TABLE 1. Skull measures in mm. No data (-), maximum preserved (*), approximate measure (~).

  Tlaxcallicetus sp. Tlaxcallicetus guaycurae

Cranium

   
Anteroposterior length *200 *270
Greatest anteroposterior length the exoccipital - 91.6
Anteroposterior length of the zygomatic process of the squamosal - *150
Byzigomatic width - ~750
Greatest transverse width of the supraoccipital - ~370
Transverse width of exoccipitals - ~248
Greatest Transverse width of occipital condyles ~125 126
Height of foramen magnum 45 40.2
Transverse width of foramen magnum ~47 ~35.2
Width of upper intercondyloid notch ~49.72 43.1
Width of low intercondyloid notch ~26.1 21
Transverse width of basioccipital crest, at its middle lenght 26.68 34.9
Transverse width across basioccipital crest ~64.2 ~90.3
Diameter of glenoid fossa (anterolateral-posteromedial axis) - 139.5
Diameter of glenoid fossa (posterolateral-anteromedial axis) - 118.6

 

 

TABLE 2. Measurements in mm of ear bones. No data (-), maximum preserved (*), approximate measure (~), not clear (?).

  Tlaxcallicetus sp. Tlaxcallicetus guaycurae

Left bulla

   
Anteroposterior length *54.3 -
Greatest transverse width 44.7 -
Dorsoventral depth of involucrum, at anterior level to inner posterior pedicle 27.8 -
Transversal thickness of involucrum across the anterior point of the base of the inner posterior pedicle 28 -
Anteroposterior length of the tympanic cavity *42.4 -
Greatest transverse width of inner posterior prominence/medial lobe ~22.9 -
Greatest transverse width of outer posterior prominence/lateral lobe ~20 -
     

Left periotic

   
Greatest anteroposterior length *54 ~76.42
Anteroposterior length of the suprameatal area 7.2 -
Greatest anteroposterior length of anterior process, from anterior incisures to anterior keel 22.78 ~20.7
Greatest length of the posterior process - ~60.8
Maximum anteroposterior length of pars cochlearis *28.74 ~29.36
Greatest length of internal acoustic meatus 16.2 -
Greatest length of aperture for the cochlear aqueduct ~3.5 ~2.5
Greatest length of aperture for the vestibular aqueduct 7.68 -
Greatest length of proximal opening of the facial canal ~4 -
Greatest length of dorsal vestibular area 8.2 -
Greatest length of fenestra rotunda - ~2.4
Greatest length of fenestra ovalis - -
Greatest length of mallear fossa - ?
Greatest length of distal opening of the facial canal - 6.4
Greatest length of stapedial muscle fossa - ?
Transverse width of base of anterior process - 10.5
Transverse width of pars cochlearis 17 ?
Transverse width of the posterior process (anteroposterior plan) - 17
Maximum transverse width of suprameatal area 10 -
Maximum transverse width of periotic, from the medial face of pars cochlearis to lateral wall of the periotic body ~30.9 ?
Dorsoventral depth of anterior process *55 *41.3

 

 

TABLE 3. Measurements in mm of left thyrohyoid bone. No data (-).

  Tlaxcallicetus sp. Tlaxcallicetus guaycurae
Length 73 -
Width at middle 26.4 -
Thickness at middle 22.7 -