MaleMusFIG 21: The spicule muscles.

Right panel: Illustration of the adult male tail region featuring the spicules, left lateral view. Sexually dimorphic muscles are underlined. (adp) anal depressor, (aob/pob) anterior and posterior oblique muscles, (v/dsrL) ventral and dorsal spicule retractors, (v/dspL) ventral and dorsal spicule protractors; (gec) gubernacular erector. Left panel; Lineage tree of male muscles (as shown in MaleMusFIG 3)