Fig. 3. Male tail defect in smp-1 and smp-2 mutants. Posterior is upwards in each panel. The arrows indicate ray 1 or its expected position. (A) The wild-type male tail has nine rays on each side (ventral view). (B-F) A common defect in ray 1 is its position, which ranges from anterior (B,C, lateral views) or anterior and dorsal (D,E, lateral and ventral views, respectively), to a complete absence of an external ray 1 (F, right side).