Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . as Ammonites texanus, was regarded by Matsu-moto as being sufficiently different from P. emscheris to merit separate specificrank as Paratexanites rex. In the present specimen the umbilical tubercles areradially elongated as in the latter species, but the whorl section is not ascompressed. For the present it is considered best to refer to the available specimen asP. sp. aff. P. emscheris. Occurrence Coniacian IV of Zululand. Genus Plesiotexanites Matsumoto, 1970 Type species Mortoniceras kawasakii Kawada, 1929, by the
Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . as Ammonites texanus, was regarded by Matsu-moto as being sufficiently different from P. emscheris to merit separate specificrank as Paratexanites rex. In the present specimen the umbilical tubercles areradially elongated as in the latter species, but the whorl section is not ascompressed. For the present it is considered best to refer to the available specimen asP. sp. aff. P. emscheris. Occurrence Coniacian IV of Zululand. Genus Plesiotexanites Matsumoto, 1970 Type species Mortoniceras kawasakii Kawada, 1929, by the original designation ofMatsumoto (1970: 267). Diagnosis The inner whorls remain trituberculate (1,3+4,5) for a considerable the ventrolateral (3+4) node, which may be very large, divides intotwo distinct tubercles, submarginal (3) and marginal (4). Simultaneously, orlater, a lateral (2) tubercle appears. Tubercles (3) and (4) may remain closetogether, or separate completely, giving rise to normal Texanites ornament. 64 ANNALS OF THE SOUTH AFRICAN MUSEUM.
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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectnaturalhistory
