Pleon of five incompletely separated pleomeres, first four bearing very slender biramous
pleopods, their endopodites much smaller.
parapodia with dorsal cirri twice as long as the ventral cirri, but similar in width; notopodial ligules triangular, superior one longer than wide, inferior one about as long as wide.
pugaporcinus has well-developed B1 and B2 annulations and biramous
parapodia on these segments.
The antennules are biramous
, with an inner and an outer flagellum.
The functional outcome is flexibility of position and movement at the other end of the tail where the biramous
appendages (uropods) of the sixth abdominal segment, together with the telson, form a tailfan (Fig.
The larvae remain in the water column and move slowly by beating the external rami, exopodites, of their biramous
limbs (Ennis, 1995).
The exopodites of the thoracic limbs are lost, and locomotion is provided by the endopodites - which become the pereiopods, or walking legs - and by the biramous
pleopods of the abdomen.