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dc.contributor.author Bates, Denis E. B.
dc.contributor.author Urbanek, A.
dc.date.accessioned 2011-09-06T09:54:57Z
dc.date.available 2011-09-06T09:54:57Z
dc.date.issued 2011-09-06
dc.identifier.citation Bates , D E B & Urbanek , A 2011 , ' The ultrastructure, development, and systematic position of the graptolite genus Mastigograptus ' Acta Palaeontologica Polonica , vol 47 , no. 3 , pp. 445-458 . en
dc.identifier.issn 1732-2421
dc.identifier.other PURE: 170373
dc.identifier.other dspace: 2160/7548
dc.identifier.uri http://hdl.handle.net/2160/7548
dc.description Bates, D. E. B., Urbanek, A. (2002). The ultrastructure, development, and systematic position of the graptolite genus Mastigograptus. Acta Palaeontologica Polonica, 47(3), 445-458. en
dc.description.abstract Fragments of rhabdosomes isolated by chemical treatment from an erratic boulder of Baltic origin and ?Middle Ordovician age, provisionally assigned to Mastigograptus aff.tenuiramosus (Wallcott, 1881) were studied with SEM. Although exceptionally well preserved, remains lack the thin-walled free portions of thecae. Rhabdosomes are provided with a strongly developed basal disc, short stem and many branched stipes. The latter consist of heavily corticalized chains of stolothecae with alternately disposed thecal bases. Stolothecae display a morphological gradient and increase in size and change in shape distalwards. The stolon system studied with SEM on naturally and artificially broken specimens, as well as traced through open thecal bases, reveals a regular triad budding but no stolon inside the stolothecal cavity. We tentatively suggest that crassal lining, recognized earlier by TEM studies, corresponds to an unusually inflated stolonal stolon, filling the entire thecal. cavity and adhering tightly to stolothecal wall. The systematic position of Mastigograptus, a matter of long debate, seems to be defined by a number of structural features which imply a distinct difference between genus in question and all known orders of sessile graptolites. The order Mastigograptida nov. and the family Mastigograptidae nov. are proposed. en
dc.format.extent 14 en
dc.language.iso eng
dc.relation.ispartof Acta Palaeontologica Polonica en
dc.title The ultrastructure, development, and systematic position of the graptolite genus Mastigograptus en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.contributor.institution Institute of Geography & Earth Sciences en
dc.contributor.institution Other IGES Research en
dc.description.status Peer reviewed en


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