Agononida squamosa ( Henderson, 1885 )

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 : 7-10

Agononida squamosa ( Henderson, 1885)

( Figs 5–6 )

Size: CL= 0.75 mm; EL= 0.60 mm.

Carapace ( Figs. 5 A,B). Typical galatheid larval form; without setae; rostrum elongated, surface with spinules; acute spines posteriorly, posterodorsal margin with 15 or 16 teeth and posteroventral margin with 17 or 18 teeth; eyes sessile and long, the EL more than 1/2 of CL.

Antennule ( Fig. 5 C). Uniramous, endopod absent, with 6 setae terminally (not completely extruded) and 1 long subterminal plumose setae.

Antenna ( Fig. 5 D). Biramous; protopod with 1 spinose process with 2 rows of spinules, probably shorter than endopod; endopod unsegmented, without setae and with sparse spines; exopod (scaphocerite) ending in process not completely extruded in any examined individuals, inner margin with 8 plumose setae and 1 simple seta.

Mandible. Similar to Neonida grandis , left and right mandibles developed molar processes strongly spinose; palp absent.

Maxillule ( Fig. 5 E). Setae not completely extruded, but clearly observable. Coxal endite with 7 sparsely plumose setae; basial endite with 5 setae (2 strong prominent cuspidate setae); endopod 2­segmented with 5 setae on distal segment (1 subterminal simple seta + 4 terminal setae).

Maxilla ( Fig. 6 A). Setae not completely extruded, but clearly observable. Coxal endite bilobed with 8+4 setae; basial endite bilobed with 5+4 setae; endopod unsegmented, bilobed, with 3 +4 setae and mat of microtrichia in outer margin; exopod (scaphognathite) lobe developed anteriorly only and with 4 marginal plumose seta and 1 long posterior plumose process.

First maxilliped ( Fig. 6 B). Setae not completely extruded, but clearly observable. Coxa with 2 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; exopod 2­ segmented with 4 terminal setae.

Second maxilliped ( Fig. 6 C). Setae not completely extruded, but clearly observable. Coxa without setae; basis with 3 sparsely plumose setae (1, 2) on anteroventral margin; endopod 4­segmented with 2,2,2,5 (1 subterminal + 4 terminal) setae; exopod 2­ segmented with 4 terminal setae.

Third maxilliped. Small unsegmented bud.

Pereiopods. Absent.

Abdomen. Five somites plus telson; somites 4 and 5 with posterolateral processes; somites 2–5 each with pair of posterodorsal setae and without denticles or teeth on posterior margin; pleopods absent.

Telson. Forked with median cleft; with 7+7 processes not completely extruded, first (lateralmost) immovable spine, second short plumose seta (anomuran hair), third to seventh bearing long, stout plumose setae and minute spinules.

Figures

FIGURE 5. Agononida squamosa (Henderson, 1885), first zoea. A, lateral view; B, dorsal view; C, antennule; D, antenna; E, maxillule. Scale bar of A and B = 0.5 mm; Scale bar of C­E = 0.1 mm.

FIGURE 6. Agononida squamosa (Henderson, 1885), first zoea. A, maxilla; B, 1 st maxilliped; C, 2 nd maxilliped. Scale bar = 0.1 mm.