Plesionika crosnieri Chan & Yu 1991
Creators: name: Jiang, Guo-Chen
name: Landeira, José M.
name: Shih, Tung-Wei
name: Chan, Tin-Yam
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Pandalidae
Plesionika
Plesionika crosnieri

description: Plesionika crosnieri Chan & Yu, 1991
(Fig. 1)
Zoea I. Size: CL, 0.34 mm (0.27-0.48 mm); TL, 2.60 mm (2.44-2.97 mm). (n = 10)
Carapace (Fig. 1A, B, D): Slightly dorsoventrally flattened; rostrum slightly curved and slender, longer than antennular peduncle; dorsal anterior and posterior processes present; anteroventral margin bearing 1 strong pterygostomian spine and 3 denticles; eyes sessile.
Antennule (Fig. 1E): 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. 1F): 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 the first segment at proximal position in the inner margin.
Mandible (Fig. 1G): 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. 1H): Coxal endite with 7 (2 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; and distal group with only 1 long sparsely plumose seta; exopod absent.
Maxilla (Fig. 1I): 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. 1J): 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. 1K): Coxa without setae; 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. 1L): 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 (Figs. 1A, C): With 5 somites, no spines or setae.
Pleopods: Absent.
Uropod: Absent.
Telson (Fig. 1A): Subtriangular, posterior margin bearing row of minute spinules as well as 7 + 7 plumose setae, outermost 2 pairs only plumose on inner margin.
description: Published as part of Jiang, Guo-Chen, Landeira, José M., Shih, Tung-Wei & Chan, Tin-Yam, 2018, First zoeal stage of Plesionika crosnieri Chan & Yu, 1991, P. ortmanni Doflein, 1902, and P. semilaevis Bate, 1888, with remarks on the early larvae of Plesionika Bate, 1888 (Crustacea, Decapoda), pp. 385-395 in Zootaxa 4532 (3) on page 387, DOI: 10.11646/zootaxa.4532.3.4, http://zenodo.org/record/2615449