TABLE 1. Measurements of the teleosaurid specimens used in the first set of regression analyses (i.e. the most complete skeletons). All measurements in cm.

Specimen Femoral length Cranial length Total body length
Platysuchus multiscrobiculatus
SMNS 9930
20 45.5 279
Steneosaurus bollensis
GPIT/RE/1193/2
34 78.5 461
Steneosaurus bollensis
MH unnumbered A
36 91 477
Steneosaurus bollensis
MH unnumbered B
24 59.5 312
Steneosaurus bollensis
SMNS 54063
30.5 78 430
Steneosaurus bollensis
SMNS 52475
21.9 52.5 304
Steneosaurus bollensis
SMNS 51984
22.5 59 320
Steneosaurus bollensis
MTM unnumbered
18.1 48 278
Steneosaurus edwardsi
GPIT/RE/07286
39 102 502
Steneosaurus edwardsi
PETMG R175
40.5 109 501.5
Steneosaurus leedsi
NHMUK PV R 3806
29.8 88 428
Steneosaurus priscus
MNHN.F CNJ 78a
25 68.3 347


TABLE 2.
Measurements of the teleosaurid specimens added to the second set of regression analyses (i.e., the skeletons lacking at least 10-20 cm of the distal tail). All measurements in cm.

Specimen Femoral length Cranial length Total body length
Steneosaurus sp.
SMNS 51753
24 66 312
Steneosaurus bollensis
SMNS 51555
22 63.5 306.5
Steneosaurus bollensis
SMNS 51957
27 59 311
Steneosaurus bollensis
SMNS uncatalogued
13.5 35.5 227.5


TABLE 3.
Measurements of the Pelagosaurus typus specimens. All measurements in cm.

Specimen Femoral length Cranial length Total body length
SMNS 51753 17.5 42 233.5
MTM M62 2516 11.1 27.5 145


TABLE 4.
The 12 most complete teleosaurid specimens used in the regression analyses, with their recorded lengths and estimated lengths using the cranial-total body length equations of three extant species ( Alligator mississippiensis, Crocodylus porosus, and Gavialis gangeticus ). All measurements in cm.

Specimen Measured length Crocodylus equation Gavialis equation Alligator equation
Platysuchus multiscrobiculatus
SMNS 9930
279 331.3 274.2 333.8
Steneosaurus bollensis
GPIT/RE/1193/2
461 585.2 518.9 568.9
Steneosaurus bollensis
MH unnumbered A
477 681.4 611.6 658.0
Steneosaurus bollensis
MH unnumbered B
312 439.0 378.0 433.5
Steneosaurus bollensis
SMNS 54063
430 581.4 515.2 565.4
Steneosaurus bollensis
SMNS 52475
304 385.1 326.1 383.6
Steneosaurus bollensis
SMNS 51984
320 435.1 374.3 423.0
Steneosaurus bollensis
MTM unnumbered
278 350.5 292.8 351.6
Steneosaurus edwardsi
GPIT/RE/07286
502 766.1 693.2 736.4
Steneosaurus edwardsi
PETMG R175
501.5 820.0 745.1 786.3
Steneosaurus leedsi
NHMUK PV R 3806
428 658.3 589.4 636.7
Steneosaurus priscus
MNHN.F CNJ 78a
347 506.7 443.3 496.2

 

 

TABLE 5. Estimated body lengths for the 12 most complete teleosaurid specimens used in the regression analyses. All four regression equations generated herein are compared against specimen recorded total lengths. All measurements in cm.

Specimen Total body length (cm) Total body length estimates (cm)
CL complete CL incomplete FL complete FL incomplete
Platysuchus multiscrobiculatus
SMNS 9930
279 275.05 265.20 290.46 285.95
Steneosaurus bollensis
GPIT/RE/1193/2
461 407.57 401.78 450.067 444.43
Steneosaurus bollensis
MH unnumbered A
477 457.77 453.52 472.86 467.07
Steneosaurus bollensis
MH unnumbered B
312 331.27 323.14 336.06 331.23
Steneosaurus bollensis
SMNS 54063
430 405.57 399.71 410.16 404.81
Steneosaurus bollensis
SMNS 52475
304 303.16 294.17 312.12 307.46
Steneosaurus bollensis
SMNS 51984
320 329.26 321.07 318.96 314.25
Steneosaurus bollensis
MTM unnumbered
278 285.09 275.54 268.80 264.44
Steneosaurus edwardsi
GPIT/RE/07286
502 501.95 499.05 507.06 501.03
Steneosaurus edwardsi
PETMG R175
501.5 530.06 528.02 524.16 518.01
Steneosaurus leedsi
NHMUK PV R 3806
428 445.73 441.10 402.18 396.89
Steneosaurus priscus
MNHN.F CNJ 78a
347 366.61 359.56 347.46 342.55


TABLE 6.
Statistics for the results of the regression analyses comparing the fit of both the cranial and femoral lengths with the total body length, conducted individually for complete specimens only and for all specimens. The best fitting model is highlighted in bold.

Dataset Model Multiple
R2
Adjusted
R2
p value AIC AICc AICc
weight
Complete specimens Total length ~ Cranial length 0.9315 0.9247 <0.0001 114.3449 115.6783 0.0075
Total length ~ Femoral length 0.9696 0.9666 <0.0001 104.5866 105.92 0.9925
All specimens Total length ~ Cranial length 0.9236 0.9182 <0.0001 152.9013 153.8244 0.0603
Total length ~ Femoral length 0.9548 0.9478 <0.0001 146.5062 148.5062 0.9397


TABLE 7.
Estimated body lengths for the two Pelagosaurus typus specimens measured herein. All six thalattosuchian regression equations are compared against specimen recorded total lengths. All measurements in cm.

Specimen Total body length 12 complete teleosaurids All 16 teleosaurids Metriorhynchids
CL FL CL FL CL FL
SMNS 51753 233.5 256.97 261.96 246.57 257.65 217.58 247.94
MTM M62 2516 145 202.76 189.00 190.69 185.20 143.25 166.71


TABLE 8. Estimated body lengths for large-bodied brevirostrine/mesorostrine teleosaurids, namely species in the genus Machimosaurus, and Steneosaurus edwardsi and S. obtusidens. All measurements in cm. Measurements in bold are estimates and/or based on reconstructed elements.

Species Cranial or femoral length Total body length estimate
Complete skeletons Including incomplete tails
Machimosaurus rex (holotype) 155 (CL; Fanti et al., 2016) 714.80 718.42
Machimosaurus hugii 149 (CL; Krebs, 1968) 690.70 693.58
Machimosaurus mosae(holotype) 130 (CL; Sauvage and Liénard, 1879) 614.40 614.94
Machimosaurus mosae (neotype) 96.5 (CL; Hua, 1999) 479.86 476.28
Machimosaurus buffetauti 100 (CL; Buffetaut, 1982b) 493.92 490.77
Machimosaurus buffetauti(holotype) 93.5 (CL; Young et al., 2014) 467.81 463.87
Steneosaurus edwardsi 53 (FL; Johnson et al., 2015) 666.66 659.51
Steneosaurus obtusidens (holotype) 116 (CL; Andrews, 1913) 558.17 556.00