Parent taxon: Bennettitales according to J. Watson and C. A. Sincock 1992
See also Chandra and Tewari 1991, Knowlton 1919 and Lakhanpal et al. 1976
Sister taxa: Amarjolia, Anomozamites, Bennetticarpus, Bennettistemon, Bennettitaceae, Bennettitaepollenites, Bennettiteaepollenites, Bennettitolepis, Bysmatospermum, Coreanophyllum, Cycadeospermum, Cycadolepis, Dictyozamites, Guptioxylon, Leguminanthus, Lerouxia, Moltenia, Monanthesia, Nilssoniopteris, Ontheanthus, Ontheostrobus, Otozamites, Palaeanthus, Piroconites, Pseudocycas, Pterophyllum, Ptilophyllum, Purioxylon, Rajmahalia, Sahnioxylon, Sturiella, Tyrmia, Tysonia, Vardekloeftia, Weltrichia, Wielandiella, Williamsoniaceae, Williamsonianthus, Williamsoniella, Wonnacottia, Zamites
Subtaxa: Williamsonia amarjolense Williamsonia blanfordii Williamsonia campanulatiformis Williamsonia delawarensis Williamsonia elocata Williamsonia gallinacea Williamsonia gigas Williamsonia guptae Williamsonia harrisiana Williamsonia indica Williamsonia kakadbhitensis Williamsonia marylandica Williamsonia microps Williamsonia oregonensis Williamsonia phoenicopsoides Williamsonia recentior Williamsonia riesii Williamsonia sahnii Williamsonia santalensis Williamsonia seniana Williamsonia sewardiana Williamsonia smockii Williamsonia sukhpurensis Williamsonia texana Williamsonia trambauensis Williamsonia virginiensis
Distribution:
• Cretaceous of Canada (1: Alberta collection), India (3), Spain (1), United States (1: Wyoming)
• Jurassic to Cretaceous of India (3)
• Jurassic of Afghanistan (1), Antarctica (2), Argentina (2), Australia (1), China (2), France (6), Georgia (1), Germany (1), India (12), Iran (2), Israel (1), Japan (2), Kazakhstan (2), Mexico (8), Romania (2), the Russian Federation (6), Tajikistan (3), Ukraine (1), the United Kingdom (9), Uzbekistan (2)
• Triassic of Antarctica (1), Mexico (5), the Russian Federation (2), United States (3: New Mexico, North Carolina)
Total: 86 collections including 124 occurrences
Specimen images are retrieved through the ePANDDA API.
Click image to enlarge. Click to access iDigBio record.