femorotibialis

For example, the comparatively reduced femoral trochanter and patella of UNSM 20030 would limit the area available for the attachment of several muscles (i.e., the lateral and medial obturatorius, medial and cranial iliotrochantericus, medial femorotibialis, and medial gastrocnemius) crucial to orienting the hindlimb for the power stroke and providing propulsive force during diving, thus possibly limiting the speed of Fumicollis hoffmani.

2015 November 19, “Identification of a New Hesperornithiform from the Cretaceous Niobrara Chalk and Implications for Ecologic Diversity among Early Diving Birds”, in PLOS ONE, →DOI