; larger than those of fifth stage; adult-like.
1A): Biramous; endopod and exopod each with one lateroventral and two terminal setae.
1E): Biramous; endopod with three terminal and three lateroventral setae; exopod with three terminal and three lateroventral setae.
2A): Biramous; protopodal part swollen; endopod and exopod each with two terminal and one lateroventral setae; coxal part enlarged.
2C): Biramous; segmentation rudimentary; endopod with three terminal and two lateroventral setae; exopod with four terminal and five lateroventral setae.
2C): Biramous; protopod bulbous; setation unchanged.
Protopod of first and second thoracopods large, carrying biramous
rami, with each ramus transformed into movable chela.
Pleon of five incompletely separated pleomeres, first four bearing very slender biramous pleopods, their endopodites much smaller.
Pleon nearly straight across posterior margin, of six pleomeres, first five produced into extended lateral plates, sixth as small embedded pleotelson; five pairs of biramous pleopods, exopodites of first three greatly expanded; no uropods.
Five pairs of biramous pleopods nearly symmetrical on opposite sides of body, endopodites of first three pairs greatly expanded into large subrectangular fleshy lobes extending far to sides, other exopodites and all endopodites much reduced and mostly extending posteriorly somewhat beyond margins of lateral plates; pleopods covering all but small medioanterior region of pleon ventrally.
First two parapodia uniramous, all others biramous
. Anterior biramous
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.