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Thalattosaurus alexandrae

Reptilia - Thalattosauria

Taxonomy
Thalattosaurus alexandrae was named by Merriam (1904). Its type specimen is UCMP 9085, a partial skeleton (Preorbital part of skull, incomplete left and right dentary, right pterygoid, humerus, coracoid, pubis, isolated limb bones, six sections of articulated vertebr), and it is a 3D body fossil. Its type locality is UCMP 1013, West end of Bear Cove, which is in a Tuvalian carbonate limestone in the Hosselkus Formation of California. It is the type species of Thalattosaurus.

Synonymy list
YearName and author
1904Thalattosaurus alexandrae Merriam p. 419 fig. 1
1905Thalattosaurus alexandrae Merriam p. 34 figs. plates 1,2,4,5,6,7,8
1930Thalattosaurus alexandrae Hay p. 241
1999Thalattosaurus alexandrae Nicholls p. 2 figs. 1-15

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
—Eugnathostomata
—Teleostomi(Bonaparte 1836)
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
RankNameAuthor
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
—Sauropsida
classReptilia
subclassEureptilia()
—Romeriida
—Diapsida()
—Thalattosauriformes
orderThalattosauria
superfamilyThalattosauroideaNopcsa 1928
genusThalattosaurus
speciesalexandrae

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.

†Thalattosaurus alexandrae Merriam 1904
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Diagnosis
ReferenceDiagnosis
E. L. Nicholls 1999Surface of premaxilla and dentary unornamented; "pseudodont" bony projections on pre- maxilla evenly spaced and sloping posteriorly; low crowned, button-like teeth on the vomer; mandibular button-like teeth off-set on lingual side of mandible.
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: marineo
Locomotion: actively mobilep
Created: 2017-04-17 10:38:24
Modified: 2017-04-17 10:38:24
Source: o = order, subp = subphylum, p = phylum
References: Kiessling 2004, Bush and Bambach 2015, Carroll 1988

Age range: Tuvalian or 233.60000 to 227.30000 Ma

Collections: one only


Time interval Ma Country or state Original ID and collection number
Tuvalian233.6 - 227.3USA (California) Thalattosaurus alexandrae (type locality: 136682)