Lybia plumosa Barnard, 1947

Clark, Paul F. & Paula, José, 2003, Descriptions Of Ten Xanthoidean (Crustacea: Decapoda: Brachyura) First Stage Zoeas From Inhaca Island, Mozambique, Raffles Bulletin of Zoology 51 (2), pp. 323-378 : 343

Lybia plumosa Barnard, 1947

( Figs. 17-20 )

Larval description. – Carapace ( Figs. 17a, d ): dorsal spine long and curved distally, longer than rostral spine; rostral spine shorter than dorsal spine, slightly shorter in length to protopod of antenna and distally spinulate; lateral spines long and straight; 1 pair of posterodorsal setae; ventral margin without setae; eyes sessile.

Antennule ( Fig. 17b ): uniramous, endopod absent; exopod unsegmented with 2 broad, long, 2 shorter, slender terminal aesthetascs and 1 terminal seta.

Antenna ( Fig. 17c ): protopodal process distally multispinulate, slightly longer in length than rostral spine; endopod spine present; exopod ca. 14% length of protopod, possessing 3 (1 long subterminal, 2 terminal unequal) setae.

Mandible: endopod palp absent.

Maxillule ( Fig. 18a ): epipod seta absent; coxal endite with 7 setae; basial endite with 5 setal processes and 2 small teeth; endopod 2-segmented, proximal segment with 1 seta; distal segment with 6 (2 subterminal, 4 terminal) setae; exopod seta absent.

Maxilla ( Fig. 18b ): coxal endite bilobed with 4+4 setae; basial endite bilobed with 5+4 setae; endopod bilobed, with 3+5 (2 subterminal, 3 terminal) setae; exopod (scaphognathite) margin with 4 setae and 1 long distal stout process.

First maxilliped ( Fig. 19a ): coxa without seta; basis with 10 setae arranged 2,2,3,3; endopod 5-segmented with 3,2,1,2,5 (1 subterminal, 4 terminal) setae respectively; exopod 2- segmented, distal segment with 4 long terminal plumose natatory setae.

Second maxilliped ( Fig. 19b ): coxa without setae; basis with 4 setae arranged 1,1,1,1; endopod 3-segmented, with 1,1,5 (2 subterminal, 3 terminal) setae respectively; exopod 2- segmented, distal segment with 4 long terminal plumose natatory setae.

Third maxilliped: absent.

Pereiopods: absent.

Abdomen ( Figs. 20a, b ): 5 somites; somite 2 with 1 pair of dorsolateral processes directed anteriorly; somite 3 with 1 pair of dorsolateral processes directed ventrally; somites 1- 2 with rounded posterolateral processes and 3-5 with long posterolateral spinous processes; somite 1 without setae; somites 2-5 with 1 pair of posterodorsal setae; pleopod buds absent.

Telson ( Figs. 18c , 20a, b ): each fork long, gradually curved distally; 1 large and 1 smaller lateral spine; 1 large dorsal medial spine; posterior margin with 3 pairs of stout spinulate setae.

XANTHINAE MACLEAY, 1838

Figures

Fig. 17. Lybia plumosa Barnard, 1947 first stage zoea; a) anterior view of carapace; b) antennule; c) antenna; d) rostral spine.

Fig. 18. Lybia plumosa Barnard, 1947 first stage zoea; a) maxillule; b) maxilla; c) telson.

Fig. 19. Lybia plumosa Barnard, 1947 first stage zoea; a) first maxilliped; b) second maxilliped.

Fig. 20. Lybia plumosa Barnard, 1947 first stage zoea; a) dorsal view of abdomen; b) lateral view of abdomen.