Fig. 1

Light micrographs of adult males of Trilobodrilus axi (a), Dinophilus vorticoides (c) and D. gyrociliatus (e) with details of the copulatory organs (b, d, f). Whole-mounted specimens in a, c) dorsal view, b, d, f) in ventral view, e) in lateral view; anterior oriented to the left. Abbreviations: adc – anterior dorsal ciliation, an – anus, avc – anterior ventral ciliation, cg – cerebral ganglion, co – copulatory organ (penis), dlm – dorsal longitudinal muscle, ey – eye, gp – gonopore, hg – hindgut, mo – mouth opening, np – brain neuropil, oe – oesophagus, pcb – prostomial ciliary band, pcc – prostomial compound cilia, pvc – posterior ventral ciliation, sgd – stylet gland ducts, sto – stomach, sv – seminal vesicle, test – testis