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Notosphenos finisterre

Reptilia - Rhynchocephalia - Sphenodontidae

Taxonomy
Notosphenos finisterre was named by Agnolín et al. (2024). Its type specimen is MPM-PV-23097, a maxilla (Incomplete right maxilla preserving two complete and one partial teeth), and it is a 3D body fossil. Its type locality is Monotreme site, which is in a Maastrichtian terrestrial horizon in the Chorrillo Formation of Argentina. It is the type species of Notosphenos.

Synonymy list
YearName and author
2024Notosphenos finisterre Agnolín et al. p. 2 fig. 2

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
—Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
RankNameAuthor
—Amniota
—Sauropsida
classReptilia
subclassEureptilia()
—Romeriida
—Diapsida()
—Eosuchia()
—Neodiapsida
—SauriaGauthier 1984
—Lepidosauromorpha(Benton 1983)
superorderLepidosauria()
orderRhynchocephalia
familySphenodontidaeCope 1871
subfamilySphenodontinaeCope 1871
genusNotosphenos
speciesfinisterre

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.

†Notosphenos finisterre Agnolín et al. 2024
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Diagnosis
ReferenceDiagnosis
F. Agnolín et al. 2024Small-sized sphenodontine diagnosable by the following combination of characters: labial surface of maxilla entirely straight (convex in Sphenodon) and lacking ornamentation or foramina, and lingual surface strongly convex (much less convex to straight in Sphenodon). Teeth relatively low, with narrow base, smooth crown (ornamented in Lamarquesaurus), well-separated to each other (more imbricate in Sphenodon), and with thick enamel (thin enamel in Sphenodon). Caniniform having a posterolingual flange (absent in Sphenodon) and extensive lingual wear facet (absent in Sphenodon and sphenodontine MACN-PV RN 1062; Apesteguía and Jones 2012).
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: terrestrialsubc
Locomotion: actively mobilec
Created: 2017-04-17 15:16:03
Modified: 2017-04-17 15:16:03
Source: subc = subclass, c = class, subp = subphylum
References: Hendy et al. 2009, Carroll 1988

Age range: Early/Lower Maastrichtian or 70.60000 to 66.00000 Ma

Collections: one only


Time interval Ma Country or state Original ID and collection number
Early/Lower Maastrichtian70.6 - 66.0Argentina (Santa Cruz) Notosphenos finisterre (type locality: 234712)