Nanaloricus sp. Schematic drawing of the myoanatomy of an adult with fully extended head. The outer contour of the specimens is represented by the black line. Note that the shape and the position of the scalids is merely representative. Abbreviations: a, abdomen; atI-V, abdominal transverse muscles; btr, buccal tube retractors; bu, buccal tube; cs, clavoscalid; dl, dorsal longitudinal retractor muscle; i, introvert; iar, introvert anterior ring muscle; ipr, introvert posterior ring muscle; lo, lorica; mc, mouth cone; mcr, mouth cone retractors; mt, mouth tube; n + t, neck and thorax; nc, neck circular muscle; nl, net-like thin muscles; or, oral ridge; pbm, pharyngeal bulb musculature; psc, posteriormost short curved muscles; ss, spinoscalid; sp, short posterior longitudinal muscles; tl, thin longitudinal muscles; vl, ventral longitudinal retractor muscle.