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TABLE 1. Tooth counts of relevant Tanystropheus specimens from Monte San Giorgio. Specimens assigned to the small morphotype are indicated by an asterisk. Abbreviations: ia, inapplicable; mx, maxilla; pmx, premaxilla.

  Pmx. tooth
count
Maxilla tooth
count
Mx.
position
first
tricuspid
How tricuspid Dentary position first tricuspid Pterygoid
tooth
count
Palatine
tooth
count
Vomer
tooth
count
PIMUZ T 2819 6 ? ia ia ia 0 ? ?
PIMUZ T 2790 6 15 ia ia ia 0 ? 15
PIMUZ T 2787 ? ? ia ia ia 0 0 12
PIMUZ T 2792 (cast of SNSB-BSPG 1953 XV 2) ? ? ia ia ? ? ? 5 or 6
PIMUZ T 2482* 6? ? 7 rather bulbous 12? ? 5 ?
PIMUZ T 2795* ? ? ? at least a bit ? around 12 at least 3 7
MSNM BES SC 265* 6 ? 4 or 5 distinctly around 7th ? ? present
MSNM BES SC 1018* 6 15 1st to 3rd distinctly around 5th 12 sensu Nosotti (2007) at least 3 at least 3
PIMUZ T 2484* ? 15 around 5th distinctly beyond 10th around 13 6 ?
PIMUZ T 2779* ? ? ? distinctly ? ? ? 10
PIMUZ T 3901* 6 ? 3 or 4 distinctly beyond 4th ? ? ?
PIMUZ T 1277* ? ? ? distinctly around 5th ? ? ?

 

 

TABLE 2. An overview of the morphological differences between the large and small morphotype identified among the Tanystropheus specimens from Monte San Giorgio.

  Large morphotype Small morphotype
Tricuspid marginal dentition Absent Present on the maxilla and dentary
Prenarial process of the premaxilla Absent or incipient Small but present
Postnarial process of the premaxilla Absent Long
Vomer Wide with dentition on the outer margin Narrow with a single straight tooth row
Pterygoid Edentulous and wide anteriorly Tooth bearing and tapering anteriorly
Palatine Edentulous and plate-like Tooth bearing and narrow
Parietal Long anterolateral and posterolateral processes and narrow in between these processes Wide with short anterolateral and posterolateral processes
Paroccipital process of the opisthotic Long and slowly reduces in height distally Very short and expanding distally
Distinct "keel" on the anterior end of the dentary Present Absent, dentary slightly downturned anteriorly
Dorsal vertebrae Relatively short with high neural spine Relatively long with low neural spine

 

TABLE 3. The lengths of the maxilla, dentary tooth row, and premaxillary body of each relevant Tanystropheus specimen from Monte San Giorgio and the relative size of each specimen based on these measurements. Specimens assigned to the small morphotype are indicated by an asterisk. Abbreviations: ia, inapplicable.

  Maxilla length
(in mm)
Dentary
length
Premaxilla main body
(in mm)
Relative
size maxilla 
(in %)
Relative
size dentary 
(in %)
Relative size premaxilla 
(in %)
Mean
relative
skull size
estimate
(in %)
Femur
length
(in mm)
Relative
size femur
(in %)
PIMUZ T 2819 74.6 113.83 35.6 100 100 100 100 ? ia
PIMUZ T 2790 46.2 81.52 34.13 61.93029 71.62 95.87079 76.47 ? ia
PIMUZ T 2787 43.8? 71.65 30 58.71314 62.94 84.26966 68.64 148.03 100
PIMUZ T 2792 (cast of SNSB-BSPG 1953 XV 2) 40.87? 57.93? 16.04 54.78552 50.89? 45.05618 50.24 106.25 71.78
PIMUZ T 2482* 27.2 35.58 11.83 36.46113 31.26 33.23034 33.65 ? ?
MSNM BES SC 265* 24.9 33.8 11 33.37802 29.69 30.89888 31.32 71 47.91/48.84
MSNM BES SC 1018* 24.2 30.3 35.6 32.43968 31.27 26.96629 30.23 70.92/72.3 54.21
PIMUZ T 2795* ? ? 10.75 ? ? 30.19663 30.19663 80.25 47.96
PIMUZ T 1277* ? 34.04 ? ? 29.9 ? 29.9 ? 56.45
PIMUZ T 2484* 23.55 32.44 10.47 31.56836 28.5 29.41011 29.83 57.89 ?
PIMUZ T 2779* ? 30.88? 9.07 ? 27.13? 25.47753 26.3 ? 39.11
PIMUZ T 3901* 20.39 30.06 7.8 27.33244 26.41 21.91011 25.22 83.56 ?

 

 

TABLE 4. The measurements and ratios used to establish the relative size of the prenarial and postnarial processes of the premaxilla and the dentary keel of each relevant Tanystropheus specimen from Monte San Giorgio. Specimens assigned to the small morphotype are indicated by an asterisk. Abbreviations: de., dentary; ia, inapplicable; pmx., premaxilla; po. p., postnarial process; pre. p., prenarial process.

  Pmx. pre. p. length
(in mm)
Pmx. pre. p. length
(in mm)
Dentary keel height
(in mm)
Pmx. pre p./pmx. main body Pmx. po. p./pmx. main body De. keel/de. tooth margin
PIMUZ T 2819 ? ia 4.8 ? ia 0.046602
PIMUZ T 2790 3 ia 4.4 0.087899 ia 0.095238
PIMUZ T 2787 ia 7 1.5? ia 0.233333 0.022422
PIMUZ T 2792 (cast of SNSB-BSPG 1953 XV 2) 0.94 5.1 3.83 0.058603 0.317955 0.075142
PIMUZ T 2482* 1.56? 2.25 ia 0.131868 0.190194 ia
PIMUZ T 2795* 0.78? ? ? 0.072558 ? ?
MSNM BES SC 265* ? ? ia ? ? ia
MSNM BES SC 1018* 0.4 6.6 ia 0.041667 0.6875 ia
PIMUZ T 2484* 1.37 4.36 ia 0.13085 0.416428 ia
PIMUZ T 2779* 1.02 2.36 ? 0.112459 0.260198 ?
PIMUZ T 3901* ? 5.1 ia ? 0.653846 ia
PIMUZ T 1277* ? ? ia ? ? ia

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