Pilumnus longicornis Hilgendorf, 1879

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 : 361

Pilumnus longicornis Hilgendorf, 1879

( Figs. 33-36 )

Pilumnus longicornis – Prasad & Tampi, 1957: 26-28, Fig. 3 a-h, zoea I.?

Pilumnus longicornis – Hashmi, 1970a: 423-424, Figs. 8-10 , zoea I.

Larval description. – Carapace ( Fig. 33a ): dorsal spine smooth, curved distally, slightly longer than rostral spine; rostral spine smooth, slightly shorter than dorsal and antennal protopod; lateral spines long and unarmed; 1 pair of posterodorsal setae; ventral margin without setae, eyes sessile.

Antennule ( Fig. 33b ): uniramous, endopod absent; exopod unsegmented with 2 broad and long, 2 shorter and slender aesthetascs plus 2 terminal setae of unequal length.

Antenna ( Fig. 33c ): protopod distally bilaterally spinulate, longer in length than rostral spine but equal in length to exopod; endopod absent; exopod equal in length to the protopod, unsegmented, distally spinulate with 1 long and 1 smaller medial setae unequal in length.

Mandible: endopod palp absent. Maxillule ( Fig. 34a ): epipod seta absent; coxal endite with 7 setae; basial endite with 5 terminal 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. 34b ): coxal endite bilobed with 6+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. 35a ): coxa without setae; 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. 35b ): coxa without setae; basis with 4 setae arranged 1,1,1,1; endopod 3-segmented, with 1,1,6 (3 subterminal, 3 terminal) setae respectively; exopod 2- segmented, distal segment with 4 long terminal plumose natatory setae.

Third maxilliped: absent.

Pereiopods: absent.

Abdomen ( Figs. 36a, b ): 5 somites; somite 2 with a pair of dorsolateral processes directed anteriorly; somite 3 with a pair of dorsolateral processes directed ventrally; somites 1- 2 with rounded posterolateral processes and 3-5 with short posterolateral spinous processes; somite 1 without dorsal setae; somites 2-5 with 1 pair of posterodorsal setae; posterior margin of somites 2-5 spinulate; pleopod buds absent.

Telson ( Figs.34c , 36a, b ): each telson fork long, spinulate and gradually curved distally; 1 long and 1 small lateral spine; dorsal medial spine present; posterior margin with 3 pairs of stout spinulate setae.

Figures

Fig. 33. Pilumnus longicornis (Hilgendorf, 1878) first stage zoea; a) anterior view of carapace; b) antennule; c) antenna.

Fig. 34. Pilumnus longicornis (Hilgendorf, 1878) first stage zoea; a) maxillule; b) maxilla; c) telson.

Fig. 35. Pilumnus longicornis (Hilgendorf, 1878) first stage zoea; a) first maxilliped; b) second maxilliped.

Fig. 36. Pilumnus longicornis (Hilgendorf, 1878) first stage zoea; a) dorsal view of abdomen; b) lateral view of abdomen.

Fig. 3. Eriphia scabricula Dana, 1852 first stage zoea; a) first maxilliped; b) second maxilliped.

Fig. 8. Epixanthus frontalis (H. Milne Edwards, 1834) first stage zoea; a) dorsal view of abdomen; b) lateral view of abdomen.

Fig. 9. Lydia annulipes (H. Milne Edwards, 1834) first stage zoea; a) anterior view of carapace; b) antennule; c) antenna.

Fig. 10. Lydia annulipes (H. Milne Edwards, 1834) first stage zoea; a) maxillule; b) maxilla; c) telson.