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Leptopleuron lacertinum

Reptilia - Procolophonidae

Taxonomy
Leptopleuron lacertinum was named by Owen (1851). Its type specimen is NMS 1891.92.528, a skeleton (Part and counterpart sandstone slabs, preserving the natural mould of a partial skull and most of the postcrania of a small, juvenile individual), and it is a mold. It is the type species of Leptopleuron.

Synonyms
Synonymy list
YearName and author
1851Leptopleuron lacertinum Owen p. 284
1852Telerpeton elginense Mantell p. 100 figs. Pl. 4
1856Telerpeton elginense Roemer p. 785
1861Leptopleuron lacertinum Owen p. 284
1939Telerpeton elginense Huene p. 508
1946Leptopleuron lacertinum Colbert p. 258
2010Leptopleuron lacertinum Saila p. 3

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
RankNameAuthor
Batrachosauria()
Cotylosauria()
Amniota
Sauropsida
classReptilia
subclassParareptilia
Procolophonomorpha()
Procolophonia()
superfamilyProcolophonoidea
familyProcolophonidae
subfamilyLeptopleuroninaeIvakhnenko 1979
genusLeptopleuronOwen 1851
specieslacertinumOwen 1851

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
L. K. Saila 2010Small procolophonid reptile, reaching 270 mm in snout-tail length in (sub)adults. Within Procolophonoidea, Leptopleuron is characterised by the following unique autapomorphies: vomerine dentition consisting of a tall and a short pair of fangs; frontals narrow anterior to the orbitotemporal openings; V-shaped groove on the jugal; anterior tip of the jugal in contact with the posterolateral extension of the nasal; minimal contact between the jugal and the postorbital; two
flattened, triangular spines of equal size on the quadratojugal; occipital condyle strongly tripartite; metotic foramen not surrounded by bone; ascending process of basisphenoid foreshortened, forming a robust flat ended expansion, and with lateral lamella; processus infrastapedialis columella aligned with long axis of footplate; loss of foramen for nerve IX on ventral ramus of the opisthotic; posterior opening of vidian canal behind the basipterygoid process; facial nerve foramen not enclosed by the prootic; transverse process of prootic rests on the dorsal surface of the opisthotic paraoccipital process; basal tubera of basioccipital covered ventrally by basal tubera of basiphenoid; broad medial ridge of pleurocentra of the dorsal vertebrae divided into three separate ridges by two deep grooves on each pleurocentrum; distinct three-fold depression pattern on the ventral side of ischium; fifth pedal digit has only two phalanges, with proximal phalanx equal in length to two proximal phalanges of digit four.