Accueil du site > Equidae tridactyles (Hipparions sensu lato) > Northamerican archaic skulls and mandibles > Ratio diagrams, 8 variables
Skull proportions, excluding the size of the preorbital ‘bar’ (32) : Lakotahippus s.l.
lundi 31 mai 2010 par Véra Eisenmann
As the variation is the largest for measures of the fossa, especially its distance from the orbit (’bar’ : mesure 32), I have drawn separate ratio digrams for other dimensions : 5=post-palatal length ; 23=anterior ocular line ; 2=palatal length ; 1=muzzle length ; 15=maximal muzzle breadth ; 9=P2-M3 length ; 30=length of the naso-incisival notch ; 31=length of the cheek. The reference is the skull FAM 60300 of Lakotahippus (Tables 1 and 2 ).
Lakotahippus, Lakotahippus-like, and Group A-morph 9 skulls.
There are only two skulls (7269 from John Day, referred to Kalobatippus ; and 10828, referred to Protohippus or Neohipparion) that somehow resemble the reference Lakotahippus 60300 from Ash Hollow (Lakotalike). All other have much shorter naso-incisival notches and/or longer cheeks ; they evidently belong to Group A. They form the morph 9 of Group A (A-9).
Documents joints
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RD Lakotahippus-like skulls (Excel - 43 ko)
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RD Group A-9 skulls (Excel - 52.5 ko)
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Equidae tridactyles (Hipparions sensu lato)
Northamerican archaic skulls and mandibles
Ratio diagrams, 8 variables
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