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Williamsonia
Taxonomy
Williamsonia was named by Carruthers (1870). It is not extant.
It was assigned to Cycadaceae by Knowlton (1919); and to Bennettitales by Lakhanpal et al. (1976), Chandra and Tewari (1991), Watson and Sincock (1992).
It was assigned to Cycadaceae by Knowlton (1919); and to Bennettitales by Lakhanpal et al. (1976), Chandra and Tewari (1991), Watson and Sincock (1992).
Species
W. amarjolense, W. blanfordii, W. campanulatiformis, W. delawarensis, W. elocata, W. gallinacea, W. gigas, W. guptae, W. harrisiana, W. indica, W. kakadbhitensis (syn. Carnoconites laxum, Strobilites pascoei), W. marylandica, W. microps, W. oregonensis, W. phoenicopsoides, W. recentior, W. riesii, W. sahnii, W. santalensis, W. seniana, W. sewardiana, W. smockii, W. sukhpurensis, W. texana, W. trambauensis, W. virginiensis
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1870 | Williamsonia Carruthers pp. 680, 691 |
| 1919 | Williamsonia Knowlton |
| 1976 | Williamsonia Lakhanpal et al. |
| 1991 | Williamsonia Chandra and Tewari |
| 1992 | Williamsonia Watson and Sincock |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
G. †Williamsonia Carruthers 1870
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†Williamsonia amarjolense Sharma 1968
†Williamsonia blanfordii Feistmantel 1876
†Williamsonia campanulatiformis Sharma 1969
†Williamsonia delawarensis Berry 1907
†Williamsonia elocata Lesquereux 1891
†Williamsonia gallinacea Ward 1905
†Williamsonia gigas Lindley and Hutton 1831
†Williamsonia guptae Sharma 1968
†Williamsonia harrisiana Bose 1968
†Williamsonia indica Seward 1917
†Williamsonia kakadbhitensis Bose and Banerji 1984
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Invalid names: Carnoconites laxum Srivastava 1946 [replaced], Strobilites pascoei Sahni 1928 [replaced]
†Williamsonia marylandica Berry 1914
†Williamsonia microps Feistmantel 1877
†Williamsonia oregonensis Fontaine 1905
†Williamsonia phoenicopsoides Ward 1899
†Williamsonia recentior Dawson 1885
†Williamsonia riesii Hollick 1892
†Williamsonia sahnii Gupta 1943
†Williamsonia santalensis Sitholey and Bose 1953
†Williamsonia seniana Bose and Kasat 1969
†Williamsonia sewardiana Sahni 1932
†Williamsonia smockii Newberry 1895
†Williamsonia sukhpurensis Bose and Banerji 1984
†Williamsonia texana Fontaine 1893
†Williamsonia trambauensis Bose and Banerji 1984
†Williamsonia virginiensis Fontaine 1889
Diagnosis
No diagnoses are available
Measurements
No measurements are available
No ecological data are available
Age range: base of the Anisian to the top of the Early/Lower Albian or 246.70000 to 110.10000 Ma
Collections (86 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Anisian | Russian Federation | W. sp. 1 (30546) | |
| Middle Triassic | Antarctica | W. sp. 1 (29349) | |
| Carnian | Mexico (Sonora) | W. sp. (24032 24036 24037 24061 24092) | |
| Carnian | USA (North Carolina) | W. sp. (24499 24601) | |
| Carnian - Rhaetian | Russian Federation | W. sp. 1 (30830) | |
| Norian | USA (New Mexico) | W. nizhonii (23968) | |
| Hettangian - Sinemurian | Romania | W. sp. (31097) | |
| Early/Lower Jurassic | Iran | W. sp. 1 (30184) | |
| Early/Lower Jurassic | Romania | W. latecostata (31144) | |
| Early/Lower Jurassic | Antarctica | W. sp. 1 (29347) | |
| Pliensbachian - Toarcian | Russian Federation | W. sp. 1 (30438) | |
| Pliensbachian - Toarcian | Tajikistan | W. sp. 1 (30901) | |
| Toarcian | Russian Federation | W. sp. 1 (30390) W. sp. 1, W. sp. 2 (30601) | |
| Aalenian | Tajikistan | W. sp. 1 (30916) | |
| Aalenian | United Kingdom | W. gigas (35121) W. hildae (35120) | |
| Aalenian | United Kingdom (North Yorkshire) | W. hildae, W. leckenbyi (165588) | |
| Aalenian - Bajocian | Uzbekistan | W. sp. 1 (30970) | |
