rivadavia e Instituto Nacional de Investigación de las Ciencias Naturales (Ciudad Autónoma de Buenos Aires )
                1853-0400
                June 2010
                : 12
                : 1
                : 41-46
                Affiliations
                [1 ] Consejo Nacional de Investigaciones Científicas y Técnicas Argentina
                Article
                S1853-04002010000100005
                10.22179/revmacn.12.250
                b76661b2-a7cd-44ae-a4ec-12b4fe3e79fa

                http://creativecommons.org/licenses/by/4.0/

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                SciELO Argentina

                Self URI (journal page): http://www.scielo.org.ar/scielo.php?script=sci_serial&pid=1853-0400&lng=en
                Categories
                ZOOLOGY

                Animal science & Zoology
                Millerocaulis,Osmundaceae,Cretaceous,Cerro Negro Formation,Antarctica,Cretácico,Formación Cerro Negro,Antártida

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