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Weddellonectia

Reptilia - Plesiosauria - Elasmosauridae

Synonymy list
YearName and author
2017Weddellonectia O'Gorman and Coria p. 241
2018Weddellonectia O'Gorman et al. p. 250
2018Weddellonectia O'Gorman et al.
2019Weddellonectia O'Gorman
2019Weddellonectia O'Gorman et al. p. 215
2021Weddellonectia O'Gorman
2021Weddellonectia O'Gorman et al.
2021Weddellonectia O'Gorman et al.
2024Weddellonectia O’Gorman et al. p. 4

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
—Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
RankNameAuthor
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
—Sauropsida
classReptilia
subclassEureptilia()
—Romeriida
—Diapsida()
suborderSauropterygia
orderPlesiosauriade Blainville 1835
superfamilyPlesiosauroideaWelles 1943
familyElasmosauridaeCope 1869
—Weddellonectia
—Weddellonectia

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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G. †Aphrosaurus Welles 1943
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†Aphrosaurus furlongi Welles 1943
Subfm. †Aristonectinae Otero et al. 2012
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G. †Alexandronectes Otero et al. 2016
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†Alexandronectes zealandiensis Otero et al. 2016
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]
G. †Wunyelfia Otero and Soto-Acuña 2021
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†Wunyelfia maulensis Otero and Soto-Acuña 2021
Invalid names: Mauisaurus Hector 1874 [nomen dubium], Mauisaurus haasti Hector 1874 [nomen dubium], Tuarangisaurus cabazai Gasparini et al. 2003 [nomen dubium]
G. †Futabasaurus Sato et al. 2006
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†Futabasaurus suzukii Sato et al. 2006 [Futaba Suzuki Ryu]
G. †Kaiwhekea Cruickshank and Fordyce 2002
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†Kaiwhekea katiki Cruickshank and Fordyce 2002
G. †Kawanectes O'Gorman 2016
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†Kawanectes lafquenianum Gasparini and Goni 1985
G. †Marambionectes O’Gorman et al. 2024
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†Marambionectes molinai O’Gorman et al. 2024
G. †Morenosaurus Welles 1943
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†Morenosaurus stocki Welles 1943
G. †Tuarangisaurus Wiffen and Moisley 1986
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†Tuarangisaurus keyesi Wiffen and Moisley 1986
G. †Vegasaurus O'Gorman et al. 2015
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†Vegasaurus molyi O'Gorman et al. 2015
Diagnosis
ReferenceDiagnosis
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. 2019Elasmosaurids 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
Composition: hydroxyapatiteo
Environment: marineo
Locomotion: actively mobileo
Life habit: aquatico
Depth habitat: surfaceo
Diet: carnivoreo
Reproduction: viviparouso
Created: 2009-07-20 06:05:48
Modified: 2011-08-12 01:58:15
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
Early/Lower Santonian85.8 - 83.5Japan (Fukushima) Futabasaurus suzukii (98850)
Piripauan85.8 - 83.5New Zealand Mauisaurus haasti (83537)
Campanian83.6 - 72.1New Zealand (South Island) Mauisaurus haasti (37089 232395 232397)
Haumurian83.6 - 66.0New Zealand (South Island) Kaiwhekea katiki (104692)
Haumurian83.6 - 66.0New Zealand (Canterbury) Elasmosauridae indet. (155319) Mauisaurus haastii (101408 101409)
Late/Upper Campanian83.5 - 70.6Antarctica (James Ross Island) Aristonectinae indet. (123285)
Late/Upper Campanian83.5 - 70.6New Zealand (South Island) Mauisaurus haastii (231246)
Middle Campanian83.5 - 70.6New Zealand (South Island) Mauisaurus haasti (97812)
Late/Upper Campanian - Early/Lower Maastrichtian83.5 - 66.0Argentina (Río Negro) Trinacromerum lafquenianum (194129)
Late/Upper Campanian - Early/Lower Maastrichtian83.5 - 66.0New Zealand (Hawke's Bay) Mauisaurus haasti (232253) Tuarangisaurus keyesi (27887 232250)
Late/Upper Campanian - Early/Lower Maastrichtian83.5 - 66.0New Zealand Tuarangisaurus keyesi (208367)
Late/Upper Campanian - Maastrichtian83.5 - 66.0Argentina (Río Negro) Plesiosauria indet. (51583)
Maastrichtian72.1 - 66.0USA (California) Morenosaurus stocki (76732 116613)
Maastrichtian72.1 - 66.0Argentina (Chubut) Kawanectes lafquenianum (219277 219278 234156)
Maastrichtian72.1 - 66.0Antarctica (Seymour Island) Aristonectes sp. (63513)
Early/Lower Maastrichtian70.6 - 66.0Antarctica Vegasaurus molyi (141244) Weddellonectia indet. (232341)
Early/Lower Maastrichtian70.6 - 66.0Angola (Namibe) Aristonectinae indet. (232402) Tuarangisaurus sp. (106705)
Late/Upper Maastrichtian70.6 - 66.0USA (California) Plesiosauria indet. (76734)
Late/Upper Maastrichtian70.6 - 66.0Chile (Puerto Natales) Aristonectes sp. (208356) Aristonectinae indet. (208357 208358)
Late/Upper Maastrichtian70.6 - 66.0New Zealand (South Island) Mauisaurus haasti (232391 232392 232393 232401)
Late/Upper Maastrichtian70.6 - 66.0Argentina (Chubut) Aristonectes parvidens (97872)
Late/Upper Maastrichtian70.6 - 66.0Chile Aristonectinae indet. (157301 221030) Aristonectinae indet., Mauisaurus sp. (91416)
Late/Upper Maastrichtian70.6 - 66.0Antarctica Aristonectes parvidens (140323) Aristonectes sp. (232357) Aristonectinae indet. (232334) Turneria seymourensis (13106) Weddellonectia indet. (51962 232333)
Late/Upper Maastrichtian70.6 - 66.0Antarctica (Seymour Island) Marambionectes molinai (234352)
Late/Upper Maastrichtian70.6 - 66.0Chile (Biobio) Aristonectes sp. (150921)
Late/Upper Maastrichtian70.6 - 66.0Chile (Concepción) Aristonectes parvidens (118945)