Volume 29 1992

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    Palaeontologia africana Volume 29
    (Bernard Price Institute for Palaeontological Research, 1992)
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    A method of improving contrast in illustrations of coalified fossils
    (Bernard Price Institute for Palaeontological Research, 1992) Rayner, Richard J
    A simple, economic method of enhancing the contrast and, therefore, improving the qual ity of certain palaeontological photographic illustrations is outlined. The technique, which involves the use of polarising filters, in no way alters the negatives or prints. In recommending this technique, it is hoped some of the confusion arising from inadequate illustrations will be removed.
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    First record of Triassic Rhynchosauria (Reptilia: Diapsida) from the Lower Zambezi Valley, Zimbabwe
    (Bernard Price Institute for Palaeontological Research, 1992) Raath, Michael A; Oesterlen, P M; Kitching, James W
    True rhynchosaurids are described from Zimbabwe for the first time. The fossils occur as partially associated skeletons and scattered isolates in upward-fining, micaceous fluvial sandstones of the Pebbly Arkose Formation (late Triassic) in the Western Cabora Bassa Basin, Lower Zambezi Valley. On the grounds that the dentary of the Zimbabwean form possesses a row of small, conical lingual teeth in addition to a palisade row of penicillate teeth on the occlusal surface, it is concluded that the taxon present is Hyperodapedon sp., and that it is closely related to a rhynchosaurid described from Tanzania. One bone identified as a prosauropod dinosaurian femur was found associated with the Zimbabwean rhynchosaurids. The late Triassic age suggested by the presence of advanced rhynchosaurids is supported by the occurrence of the typical Triassic fossil plant genus Dicroidium, and by the general stratigraphy of the beds which contain the fossils (i.e. the fossil-bearing beds are underlain by beds of mid-Triassic age or younger, and are overlain by beds of latest Triassic or early Jurassic age)
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    An enigmatic new reptile from the Lower Triassic Fremouw Formation of Antarctica
    (Bernard Price Institute for Palaeontological Research, 1992) Gow, Chris E
    The partial skull of a new reptile from the Lower Triassic of Antarctica is described: It has a distinctive procolophon-like dentition, but other features suggest it is a diapsid. The name Fremouwsaurus geludens is proposed for the new animal. It is not possible to place the new form in any known higher taxon, so it is necessary to establish a new Family Fremouwsauridae to receive it.
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    Taxonomic status of the partial calvaria a.l. 333-45 from the Late Pliocene of Hadar, Ethiopia
    (Bernard Price Institute for Palaeontological Research, 1992) Ferguson, Walter W
    The taxonomic status of a partial calvaria, A.L. 333-45, from the late Pliocene of Hadar, in Ethiopia, classified as a hominid and paratype of "Australopithcus afarensis" Johanson, White and Coppens 1978 is reassessed. Its total morphological pattern and adaptive affinities agree with the Pongidae, and do not exhibit a single unequivocal hominid character. The evidence in fact suggests that A.L. 333-45 represents a relatively generalized ape, the only pongid calvaria known from the late Pliocene of Africa: and may be the first skull found of Praeanthropus africanus (Weinert), 1950. Moreover, this indicates that the fossils assigned to "Australopithecus afarensis'' do not represent a single taxon: and that the reconstruction of the skull of a male "A. afarensis" seems to be a composite of pongid and hominid fossils.