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The architecture of Permian glossopterid ovuliferous reproductive organs

Mcloughlin, Stephen ; Prevec, Rose

Alcheringa (Sydney), 2019-10, Vol.43 (4), p.480-510 [Periódico revisado por pares]

Taylor & Francis

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  • Título:
    The architecture of Permian glossopterid ovuliferous reproductive organs
  • Autor: Mcloughlin, Stephen ; Prevec, Rose
  • Assuntos: Den föränderliga jorden ; Ecosystems and species history ; Ekosystem och arthistoria ; fructifications ; Glossopteris ; Gondwana ; phylogeny ; plant anatomy ; reproductive biology ; The changing Earth
  • É parte de: Alcheringa (Sydney), 2019-10, Vol.43 (4), p.480-510
  • Descrição: McLoughlin, S. & Prevec, R. 20 September 2019. The architecture of Permian glossopterid ovuliferous reproductive organs. Alcheringa XX, xxx-xxx. ISSN 0311-5518 A historical account of research on glossopterid ovuliferous reproductive structures reveals starkly contrasting interpretations of their architecture and homologies from the earliest investigations. The diversity of interpretations has led to the establishment of a multitude of genera for these fossil organs, many of the taxa being synonymous. We identify a need for taxonomic revision of these genera to clearly demarcate taxa before they can be used effectively as palaeobiogeographic or biostratigraphic indices. Our assessment of fructification features based on extensive studies of adpression and permineralized fossils reveals that many of the character states for glossopterids used in previous phylogenetic analyses are erroneous. We interpret glossopterid fertiligers to have been borne in loose strobili in which individual polysperms represent fertile cladodes of diverse morphologies subtended by a vegetative leaf or bract. Polysperms within the group are variously branched or condensed with ovule placement ranging from marginal to abaxial, in some cases occurring on recurved branchlets or in cupule-like structures. Glossopterid polysperms of all types are fringed by one or two ranks of wing-like structures that may represent the remnants of megasporophylls that were, ancestrally, developed on the fertile axillary shoot. Glossopterid fertiligers have similarities to the condensed bract/ovuliferous scale complexes of conifer cones, but comparisons with Mesozoic seed-ferns are hindered by insufficient data on the arrangement and homologies of the ovule-bearing organs of the latter group. Nevertheless, glossopterid polysperms differ from the ovuliferous organs of Mesozoic seed-ferns by longitudinal versus transverse folding, respectively. Stephen McLoughlin* [ steve.mcloughlin@nrm.se ], Department of Palaeobiology, Swedish Museum of Natural History, Box 50007, 104 05 Stockholm, Sweden; Rose Prevec [ r.prevec@am.org.za ], Department of Earth Sciences, Albany Museum, 40 Somerset Street, Makhanda, 6139, Eastern Cape, South Africa, and Department of Botany, Rhodes University, PO Box 94, Makhanda, 6140, Eastern Cape, South Africa.
  • Editor: Taylor & Francis
  • Idioma: Inglês
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