Each papilla
bore a longitudinal opening along the oval convex base
(Fig. 6). On the caudal segment, a pair of posterior
spiracles was prominent centrally on the smooth, rounded
area of the integument (Fig. 7). The peritreme of
each spiracle formed a crude forward or reverse
D-shape, encircling three sinuous spiracular slits. Fine
posterior spiracular hair was also observed. The button
was apparent, located centrally in the inner side of the
peritreme (Fig. 8)