Chlorodiella cytherea

Chlorodiella cytherea (Dana, 1852)

(Figs. 4–6)

Zoea I. Size (mean ± sd): CW = 0.6 ± 0.01 mm; CL = 0.68 ± 0.01 mm; TT = 1.3 ± 0.03 mm.

Cephalothorax (Fig. 4a). Dorsal spine long, straight, curved distally, sparsely spinulated, longer than rostral spine; rostral spine straight, shorter than protopod of antenna; lateral spines short; ventral margin without setae; one pair of posterodorsal setae; eyes sessile.

Antennule (Fig. 4b). Uniramous; endopod absent; exopod unsegmented with four broad, one long aesthetascs, one slender terminal seta.

Antenna (Fig. 4c). Protopodal process distally multispinulate, longer than rostral spine; endopod bud present; exopod small, 7% length of protopod, one terminal seta.

Maxillule (Fig. 5a). Coxal endite with 7 plumodenticulate setae; basial endite with 5 (2 cuspidate, 3 plumodenticulate) setae; endopod 2-segmented, proximal segment with one simple seta, distal segment with 2+4 setae; exopod setae absent.

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

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

Second maxilliped (Fig. 5d). Basial endite with 4 simple setae arranged 1+1+1+1; endopod 3-segmented with 1,1 (plumose), 5 setae. Exopod 2-segmented, distal segment with 4 terminal plumose natatory setae.

Pleon (Fig. 6a). Five somites; somite 2 with one pair of dorsolateral processes directed anteriorly; somite 3 with one pair of dorsolateral processes directed posteriorly; somites 1 and 2 with rounded posterolateral process; somites 3–5 with short posterolateral spinous processes; somite 1 without setae; somites 2–5 each with one pair of posterodorsal setae.

Telson (Fig. 6b). Each fork gradually curved distally with 2 lateral and 1 medial spines; inner margin with 3 pairs of stout spinulate setae.