Plesionika ortmanni Doflein 1902

Plesionika ortmanni Doflein, 1902

(Fig. 2)

Zoea I. Size: CL, 0.40 mm (0.35-0.44 mm); TL, 2.47 mm (2.23-2.63 mm). (n = 10)

Carapace (Fig. 2A, B, D): Slightly dorsoventrally flattened; rostrum slightly curved and slender, shorter than antennular peduncle; dorsal anterior and posterior processes present; anteroventral margin bearing 1 strong pterygostomian spine and 1 denticle; eyes sessile.

Antennule (Fig. 2E): Peduncle unsegmented, slender and bearing 1 small tubercle; endopod with 1 long, plumose seta; exopod unsegmented with 1 spatulate seta, 3 aesthetascs, 1 plumose seta.

Antenna (Fig. 2F): Peduncle unsegmented with 1 sharp basal spine distally; endopod unsegmented, with 1 long plumose seta and 1 sharp, slender spine terminally; exopod 6-segmented, 9 plumose setae on inner margin, 1 seta on apex and 2 plumose setae on outer margin, 1 tubercle on first segment at proximal position in inner margin.

Mandible (Fig. 2G): Palp absent; right and left slightly asymmetrical, right incisor with 3 terminal teeth; left incisor with 4 teeth (1 subterminal + 3 terminal) and lacinia mobilis.

Maxillule (Fig. 2H): Coxal endite with 7 (2 simple subterminal + 5 terminal plumose) setae; basial endite with 2 strong, cuspidate setae and 3 simple setae; endopod unsegmented, with 6 setae forming 3 groups: basal group with 1 small, simple seta and 2 sparsely plumose setae; median group with 2 sparsely plumose setae; distal group with only 1 long sparsely plumose seta; exopod absent.

Maxilla (Fig. 2I): Coxal endite bilobed with 9 + 4 plumose setae; basial endite bilobed with 4 + 4 plumose setae; endopod with 9 (3 + 2 + 1 + 1 + 2) setae; scaphognathite margin with 5 plumose setae.

First Maxilliped (Fig. 2J): Coxa with 3 plumose setae; basis with 12 plumose setae; endopod 4-segmented with 3, 1, 2, 4 (1 outer + 3 terminal) setae; exopod unsegmented, armed distally with 4 (1+3) long, plumose natatory setae.

Second Maxilliped (Fig. 2K): Coxa with 1 plumose seta; basis with 9 plumose setae; endopod 4-segmented with 3, 1, 2, 5 (1 outer + 4 terminal) setae; exopod unsegmented, armed distally with 5 (2+3) long, plumose natatory setae.

Third Maxilliped (Fig. 2L): Coxa without setae; basis with 4 plumose setae; endopod 4-segmented with 2, 1, 2, 4 (1 outer + 3 terminal) setae; exopod unsegmented, armed distally with 5 (2+3) long, plumose natatory setae.

Pereiopods: Absent.

Pleon (Fig. 2A, C): With 5 somites, no spines or setae.

Pleopods: Absent.

Uropod: Absent.

Telson (Fig. 2A): Subtriangular, posterior margin with row of minute spinules as well as 7 + 7 plumose setae, outermost 2 pairs only plumose on inner margin.