Muscle of ant head (<i><a href="//commons.wikimedia.org/wiki/Formica_fusca" title="Formica fusca">Formica fusca</a></i>)
W M Wheeler
1927
Wheeler, W.M. (1927): The physiognomy of insects. <i>Quarterly Review of Biology</i> <b>2</b>: 1-36. <a rel="nofollow" class="external text" href="http://research.amnh.org/entomology/social_insects/ants/publications/3389/3389.pdf">PDF</a>