Plesiosaur mastication: Tables

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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.

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

Angles between forces components (°)

Dorsoventral and mediolateral axis

Anteroposterior and mediolateral axis

Dorsoventral and anteroposterior axis