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TABLE 1. Measurements in mm of the skull, cf. Miobalaenoptera numataensis (YPM 11851). Measurements are rounded to the nearest 0.5 mm.

  mm
Total length as preserved  516.0
Breadth across exoccipitals  620.0
Maximum width as preserved  807.0
Length of supraoccipital  516.0
Foramen magnum width  79.0
Foramen magnum height  91.0
Maximum width of occpital condyles  174.0

 

 

TABLE 2. Measurements in mm of the periotic, cf. Miobalaenoptera numataensis (YPM 11851). Measurements are rounded to the nearest 0.5 mm.

  mm
length of anterior process, from anteroventral angle to anterior incisure 46.0
length of pars cochlearis, from anterior incisure to posterior margin around the aperture for the cochlear aqueduct of pars cochlearis 50.0
posterior process mediolateral width 190.5
maximum anteroposterior length of posterior process 52.0

 

 

TABLE 3. Morphological differences between Miobalaenoptera numataensis (NFL 18) and cf. M. numataensis (YPM 11851).

  YPM 11851
Referred
NFL 18
Holotype
basioccipital crest dorsoventrally deeper shallower
area between basioccipital crests narrower wider
ventral surface of anteromedial portion of squamosal excavated flat
anterior process dorsoventrally deeper shallower
shape of the anterior process wider narrower
lateral tuberosity location more posterior anterior
anteroexternal sulcus more posterior anterior
pars cochlearis dorsoventrally thicker thinner
medial margin of pars cochlearis in ventral view sigmoidal straight

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