| Aalenian - Bajocian | Russian Federation | W. sp. 1 (30453) | |
| Aalenian - Bajocian | Tajikistan | W. sp. 1 (30915) | |
| Middle Jurassic | Mexico (Puebla) | W. netzahualcoyotlii (24681) | |
| Middle Jurassic | Russian Federation | W. sp. 1, W. sp. 2 (30609) | |
| Middle Jurassic | Mexico (Oaxaca) | W. cuauhtemoci, W. huitzilopochtlii, W. nathorstii, W. netzahualcoyotlii, W. sp. (24725) W. nathorstii, W. netzahualcoyotlii (24678) W. netzahualcoyotlii (24679 24726) | |
| Middle Jurassic | Argentina (Chubut) | W. sp. 1 (29373) | |
| Middle Jurassic | Kazakhstan | W. sp. 1 (30229) | |
| Middle Jurassic | Afghanistan | W. sp. 1 (29338) | |
| Middle Jurassic | Japan (Yamaguchi) | W. sp. 1 (30208) | |
| Middle Jurassic | Israel (Negev) | W. sp. 1 (30197) | |
| Middle Jurassic | Mexico (Guerrero) | W. cuauhtemoci (24734) | |
| Middle Jurassic | China (Liaoning) | W. sp. 1 (29819) | |
| Middle Jurassic | Argentina (Neuquen) | W. sp. 1 (29388) | |
| Middle Jurassic | Iran | W. sp. 1 (30185) | |
| Middle Jurassic - Late/Upper Jurassic | India | W. sp. 1, W. sp. 2, W. sp. 3, W. sp. 4 (30127) | |
| Middle Jurassic - Late/Upper Jurassic | Australia (Queensland) | W. sp. 1 (29446) | |
| Early/Lower Bajocian | Mexico (Oaxaca) | W. cuauhtemoci, W. diquiyui, W. huitzilopochtlii, W. netzahualcoyotlii, W. oaxacensis (24729) | |
| Bajocian | United Kingdom | W. coronata, W. leckenbyi (35122) | |
| Bajocian | Mexico (Oaxaca) | W. netzahualcoyotlii, W. huitizilipochtlii, W. oaxacensis, W. diquiyui (25087) | |
| Bajocian | United Kingdom (England) | W. hildae (24344) | |
| Bajocian - Middle Jurassic | United Kingdom (England) | W. gigas (24212) | |
| Bathonian | Russian Federation | W. sp. 1 (30773) | |
| Bathonian | Georgia | W. sp. 1 (30108) | |
| Bathonian | Uzbekistan | W. sp. 1 (30971) | |
| Bathonian - Callovian | Ukraine | W. sp. 1, W. sp. 2 (30961) | |
| Callovian | France | W. pictaviensis (24395) | |
| Middle Oxfordian | France | W. pictaviensis, W. sp. (24421) | |
| Late/Upper Jurassic | India (Jharkhand) | Carnoconites laxum, W. santalensis (224607) Strobilites pascoei (224876) W. indica, W. sahnii (224762) W. scotica, W. sp., W. sewardiana, W. amarjolense, W. guptae, W. harrisiana (224719) W. setosa, W. sp., W. gigas, W. indica (224686) W. sp. (224718 224760) W. sp., W. campanulatiformis (225504) | |
| Late/Upper Jurassic | China (Heilongjiang) | W. sp. 1 (29947) | |
| Late/Upper Jurassic | India (Rajasthan) | W. sewardiana, Carnoconites laxum (30133) | |
| Late/Upper Jurassic | Japan (Miyagi) | W. sp. 1 (30198) | |
| Late/Upper Jurassic | India (Gujarat) | W. kakadbhitensis (229215) | |
| Late/Upper Jurassic | Kazakhstan | W. sp. 1 (30231) | |
| Late/Upper Jurassic | India (Andhra Pradesh) | W. indica (224645) | |
| Late/Upper Jurassic - Early/Lower Cretaceous | India (Gujarat) | W. blanfordii, W. kakadbhitensis (226874) W. kakadbhitensis (224625) | |
| Late/Upper Jurassic - Early/Lower Cretaceous | India (Madhya Pradesh) | W. gigas, W. seniana (224642) | |
| Kimmeridgian | France | W. feneonis (24440) | |
| Kimmeridgian | United Kingdom (Scotland) | W. sp. (24393 31060 31209) | |
| Kimmeridgian - Early/Lower Tithonian | Antarctica | W. sp. (36767) | |
| Late/Upper Kimmeridgian | France | W. sp. A, W. sp. B (24422) W. sp. A, W. sp. B, W. feneonis (24434) | |
| Late/Upper Kimmeridgian | Germany (Baden-Württemberg) | W. sp. (154138) | |
| Tithonian | France | W. gagnierei (24516) | |
| Early/Lower Cretaceous | India (Gujarat) | W. blanfordii (32381) W. sukhpurensis (32382) | |
| Cretaceous | USA (Wyoming) | W. phoenicopsoides (32047) | |
| Late/Upper Barremian | Spain (Castilla-La Mancha) | W. sp. (28006) | |
| Late/Upper Aptian - Early/Lower Albian | India (Gujarat) | W. trambauensis (32378) | |
| Albian | Canada (Alberta) | W. recentior (24839) |