Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . B Fig. 182. Texanites soutoni natalense ssp. nov. Juvenile paratype SAS-Z1146 with much attenuated ornament, x 1. species described from Madagascar is known to occur definitely in NorthAmerica and vice versa. This causes one to think that Submortoniceras is eitherrestricted to certain geographic areas with Httle or no intermingling betweenthe populations, but highly successful and populous as far as number of speciesare concerned, or it is an extremely successful group with limited speciationpotential but wide dispers
Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . B Fig. 182. Texanites soutoni natalense ssp. nov. Juvenile paratype SAS-Z1146 with much attenuated ornament, x 1. species described from Madagascar is known to occur definitely in NorthAmerica and vice versa. This causes one to think that Submortoniceras is eitherrestricted to certain geographic areas with Httle or no intermingling betweenthe populations, but highly successful and populous as far as number of speciesare concerned, or it is an extremely successful group with limited speciationpotential but wide dispersion and tremendous intraspecific variation. Analysisof the South African material and work by Matsumoto (1959) seem to suggestthe latter. In his examination of S. chicoense, Matsumoto (1959) was able torecognize three morphological variants, forma a, j3 and y, which, by traditionalsystematic procedure, would probably qualify for separate specific rank. Hefound, however, that there was a continuous gradation from one form to theother, and that the different types may even
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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectnaturalhistory
