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Libysiren

Mammalia - Protosirenidae

Synonymy list
YearName and author
2017Libysiren Domning et al. pp. e1299158-2 figs. Figs. 1-15

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
RankNameAuthor
Cotylosauria()
Amniota
Synapsida()
Therapsida()
infraorderCynodontia()
Epicynodontia
infraorderEucynodontia
Probainognathia
Mammaliamorpha
Mammaliaformes
classMammalia
Pansirenia
Sirenia()
familyProtosirenidae
genusLibysiren

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
D. P. Domning et al. 2017Libysiren sickenbergi is a protosirenid sirenian distinguished from Ashokia antiqua by having a processus retro- versus on the squamosal [c. 77(1)], a zygomatic process that is dorsoventrally broader anteriorly [c. 81(1)], and a skull roof not narrowed at the frontoparietal suture, and by loss of premaxilla- frontal contact [c. 9(2); not lost in A. antiqua, as erroneously stated by Bajpai et al., 2009:259], lacking these derived features seen in A. antiqua: elevated zygomatic-orbital bridge [c. 11(1)], downward-elongated posttympanic process [c. 73(2)], prominent sigmoid ridge [c. 74(2)], wider external auditory meatus [c. 82 (1)], and a horizontal ridge along the ventral side of the mastoid foramen. Libysiren sickenbergi is distinguished from Protosiren fraasi by c. 9(2), by having the lacrimal inserted between the pre- maxilla and frontal [c. 93(2)], and by having an elongate midsec- tion of the jugal, while lacking reduction of the nasals [c. 32(1)]. It additionally differs from the later and more derived species P. smithae by having a processus retroversus [c. 77(1); variable in P. fraasi], while lacking separation of the nasals [c. 31(1)] and exoccipitals [c. 66(1)], a horizontal ramus not tangent to the man- dibular angle [c. 129(1)], and an enlarged tusk [c. 140(2)]. Libysi- ren sickenbergi is autapomorphic in displaying the correlated characters 9(2) and 93(2), which are otherwise seen only (and incompletely) in the dugongine Rytiodus heali.