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Halisaurus arambourgi

Reptilia - Squamata - Mosasauridae

Taxonomy
Halisaurus arambourgi was named by Bardet et al. (2005). Its type specimen is MNHN PMC 14, a partial skeleton (Incomplete skeleton including a disarticulated skull and 27 associated articulated vertebrae (seven cervicals, 18 dorsals, two distal caudals)), and it is a 3D body fossil. Its type locality is Halisaurus arambourgi type, which is in a Maastrichtian marine phosphorite/marl in Morocco.

Synonymy list
YearName and author
2005Halisaurus arambourgi Bardet et al. p. 449
2012Halisaurus arambourgi Polcyn et al.

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
RankNameAuthor
Sauropsida
classReptilia
subclassEureptilia()
Romeriida
Diapsida()
Eosuchia()
Neodiapsida
SauriaGauthier 1984
Lepidosauromorpha(Benton 1983)
superorderLepidosauria()
orderSquamata
Episquamata
ToxicoferaVidal and Hedges 2005
superfamilyMosasauria(Marsh 1880)
familyMosasauridae
genusHalisaurusMarsh 1869
speciesarambourgi

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.

Diagnosis
ReferenceDiagnosis
N. Bardet et al. 2005Small mosasaurid (adult total length 3–4 m). External nares extend from 6th to 12th maxillary teeth, V-shaped anteriorly and U-shaped posteriorly; prefrontal contributes moderately to margin of naris and possesses small anterior supraorbital ridge; frontal with median dorsal ridge extending on two-thirds of the bone length, and two anterior oblique ridges; parietal with triangular table ornamented by transverse undulated ridges and a lenticular foramen, the anterior end of which is located half its length from the frontal suture; quadrate with a vertical oval stapedial notch; pterygoid with short palatine process at about 45 degrees relative to the ectopterygoid process; dental formula: 2 premaxillary, at least 16 maxillary and 12 pterygoid teeth, 19 dentary teeth; teeth very fine and sharp, abruptly posteriorly recurved, with a circular basal cross-section, two carinae and enamel ornamented by minute ridges; estimated vertebral formula: 7 cervicals, at least 20 dorsals and pygals, more than 29 median and 45 distal caudals; humerus length approximately 1.6 times distal width; femur length approximately 1.5 times distal width.