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Weddellonectia
Taxonomy
Weddellonectia was named by O'Gorman and Coria (2017) [‘Weddello’ after the Weddell Province, from which most of the taxa have been collected and ‘nectia’ for ‘nectes’ (swimmer).].
It was assigned to Plesiosauroidea by O'Gorman et al. (2019); to Euelasmosaurida by O'Gorman (2019); and to Elasmosauridae by O'Gorman and Coria (2017), O'Gorman et al. (2018), O'Gorman et al. (2018), O'Gorman et al. (2021), O'Gorman et al. (2021), O'Gorman (2021) and O’Gorman et al. (2024).
It was assigned to Plesiosauroidea by O'Gorman et al. (2019); to Euelasmosaurida by O'Gorman (2019); and to Elasmosauridae by O'Gorman and Coria (2017), O'Gorman et al. (2018), O'Gorman et al. (2018), O'Gorman et al. (2021), O'Gorman et al. (2021), O'Gorman (2021) and O’Gorman et al. (2024).
Synonymy list
Year | Name and author |
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2017 | Weddellonectia O'Gorman and Coria p. 241 |
2018 | Weddellonectia O'Gorman et al. p. 250 |
2018 | Weddellonectia O'Gorman et al. |
2019 | Weddellonectia O'Gorman |
2019 | Weddellonectia O'Gorman et al. p. 215 |
2021 | Weddellonectia O'Gorman |
2021 | Weddellonectia O'Gorman et al. |
2021 | Weddellonectia O'Gorman et al. |
2024 | Weddellonectia O’Gorman et al. p. 4 |
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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.
Unr. †Weddellonectia O'Gorman and Coria 2017
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Subfm. †Aristonectinae Otero et al. 2012
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G. †Aristonectes Cabrera 1941
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†Aristonectes parvidens Cabrera 1941
†Aristonectes quiriquinensis Otero et al. 2014
Invalid names: Turneria Chatterjee and Small 1989 [synonym]
G. †Morturneria Chatterjee and Creisler 1994
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†Morturneria seymourensis Chatterjee and Creisler 1994
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Invalid names: Turneria seymourensis Chatterjee and Small 1989 [replaced]
Invalid names: Mauisaurus Hector 1874 [nomen dubium], Mauisaurus haasti Hector 1874 [nomen dubium], Tuarangisaurus cabazai Gasparini et al. 2003 [nomen dubium]
Diagnosis
Reference | Diagnosis | |
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J. P. O'Gorman and R. A. Coria 2017 | Elasmosaurids with two distinctive humeral synapomorphies: a postaxial accessory ossicle articulating with the humerus (indicated by a posterior accessory articular facet in the humerus), and a 180º angle between epipodial facets in dorsal view (also shared by the poorly known lower Albian Wapuskanectes betsinicollsae). Additional features that characterize Weddellonectia (although convergently shared by other elasmosaurids) are: cervical vertebrae wider than long; less than 56 cervical vertebrae; pectoral bar absent; an angled ilium shaft; femora with long and dorsally expanded trochanter (absent in K. lafquenianum); and a hemispherical head (absent in K. lafquenianum and V. molyi). | |
J. P. O'Gorman et al. 2019 | Elasmosaurids with two distinctive humeral synapomorphies: a postaxial accessory ossicle articulating with the humerus (indicated by a posterior accesso ry
articular facet in the humerus, also shared by the poorly known lower Albian Wapuskanectes betsynichollsae ), and a 180º angle between epipodial facets in dorsal view. Additional features that characterize Weddellonectia (although convergently shared by other elasmosaurids) are: cervical vertebrae wider than long; fewer than 56 cervical vertebrae; pectoral bar absent; an angled ilium shaft; femora with long and dorsally expanded trochanter (absent in K .lafquenianum ); and a hemispherical capitulum (absent in K .lafquenianum and V . molyi |
Measurements
No measurements are available
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Source: o = order | |||||
Reference: Kiessling 2004 |
Age range: base of the Campanian to the top of the Late/Upper Maastrichtian or 83.60000 to 66.00000 Ma
Collections (49 total)
Time interval | Ma | Country or state | Original ID and collection number |
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Early/Lower Santonian | Japan (Fukushima) | Futabasaurus suzukii (98850) | |
Piripauan | New Zealand | Mauisaurus haasti (83537) | |
Campanian | New Zealand (South Island) | Mauisaurus haasti (37089 232395 232397) | |
Haumurian | New Zealand (South Island) | Kaiwhekea katiki (104692) | |
Haumurian | New Zealand (Canterbury) | Elasmosauridae indet. (155319) Mauisaurus haastii (101408 101409) | |
Late/Upper Campanian | Antarctica (James Ross Island) | Aristonectinae indet. (123285) | |
Late/Upper Campanian | New Zealand (South Island) | Mauisaurus haastii (231246) | |
Middle Campanian | New Zealand (South Island) | Mauisaurus haasti (97812) | |
Late/Upper Campanian - Early/Lower Maastrichtian | Argentina (Río Negro) | Trinacromerum lafquenianum (194129) | |
Late/Upper Campanian - Early/Lower Maastrichtian | New Zealand (Hawke's Bay) | Mauisaurus haasti (232253) Tuarangisaurus keyesi (27887 232250) | |
Late/Upper Campanian - Early/Lower Maastrichtian | New Zealand | Tuarangisaurus keyesi (208367) | |
Late/Upper Campanian - Maastrichtian | Argentina (Río Negro) | Plesiosauria indet. (51583) | |
Maastrichtian | USA (California) | Morenosaurus stocki (76732 116613) | |
Maastrichtian | Argentina (Chubut) | Kawanectes lafquenianum (219277 219278 234156) | |
Maastrichtian | Antarctica (Seymour Island) | Aristonectes sp. (63513) | |
Early/Lower Maastrichtian | Antarctica | Vegasaurus molyi (141244) Weddellonectia indet. (232341) | |
Early/Lower Maastrichtian | Angola (Namibe) | Aristonectinae indet. (232402) Tuarangisaurus sp. (106705) | |
Late/Upper Maastrichtian | USA (California) | Plesiosauria indet. (76734) | |
Late/Upper Maastrichtian | Chile (Puerto Natales) | Aristonectes sp. (208356) Aristonectinae indet. (208357 208358) | |
Late/Upper Maastrichtian | New Zealand (South Island) | Mauisaurus haasti (232391 232392 232393 232401) | |
Late/Upper Maastrichtian | Argentina (Chubut) | Aristonectes parvidens (97872) | |
Late/Upper Maastrichtian | Chile | Aristonectinae indet. (157301 221030) Aristonectinae indet., Mauisaurus sp. (91416) | |
Late/Upper Maastrichtian | Antarctica | Aristonectes parvidens (140323) Aristonectes sp. (232357) Aristonectinae indet. (232334) Turneria seymourensis (13106) Weddellonectia indet. (51962 232333) | |
Late/Upper Maastrichtian | Antarctica (Seymour Island) | Marambionectes molinai (234352) | |
Late/Upper Maastrichtian | Chile (Biobio) | Aristonectes sp. (150921) | |
Late/Upper Maastrichtian | Chile (Concepción) | Aristonectes parvidens (118945) |