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TABLE 1. Areas for the muscles origins in the different variant models.

 
 

Area (cm^2)

 

mPST

mAME

mAMP

mAMES

mDM

mPT

Initial model

11.3213

58.3881

29.4737

43.5531

13.1584

24.3531

Low parietal

9.09129

34.8869

37.6998

45.681

13.1584

21.0722

Thin temporal

9.87854

52.74

37.2582

28.9364

18.912

22.0872

Small supratemporal

11.2411

31.9708

36.9917

27.8797

23.2992

13.3696

 

TABLE 2. Angles for the orientation of the different forces produced by the muscles in all models.

 
 

Angles between forces components (°)

Dorsoventral and mediolateral axis

25

23

0

0

0

35

Anteroposterior and mediolateral axis

0

0

0

0

0

70

Dorsoventral and anteroposterior axis

0

0

31

0

0

36

 

TABLE 3. Morphometric data of different skull measurements in various eosauropterygians, and extant phylogenetically-relevant taxa used for comparisons and contextualization.

 

Higher-rank clade

Taxon

Specimen

Data Source

Total length of
the skull (TLS)

Supratemporal
fenestra lenght (SFL)

Maximum height of the
parietal (MHP)

Adductor Chamber
Height (ADH)

Sauropterygia

Libonectes morgani

SMUSMP 69120

Measured with ruler

45

17

8.5

19

Sauropterygia

Callawayasaurus columbensis

UCMP 38349

O'Keefe 2001

15.8

5.8

2.9

4.56

Sauropterygia

Rhomaleosaurus zetlandicus

YORYM G503

Taylor 1992

91.1

27.23

4.4

17.3

Sauropterygia

Nothosaurus winterswijktensis

NMNHL St 445530, NMNHL St 445913

Albers and Rieppel 2003

131.8

46.7

?

?

Sauropterygia

Nothosaurus haasi

HUJ-Pal 2250

Rieppel et al 1999

119.2

38.8

4.8

13.8

Sauropterygia

Placochelys placodonta

FAFI Ob/2323/Vt.3

Rieppel 2001

156.8

74.4

14.9

47.8

Sauropterygia

Cyamodus rostratus

UMO BT 748

Rieppel 2001

118.6

57.9

14.31

64.48

Sauropterygia

Henodus chelyops

Specimen I and II

Rieppel 2001

145.6

62.5

?

50.2

Sauropterygia

Macroplacus raeticus

BSP 1967 I 324

Rieppel 2001

191.1

96.9

24.6

69.8

Sauropterygia

Protenodontosaurus italicus

MFSN 1819GP

Rieppel 2001

156

63.6

15.5

74.5

Crocodilyformes

Alligator mississipensis

SMU Uncatalogued

Measured with ruler and calliper

450

28.08

13.69

133.88

Chelonia

Chelydra serpentina

SMU R-160

Measured

106.83

64.32

13.82

39.38

Chelonia

Testudo sp.

SMU Uncatalogued

Measured from cast

120.98

66.13

14.73

54.39

Chelonia

Chelonia mydas

SMU Uncatalogued

Measured

205.65

54.48

38.82

95.81

Chelonia

Lepidochelys olivacea

SMU Uncatalogued

Measured from cast

157.6

37.58

29.55

69.44

Varanidae

Varanus

SMU Uncatalogued

Measured from cast with ruler and calliper

226

49.34

14.06

63.85

Rhyncocephalia

Sphenodon punctatus

SMU Uncatalogued

Measured from cast

63.96

21.13

7.04

27.52

Serpentes

Python

SMU Uncatalogued

Measured

134.52

63.52

16.92

28.93

Lacertidae

Cyclura cornuta

SMU Uncatalogued

Measured from cast

132.39

38.24

21.22

57.5

Mosasauria

Tylosaurus

SMU Uncatalogued

Measured from cast with ruler

150

33

8

33

Mosasauria

Platecarpus

SMU Uncatalogued

Measured from cast with ruler and calliper

370

95.86

19.48

90.69

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