Chlorodiella nigra (Forskål, 1775)

Al-Haj, Ahmed E., Kumar, A. A. J., El-Sherbiny, Mohsen M., Al-Sofyani, Abdulmohsin, Crosby, Michael P. & Al-Aidaroos, Ali M., 2019, Descriptions of the first zoeas of ten xanthid crabs (Crustacea: Decapoda Xanthoidea) from the Gulf of Aqaba, Red Sea, Zootaxa 4686 (3), pp. 301-345 : 310-317

Chlorodiella nigra (Forskål, 1775)

( Figs. 10–12 )

Zoea I. Size (mean ± sd): CW = 0.63 ± 0.01 mm; CL = 0.75 ± 0.01 mm; TT = 1.35 ± 0.03 mm.

Cephalothorax ( Fig. 10a ). Smooth; dorsal spine curved distally, sparsely spinulate, longer than rostral spine; rostral spine straight, spinulate, almost equal to antennal protopod; one pair of posterodorsal setae; ventral margin without setae; eyes sessile.

Antennule ( Fig. 10b ). Uniramous; endopod absent; exopod unsegmented with 4 terminal aesthetascs, one terminal seta.

Antenna ( Fig. 10c ). Bispinulate protopodal process, size of teeth increasing in size towards tip, approximately equal to rostral spine; endopod present; exopod approximately 17% length of protopod process with 2 (1 small subterminal, 1 small terminal) setae.

Maxillule ( Fig. 11a ). Coxal endite with 7 plumodenticulate setae; basial endite with 5 setae (4 cuspidate, 1 plu- modenticulate), one small tooth; endopod 2-segmented, proximal segment with distal seta, distal segment with 2+4 setae.

Maxilla ( Fig. 11b ). Coxal endite bilobed with 4+4 setae; basial endite bilobed with 5+4 setae; endopod bilobed with 3+5 setae; exopod (scaphognathite) margin with 4 setae, distal stout process.

First maxilliped ( Fig. 11c ). Basial endite with 10 setae arranged 2+2+3+3; endopod 5-segmented with 3,2,1,2,5 setae respectively; exopod 2-segmented, distal segment with 4 terminal plumose natatory setae.

Second maxilliped ( Fig. 11d ). Basial endite with 4 setae arranged 1+1+1+1; endopod 3-segmented, with 1,1,5 setae respectively; exopod bisegmented, distal segment with 4 terminal plumose natatory setae.

Pleon ( Fig. 12a ). Five somites; somite 2 with one pair of dorsolateral processes directed anteriorly; somite 3 with one pair of dorsolateral processes directed ventrally; posterolateral processes in somites 1 and 2 rounded; somites 3–5 with short posterolateral spinous processes; somite 1 without setae; somites 2–5 with one pair of posterodorsal setae.

Telson ( Fig. 12b ). Each fork gradually curved distally with 2 lateral and 1 medial spines; posterior margin with 3 pairs of stout spinulated setae.

Figures

FIGURE 10. Chlorodiella nigra Forskål, 1775zoea I; a) anterior view of cephalothorax; b) antennule; c) antenna.

FIGURE 11. Chlorodiella nigra Forskål, 1775zoea I; a) maxillule; b) maxilla; c) first maxilliped; d) second maxilliped.

FIGURE 12. Chlorodiella nigra Forskål, 1775zoea I; a) dorsal view of pleon; b) dorsal view of fork of telson.