Show simple item record Anna en_US Denis E. B. en_US Sergio en_US 2011-06-13T08:46:44Z 2011-06-13T08:46:44Z 2011-06-13 en_US
dc.identifier en_US
dc.identifier.citation Kozlowska , A , Bates , D E B & Piras , S 2011 , ' A new Silurian graptolite, reticuloplectograptus, and its bearing on retiolitid evolution ' Palaeontology , vol 53 , no. 6 , pp. 1411-1417 . , 10.1111/j.1475-4983.2010.01014.x en_US
dc.identifier.other PURE: 166827 en_US
dc.identifier.other dspace: 2160/7044 en_US
dc.description.abstract The retiolitid graptolite Reticuloplectograptus serpaglii gen. et sp. nov. from the Gorstian, lower Ludlow, has been found in two localities: the Bartoszyce borehole of Poland (Baltica), and the Bykos. section, Barrandian, Czech Republic (PeriGondwanan Europe). The Polish material is isolated and was studied under the SEM. The main characters of Reticuloplectograptus are similar to those of Plectograptus: an asymmetrical ancora, simple ancora umbrella with an incompletely developed rim and parallel ventral walls with mid-ventral lists. The paired genicular processes of the new species are similar to but much wider than those of Plectograptus trijunctus and Plectograptus robustus. The main differences between the new genus and Plectograptus are the dense ancora sleeve wall and small proximal lateral orifices of the former. These primitive characters suggest that Reticuloplectograptus might be ancestral to genera with strong reduction in the proximal end, such as Plectograptus, Valentinagraptus and Kirkigraptus. However, Reticuloplectograptus appeared stratigraphically later than Plectograptus, indicating that this aspect of retiolitid evolution is more complicated, needing further study. en_US
dc.format.extent 7 en_US
dc.relation.ispartof Palaeontology en_US
dc.subject silurian en_US
dc.subject Ludlow en_US
dc.subject graptolites en_US
dc.subject Retiolitidae en_US
dc.subject Reticuloplectograptus en_US
dc.subject evolution en_US
dc.title A new Silurian graptolite, reticuloplectograptus, and its bearing on retiolitid evolution en_US
dc.contributor.pbl Institute of Geography & Earth Sciences en_US
dc.contributor.pbl Other IGES Research en_US

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