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Kinosternon skullridgescens

Reptilia - Testudines - Kinosternoidea

Taxonomy
Kinosternon skullridgescens was named by Bourque (2012). Its type specimen is AMNH FAM9090, a partial skeleton, and it is a 3D body fossil. Its type locality is north of White Operation Wash, which is in a Barstovian terrestrial horizon in the Tesuque Formation of New Mexico.

Synonymy list
YearName and author
2012Kinosternon skullridgescens Bourque
2016Kinosternon skullridgescens Joyce and Bourque

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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
—Testudinata(Oppel 1811)
orderTestudinesBatsch 1788
suborderCryptodira
superfamilyTrionychoideaFitzinger 1826
familyKinosternoidea()
familyKinosternidae()
genusKinosternonvon Spix 1824
speciesskullridgescens

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.

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Diagnosis
ReferenceDiagnosis
Bourque 2012Skull relatively broad (∼22% carapace length in FAM 9090); rostrum blunt; prefrontal margin of the fossa nasalis broad and relatively squared; premaxillary beak slightly developed and pointed (shared with the extant flavescens group and K. pojoaque); orbital margin of the prefrontal and postorbital slightly flared upward (shared with the extant flavescens and subrubrum groups); distal protuberance of the processus trochlearis oticum on the dorsal quadrate well developed and highly inflected dorsolaterally (shared with Kinosternon herrerai); carapace smooth and acarinate; possession of six neurals; N1 contacts nuchal (shared with K. pojoaque and the flavescens and subrubrum groups); V1 very narrow, not contacting M2 (shared with the subrubrum group, K. herrerai, and Sternotherus); M9 much lower than M10 (not heightened as in K. pojoaque and the extant flavescens group); M11 lower than M10; M8–9 form narrow step that protrudes laterally from carapace (shared with K. herrerai and Sternotherus); M8–11 broadly underlap carapacial rim; plastral bridge buttresses flat to only slightly inclined and lacking or with faint inguinal grooves; plastral hindlobe narrow and elongate with a well-developed anal notch; lack of femoral-anal scute notch on outer margin of xiphiplastron.