The osteology of Magnosaurus nethercombensis (Dinosauria, Theropoda) from the Bajocian (Middle Jurassic) of the United Kingdom and a re-examination of the oldest records of tetanurans

Figures & data

Figure 1 Megalosaurid dentaries. A-C, right dentary of Magnosaurus nethercombensis OUMNH J.12143/1b in medial (A, B) and dorsal (C) views; D, E, right dentary of Megalosaurus bucklandii OUMNH J.13505 in dorsal (D) and medial (E) views; F, right dentary of Duriavenator hesperis BMNH R332 in medial view; G, right dentary of Eustreptospondylus oxoniensis OUMNH J.13556 in medial view; H, left dentary of Dubreuillosaurus valesdunensis in medial view (reversed). In line drawing (B) light grey tone indicates tooth and dark grey tone indicates broken bone. Abbreviations: 3rd, third dentary alveolus; idp, interdental plate; mef, Meckelian fossa; meg, Meckelian groove; mfr, Meckelian foramen. Scale bars equal 100 mm. Parts of image are modified from Benson et al. (2008) (D, E) and Benson (2008a) (F).

Figure 2 Dentaries of Magnosaurus nethercombensis in lateral view. A, B, right dentary OUMNH J.12143/1b with magnified (x3) portions showing elongate foramina (A); C, left dentary OUMNH J.12143/1a. Abbreviations: for, foramen. Scale bar equals 100 mm.

Table 1 Selected measurements (in millimetres) of Magnosaurus nethercombensis vertebrae. Abbreviations: anterior dv, dorsoventral height of anterior surface of centrum; anterior ml, mediolateral width of anterior surface of centrum; posterior dv, dorsoventral height of posterior surface of centrum; posterior ml, mediolateral width of posterior surface of centrum; i, measurement incomplete due to damage; e, measurement estimated from incomplete specimen.

Specimen number		Position	Length	Min width	Anterior dv	Anterior ml	Posterior dv	Posterior ml
OUMNH	/8	Caudal	66e	37	?	?	65	56
J.12143	/9	Dorsal	74i	35	70e	64	?	?

Figure 3 Vertebrae of Magnosaurus nethercombensis. A-C, dorsal vertebra OUMNH J.12143/9 in right lateral (A), anterior (B), and ventral (C) views; D-F, proximal caudal vertebra OUMNH J.12143/8 in ventral (D), posterior (E), right lateral (F), and anterior (G) views. Abbreviations: chf, chevron facet. Scale bar equals 50 mm.

Figure 4 Pelvic bones of Magnosaurus nethercombensis. A, B, partial right ilium OUMNH J.12143/10 in lateral (A) and medial (B) views; C, D, proximal portion of left pubis OUMNH J.12143/11 in lateral (C) and medial (D) views; E-G, shaft of right pubis OUMNH J.12143/3 in medial (E), anterior (F), and posterior (G) views. Abbreviations: ipr, ischial process; isp, ischial peduncle; pua, pubic apron. Scale bar equals 100 mm.

Figure 5 Hindlimb bones of Magnosaurus nethercombensis. A-F and L, left femur OUMNH J.12143/7 in anterior (A, B), lateral (C), posterior (D, E), medial (F), and distal (L) views; G-K, right femur OUMNH J.12143/6 in anterior (G), medial (H), posterior (I-J), and distal (K) views; M-R, left tibia OUMNH J.12143/2 in anterior (M, N), lateral (O, P), proximal (Q), and distal (R) views. In line drawings (B, E, J, N, P) crossed hatching indicates matrix, light grey tone indicates plaster, and dark grey tone indicates broken bone. Abbreviations: cnc, cnemial crest; ctf, crista tibiofibularis; ffl, fibular flange; flx, flexor groove; lco, lateral condyle; mco, medial condyle; sab, suprastragalar buttress. Scale bar equals 200 mm.

Figure 6 Theropod hindlimb bones from the Blue Lias of Charmouth, Dorset. A-F and L right femur BMNH 39496 in anterior (A, B), medial (C), posterior (D, E), lateral (F), and distal (L) views; G-K and M, right tibia BMNH 39496 in anterior (G), medial (H), posterior (I), lateral (J, K), and proximal (M) views; N-S, left femur GSM 109560 in medial (N, O), anterior (P, Q), posterior (R), and lateral (S) views. In line drawings (B, E, K, O, Q) dark grey tone indicates broken bone and light grey tone indicates reconstructed areas. Abbreviations: ail, anterior intermuscular line; cnc, cnemial crest; ctf, crista tibiofibularis; ffl, fibular flange; for, foramen; ft, fourth trochanter; ict, incisura tibialis; lco, lateral condyle; lt, lesser trochanter; mco, medial condyle; mdc, medial distal crest; trs, trochanteric shelf. Scale bars equal 100 mm.

Benson , R. B. J. , Barrett , P. M. , Powell , H. P. and Norman , D. B. 2008 . The taxonomic status of Megalosaurus bucklandii (Dinosauria, Theropoda) from the Middle Jurassic of Oxfordshire, UK . Palaeontology , 51 : 419 – 424 .

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Benson , R. B. J. 2008c . “ Reassessment of Middle Jurassic theropod relationships with a focus on the UK record ” . In 6th meeting of the European Association of Vertebrate Palaeontologists, 30th June-5th July, Spišska Nová Ves, Slovak Republic , Edited by: Krempaská , Z. 15 – 16 . Spišska Nová Ves, , Slovakia : The Museum of Spiš .

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