Gonopods of Trigoniulus andersoni, one of the Opisthospermophora (Spiroboloidea). :A, Anterior view, and B, lateral views of the apparatus. "ant", anterior, and "post", posterior portions of the coleopod ensheathing the phallopod, of which the proximal portion, "ph", is shown. :C, Phallopod removed from the coleopod.