Chirostylidae Ortmann, 1892

Guerao, Guillermo, Macpherson, Enrique, Samadi, Sarah, Forges, Bertrand Richer De & Boisselier, Marie-Catherine, 2006, First stage zoeal descriptions of five Galatheoidea species from Western Pacific (Crustacea: Decapoda: Anomura), Zootaxa 1227, pp. 1-29 : 14-18

Chirostylidae Ortmann, 1892

The morphology of the first zoeae of Eumunida annulosa and E. capillata are similar and display few variations between species. The following description is based on E. annulosa but also applies to E. capillata except where noted.

Size: TL 2.9–3.1 mm, CL 1.1–1.2 mm, CLR 1.7–1.8 mm.

Carapace ( Figs. 12 A, B). Rostrum well developed, extending beyond of scaphocerite spine and shorter than CL; posterolateral margins rounded, without spines and denticles or teeth; without setae; eyes sessile, EL less than 1/2 of CL.

Antennule ( Fig. 13 A). Unirramous, endopod absent, with 6 terminal aesthetascs and 1 long subterminal plumose seta.

Antenna ( Fig. 13 B). Biramous; protopod with 1 spinose process covered with spines, slightly longer than endopod; endopod unsegmented, fused to protopod, with 2 long terminal plumose setae unequal in length; exopod (scaphocerite) ending in robust process at distal margin, inner margin with 9­10 plumose setae and 1 simple seta.

Mandible (Fig. 14A–C). Left and right mandibles developed and asymmetrically dentate, with 1 and 2 strong incisor processes respectively, and few small processes; in E. capillata inner processes shorter than in E. annulosa (see Fig. 14B and C); molar processes strongly spinose; palp absent.

Maxillule ( Fig. 15 A). Coxal endite with 7 setae (5 plumose and 2 simple setae); basal endite with 4 setae (2 strong prominent cuspidate setae with 3­7 denticles and 2 plumodenticulate setae); endopod 3­segmented with 2 small simple setae on proximal segment, 1 seta on second segment and 3 setae on distal segment.

Maxilla ( Fig. 15 B). Coxal endite bilobed with 8+4 plumose setae; basial endite bilobed with 5+4 plumodenticulate setae; endopod unsegmented, bilobed, with 3 (1 minute and 2 long)+6 (2+4) setae; exopod (scaphognathite) lobe developed anteriorly and with 5 marginal plumose setae, without long posterior process.

FIGURE Munida javieri Macpherson, 1994 , first zoea. A,. A, abdomen, lateral view; B, abdomen, dorsal view; C, telson. Scale bar = 0.5 mm.

First maxilliped ( Fig. 16 A). Coxa without setae; basis with 11 (2,3,3,3) sparsely plumose setae on ventral margin; endopod 5­segmented with 3,2,1,2,5 (1 subterminal + 4 terminal) setae, mat of long microtrichiae on segments 2 and 3; exopod 2­segmented with 4 long terminal plumose setae.

Second maxilliped ( Fig. 16 B). Coxa without setae; basis with 3 sparsely plumose setae (1,2) on ventral margin; endopod 4­segmented with 2,2,2 (1 strong spine with spinules + 1) setae, 5 (1 subterminal + 4 terminal) setae, mat of long microtrichiae on segment 2­3; exopod 2­segmented with 4 long terminal plumose setae.

Third maxilliped ( Fig. 17 A). Small unsegmented bud.

Pereiopods. Absent

Abdomen ( Figs 12 A, B). Five somites plus telson; segments 3–5 with posterolateral processes; segments 2–5 each with pair of posterodorsal setae; without denticles or teeth on posterior margin; pleopods absent.

Telson ( Figs 12 B, 17B). Trigonal in dorsal view, posterior margin slightly convex, median gap slightly notched, and with non­articulated spine (shorter than plumose setae), 1 short plumose seta (anomuran hair), shorter than spine, and 5 long plumose setae with spinules on each side.

Figures

FIGURE 12. Eumunida annulosa de Saint Laurent and Macpherson, 1990, first zoea. A, lateral view; B, dorsal view. Scale bar = 0.5 mm.

FIGURE 13. Eumunida annulosa de Saint Laurent and Macpherson, 1990, first zoea. A, antennule; B, antenna. Scale bar = 0.1 mm.

FIGURE 15. Eumunida annulosa de Saint Laurent and Macpherson, 1990, first zoea. A, maxillule; B, maxilla. Scale bar = 0.1 mm.

FIGURE 16. Eumunida annulosa de Saint Laurent and Macpherson, 1990, first zoea. A, 1 st maxilliped; B, 2 nd maxilliped. Scale bar = 0.1 mm.

FIGURE 17. Eumunida annulosa de Saint Laurent and Macpherson, 1990, first zoea. A, 3 rd maxilliped; B, telson. Scale bar = 0.1 mm.