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'Plesiosaurus' megacephalus: Table

TABLE 1. Selected measurements (in mm) and vertebral counts for BRSMG Cb 2335 as given by Stutchbury (1846, measurements converted from inches), Sollas (1881, measurements converted from inches) and Swinton (1948), and measurements of BGS GSM 118410 for comparison.

 

MeasurementStutchbury (1846)Sollas (1881)Swinton (1948)BGS GSM 118410
Total length 4953 4953 4960 n/a
Neck length n/a 1430 1350/1370 (two conflicting measurements are given) n/a
Cervical vertebrae count 29 29-30 30 n/a
Tail length n/a 1384 1300 n/a
Caudal vertebrae count 31 n/a 32 n/a
Skull length (from anterior tip of snout to the...) 813 (... end of the articular bones) 762 (...back of the quadrate) 830 (...back of the angular) 830 (...back of the angular)
Premaxilla tip to external nares length 244 n/a n/a 235
Premaxilla tip to orbit anterior margin length 292 n/a n/a 290
Premaxillary rostrum length n/a n/a n/a 110
Premaxillary rostrum width 133 n/a n/a 110
External naris length 28 n/a n/a 27.6
External naris width 12.7 n/a n/a 11.2
Anterior interpterygoid vacuity length n/a n/a n/a approx. 60
Mandibular symphysis length 142 n/a 150 127.1
Maximum width of mandible adjacent to mandibular symphysis n/a n/a n/a 128.5
Maximum skull width (across mandible) n/a n/a n/a 455
Skull width across angulars n/a n/a 340 340
Length of premaxilla to basisphenoid n/a n/a 570 n/a
Length of parasphenoid bar between posterior interpterygoid vacuities n/a n/a 48 n/a
Posterior interpterygoid vacuity length n/a n/a 46 42
Posterior interpterygoid vacuity width n/a n/a 25 24
Maximum width between the outer borders of the posterior interpterygoid vacuities n/a n/a 68 62
Preserved basisphenoid length n/a n/a 36 n/a
Width of mandibular ramus at glenoid n/a n/a n/a 70 (left), 87 (right)
Maximum width of retroarticular process n/a n/a n/a 39
Hyoid length 145 n/a 147 147
Atlas-axis length n/a n/a n/a 98
Entire forelimb length n/a 838 n/a 825
Humerus length 348 348 350 350
Humerus distal width 178 n/a 180 183
Width of humeral head 84 n/a 85 93
Radius length 117 117 113 117
Proximal width of radius 89 n/a 91 91
Distal width of radius 69 n/a 70 69
Ulna length 109 109 105 110
Width of the ulna at midlength 84 n/a 84 81
Femur length n/a 343 340 n/a
Tibia length 114 114 118 n/a
Fibula length 114 114 118 n/a