. Bulletin of the Natural Histort Museum. Geology series. . Fig. 40 Baryonyx walkeri, holotype. BMNH R9951; proximal part of left femur. A, lateral view; B, proximal; C, medial, x diverging as gentle concave curves; the lateral margin develops a distinct lip, protruding laterally. The profile of the posteroventral sdge is weakly concave, so that the pubis expands a little posteroventrally towards the distal end. However, the end itself does not expand extensively either anteriorly or posteriorly to form a 'pubic boot', as it does in many other theropods; indeed the distal profile of the
. Bulletin of the Natural Histort Museum. Geology series. . Fig. 40 Baryonyx walkeri, holotype. BMNH R9951; proximal part of left femur. A, lateral view; B, proximal; C, medial, x diverging as gentle concave curves; the lateral margin develops a distinct lip, protruding laterally. The profile of the posteroventral sdge is weakly concave, so that the pubis expands a little posteroventrally towards the distal end. However, the end itself does not expand extensively either anteriorly or posteriorly to form a 'pubic boot', as it does in many other theropods; indeed the distal profile of the medial or lateral surface forms a smooth convex ;urve. The medial surface is perceptibly concave towards its distal ;nd. Ischium (Fig. 39B). A large part of the left ischium is preserved, including most of the shaft (total length of the element as preserved 470 mm). It lacks only the distal end of the shaft and a small part of :he anterior edge of the pubic peduncle. Of the right ischium there remain only four fragments of the proximal end, none of which can i3e fitted together directly; one of them includes the pubic articula- :ion with a small part of the acetabulum, another includes the jbturator flange (see below), a third small piece is a further length of ;he acetabular margin, and a fourth piece is a length of the upper part 3f the shaft. The element as preserved is a fairly typical ischium, shaped somewhat like a Y. Between the two peduncles is the most ventral jDortion of the acetabular ring, narrower in the centre and widening in ;ither direction towards the articulating surfaces for the pubis and Hum respectively; the iliac surface is the larger of the two. Both jeduncles (and of course the margins of their articulating surfaces) ire convex on their lateral sides and concave medially. Ventral to this egion the ischium forms a broad plate which has a stout posterior â nargin; just below the iliac peduncle this plate is weakly concave between two longitudinal ridges.
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Photo credit: © Book Worm / Alamy / Afripics
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Keywords: ., bhlconsortium, bookcentury1900, bookcollectionbiodiversity, bookl
