. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CRETACEOUS TRIGONIIDAE FROM THE BRENTON FORMATION 53. Fig. 4. lotrigonia stowi (Kitchin). The holotype, after Kitchin (1908). x 1. Subfamily Pterotrigoniinae van Hoepen, 1929 Genus Pterotrigonia van Hoepen, 1929 Type species Pterotrigonia cristata van Hoepen, 1929 Discussion Nakano (1974) considers the subfamily Pterotrigoniinae to include the following taxa: Pterotrigonia {Pterotrigonia), P. (Rinetrigonia), Scabrotrigonia, Acanthotrigonia (Acanthotrigonia) and A. (Metacanthotrigonia). However, withi
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CRETACEOUS TRIGONIIDAE FROM THE BRENTON FORMATION 53. Fig. 4. lotrigonia stowi (Kitchin). The holotype, after Kitchin (1908). x 1. Subfamily Pterotrigoniinae van Hoepen, 1929 Genus Pterotrigonia van Hoepen, 1929 Type species Pterotrigonia cristata van Hoepen, 1929 Discussion Nakano (1974) considers the subfamily Pterotrigoniinae to include the following taxa: Pterotrigonia {Pterotrigonia), P. (Rinetrigonia), Scabrotrigonia, Acanthotrigonia (Acanthotrigonia) and A. (Metacanthotrigonia). However, within contemporaneous species populations there are intermediates between Pterotrigonia and Rinetrigonia and between Acanthotrigonia and Scabrotrigonia. Moreover, it is frequently difficult to place a species within any one of these genera/subgenera, and subsequently the author prefers to follow Cox (1969) in recognizing only P. (Pterotrigonia) and P. (Scabrotrigonia), to which may now possibly be added P. (Metacanthotrigonia). Pterotrigonia (Pterotrigonia) etheridgei kitchini (Schwarz) Fig. 5 Trigonia rogersi Rogers (non Kitchin), 1909: 130. Trigonia kitchini Schwarz, 1915: 120, pi. 4 (figs 2-4). Pringle, 1960: 89. non Trigonia kitchini Stoyanow, 1949: 82, pi. 14 (figs 4-10). Material The holotype, AM 3884, and a topotype example, SAM-D3067, are the only known specimens. Both retain recrystallized test and their preservation suggests that they may be from unit II at Brenton. , Description ^—^ The holotype shell is strongly inflated anteriorly and rostrate posteriorly. The umbones are strongly incurved and situated very close to the anterior face of the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original South African Museum. Cape Town : The Museum
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