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Left pterygoid of Camarasaurus lentus DNM 28 in medial view. Note the presence of a hook-like process at the articulation surface for the basipterygoid process (C101-1). Diplodocidae, on the other hand, only have shallow articular facets without hooks. Abb.: ap, anterior process; bph, basipterygoid hook; er, ectopterygoid ramus; qr, quadrate ramus. Picture traced from Madsen, McIntosh & Berman (1995). Scale bar = 10 cm.
