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 |