Pugnacoidea Rzhonsnitskaya, 1956
publication ID |
https://doi.org/ 10.5281/zenodo.13742176 |
persistent identifier |
https://treatment.plazi.org/id/4836037D-D66B-6C40-FFBF-D350FE7DF9E1 |
treatment provided by |
Felipe |
scientific name |
Pugnacoidea Rzhonsnitskaya, 1956 |
status |
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Superfamily Pugnacoidea Rzhonsnitskaya, 1956 View in CoL Family Pugnacidae Rzhonsnitskaya, 1956 Genus Pugnax Hall and Clarke, 1893
Pugnax cf. triplicata (Chen, 1978 in Xu et al. 1978) Fig. 4D View Fig .
1978 cf. Striatopugnax triplicata Chen (gen. et sp. nov.); Chen in Xu et al. 1978: 323, pl. 138: 2, 5, 8.
1984 cf. Striatopugnax triplicata Chen ; Chen 1984: 116–117, text−figs. 14–17, pl. 4: 6–15, pl. 15: 4.
Material.— Eight specimens, poorly preserved, from the Caiziyan section. Samples: GC24 (1 specimen) , GC23 (1 specimen) , GC20 (1 specimen) , GC19–30 (1 specimen) , GC21–24 (3 specimens) ,? GC8–9 (1 specimen) .
Discussion.—Chen (in Xu et al. 1978) established Striatopugnax with S. triplicata Chen, 1978 (in Xu et al. 1978) as the type species, characterized by its micro−ornament of radial striae. Savage et al. (2002: 1165) synonimized it with Pugnax .
Although the specimens studied herein are quite similar to Chen’s (1984) specimens of Pugnax triplicata (for example, short dental plates and 4 costae on fold; the left one on the studied specimen must be broken away judging from the shell contour), they differ by a much bigger size (approximately 18.7 mm wide, 16.9 mm long, and 12.6 mm thick for the figured specimen) from Chen’s (1984) figured specimens (around 12.5 mm wide and 8.5 mm thick); their greatest width is located slightly more anteriorly; their lateral flanks are smooth without costae. The studied specimens are externally also similar to Pugnax sp. cf. Pugnax pugnus described by Veevers (1959a: 110–113), except for their smaller size.
Occurrence.—The present species occurs in Beds 19–24 (and also?Middle Givetian beds 8–9) of the Caiziyan section, approximately Pa. transitans Zone.
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