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JOURNAL OF PALEONTOLOGY, V. 74, NO. 5, 2000

TABLE 2—Length/height/breadth of the smallest and largest dimensions of vertebral centra of polycotylid plesiosaurs (in mm). Marks and abbreviations: *, juvenile or young individuals; Italic figures, estimation; Number in parenthesis, sequencial number of the vertebra in the vertebral column; Lg/Sm, largest/smallest vertebra of unknown sequential number in the region of the column (i.e. cervical, dorsal etc.); n.a, data not available. Specimen UMUTMV 19965 Polycotylus latipinnis (YPM 1125) Trinacromerum bentonianum (USNM 10945) T. kirki (MM v216) T. ‘‘willistoni’’ (KUVP 5070) T. ‘‘brownorum’’ (SMPSMU 3025) *‘‘T. anonynum’’ (YPM 1129) *Dolichorhynchops osborni (KUVP 1300) *D. osborni (FHSM VP404) *D. osboni (MCZ 1064)

Cervical vertebrae 40/53/64 (A), 40/55/65 (B) 38/54/64 (4), 41/80/93 (25) 52/60/68 (Sm), 53/76/82 (Lg) n.a. 29/n.a./n.a. (Sm), 43/n.a./n.a. (Lg) 34/44/n.a. (4), 45/70/n.a. (20) 23/n.a./n.a. (3), 36/n.a./n.a. (21) 28/30/35 (3), 26/38/45 (16) 19/23/30 (3), 32/42/n.a. (20) 34/22/n.a. (3), 26/46/48

Specimen UMUTMV 19965 P. latipinnis (YPM 1125) T. bentonianum (USNM 10945) T. kirki (MM v216) T. ‘‘willistoni’’ (KUVP 5070) T. ‘‘brownorum’’ (SMPSMU 3025) *‘‘T. anonynum’’ (YPM 1129) *D. osborni (KUVP 1300) *D. osborni (FHSM VP404) *D. osboni (MCZ 1064)

Dorsal vertebrae 40/56/64 (A) 45/86/98 (30), 57/79/81 (50) 62/85/90 (Sm), 68/93/94(Lg) 64/n.a./96 (Sm), n.a./87/97 (Lg) 43/n.a./n.a. (Sm), 53/n.a./n.a. (Lg) n.a. 34/n.a./n.a. (24), 48/n.a./n.a. (31) n.a. 32/47/n.a. (25), 35/50/n.a. (43) 38/n.a./n.a. (22), 45/n.a./n.a. (42)

Specimen UMUTMV 19965 P. latipinnis (YPM 1125) T. bentonianum (USNM 10945) T. kirki (MM v216) T. ‘‘willistoni’’ (KUVP 5070) T. ‘‘brownorum’’ (SMPSMU 3025) *‘‘T. anonynum’’ (YPM 1129) *D. osborni (KUVP 1300) *D. osborni (FHSM VP404) *D. osboni (MCZ 1064)

Sacral vertebrae 39/55/61 (A), 38/57/60 (B) 58/75/79 (54), 59/76/77 (56) 68/91/92 (Sm), 65/99/93 (Lg) n.a. n.a. n.a. n.a. n.a. 33/n.a./n.a. (47), 37/n.a./n.a. (49) 37/n.a./n.a. (43), 36/n.a./n.a. (45)

Specimen UMUTMV 19965 P. latipinnis (YPM 1125) T. bentonianum (USNM 10945) T. kirki (MM v216) T. ‘‘willistoni’’ (KUVP 5070) T. ‘‘brownorum’’ (SMPSMU 3025) *‘‘T. anonynum’’ (YPM 1129) *D. osborni (KUVP 1300) *D. osborni (FHSM VP404) *D. osboni (MCZ 1064)

Caudal vertebrae 40/57/62 (A), 25/32/34 (D) 37/47/47 (69) n.a. n.a./77/86 (Lg) n.a. n.a. 38/n.a./n.a. (54), 34/n.a./n.a. (57) 25/n.a./40 (n.a), 12/n.a./12 (n.a) 35/n.a./n.a. (50), 28/52/n.a. (55) 37/n.a./n.a. (46), 30/n.a./n.a. (60)

TABLE 3—Comparison of the dimensions of propodial bones of UMUT MV 19965 and other polycotylid plesiosaurs (in mm). Marks and abbreviations: *, juvenile or young individuals; **, data recalculated from published figures; L, left; R, right; n.a., data not available. Humerus Specimen UMUT MV 19965 **‘‘Polycotylus latipinnis’’ (Williston, 1902) Trinacromerum kirki (MM v216) T. bonneri (KUVP 40002) **‘‘T. anonynum’’(YPM 1129) ‘‘T. latimanus’’ (Williston, 1908) *,**Dolichorhynchops osborni (KUVP 1300) *D. osborni (FHSM VP404)

Femur

Length

Widest breadth

Length

Widest breadth

R357 R492 R455 R526, L546 L340 L351 R260 R330

R157 R256 R2221 R320, L325 L167 L250 R140 R165

n.a. n.a. R473 R515, L530 L380 n.a. R380 R335

n.a. n.a. R236 R300, L280 L170 n.a. R170 R190

Sato & Storrsa, 2000  

1 Present address: Department of Geology and Geophysics, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada, and R...

Sato & Storrsa, 2000  

1 Present address: Department of Geology and Geophysics, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada, and R...