Volume 19 1976

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    Palaeontologia africana Volume 19
    (Bernard Price Institute for Palaeontological Research, 1976)
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    An unusual mayfly (Insecta: Ephemeroptera) from the Triassic of South Africa
    (Bernard Price Institute for Palaeontological Research, 1976) Riek, E. F.
    An unusual mayfly from the Upper Triassic near Dordrecht in the Cape Province of South Africa is described as Xenophlebia optata gen. et sp. nov., and is ascribed to a new family, the Xenophlebiidae, as its sole representative.
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    An entomobryid collembolan (Hexapoda: Collembola) from the Lower Permian of Southern Africa
    (Bernard Price Institute for Palaeontological Research, 1976) Rick, E. F.
    Permobrya mirabilis gen. et sp. nov., recorded from carbonaceous shales of the Middle Ecca of southern Africa, is a rather large entomobryid collembolan. The specimen, preserved in lateral view, is complete except for the dentes and mucrones of the furcula and details of the claws which are not visible in the shale matrix. The species is surprisingly similar to Recent Collembola.
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    On some "northern" elements in the Lower Gondwana flora of Vereeniging, Transvaal
    (Bernard Price Institute for Palaeontological Research, 1976) le Roux, S. F.
    A small assemblage of plant elements from the Lower Permian of Vereeniging, in the southern Transvaal, is described here. The assemblage is constituted of form-genera normally only found in the palaeo floristic regions of the northern hemisphere. The genera concerned are: Pecopteris (Asterotheca), Cladophlebis, Sphenophyllum and Psygmophyllum. The intermingling of these "Northern" elements with the Glossopteris flora of Vereeniging serves to illustrate the mixed nature of this flora. Reference is made to similar mixed Gondwana floras elsewhere in Africa and also in South America.
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    Notes on some Glossopteris species from Hammanskraal (Transvaal)
    (Bernard Price Institute for Palaeontological Research, 1976) Kovacs- Endrody, E.
    The study of Glossopteris began with the mistake that two half fronds were glued together as one and that specimen was chosen as the holotype of one of the first Glossopteris ever described, Glossopteris browniana var. indica Bngn. The mistake led to confusion and even to distrust of the possibility of identifying Glossopteris species on frond impressions only. As most of the GIossopteris remains are such, and the literature from Brongniart onwards is mainly based on them, the frond morphography is bound to be the starting point of the classification. The present paper shows that (a) with the examination of greater numbers of specimens, it is possible to select the specific characters and to learn the individual variations and (b) identifications can only be based on the original descriptions and figures of the taxa.