Ergasticus clouei A. Milne-Edwards, 1882

Guerao, Guillermo & Abelló, Pere, 2007, The first zoea of Inachus aguiarii, Inachus communissimus and Ergasticus clouei (Decapoda, Brachyura, Majoidea) with implications for the systematics of the family Inachidae, Zootaxa 1429, pp. 55-68 : 62-65

Ergasticus clouei A. Milne-Edwards, 1882

( Figs 5–6 )

Size: rdl= 2.50± 0.04 mm; ds= 1.34± 0.03 mm; cl= 0.97± 0.01 mm; cw= 1.50± 0.02 mm; n=4.

Carapace ( Fig. 5 a). With long, naked dorsal spine, strongly curved distally backwards; rostral spine long sligthly longer than antenna; lateral spines present and well developed; each latero-ventral margin with one densely plumose “anterior seta”, followed by two additional sparsely plumose setae; one pair of antero-dorsal setae and one pair of postero-dorsal setae present; eyes sessile.

Antennule ( Fig. 5 d). Uniramous, smooth and conical; endopod absent; exopod unsegmented with 4 terminal aesthetascs and one minute seta.

Antenna ( Fig. 5 e). Biramous, protopod very long (spinous process) with one row of spinules of different size; endopod bud approximately 1/3 the size of spinous process; one-segmented exopod shorter than the spinous process, with 2 unequal subterminal setae.

Mandible. Incisor and molar processes differentiated; mandibular palp (endopod) absent.

Maxillule ( Fig. 6 a). Coxal endite with seven setae; basial endite with seven setae (three cuspidate); endopod two-segmented, proximal segment with one seta, distal segment with two subterminal and four terminal setae; exopod seta absent.

Maxilla ( Fig. 6 b). Coxal endite bilobed with 4+4 setae; basial endite bilobed with 5+4; unsegmented endopod not bilobed, with six terminal setae and microtrichia on lateral margin; exopod (scaphognathite) margin with 9 plumose setae, including distal process.

First maxilliped ( Fig. 6 c). Coxa with one seta; basis with ten setae arranged 2+2+3+3; endopod five-segmented with 3,2,1,2,5 (one subterminal and four terminal) setae, respectively; exopod incipiently two-segmented, distal segment with 4 setae.

Second maxilliped ( Fig. 6 d). Coxa without seta; basis with 3 setae; endopod three-segmented with 0,1,6 setae, respectively; exopod incipiently two-segmented, distal segment with 4 setae.

Third maxilliped. Present as small buds.

Pereiopods. Present as small buds.

Abdomen ( Fig. 5 b). With five somites; somite 2 and 3 with one pair of dorso-lateral processes; somites 3– 5 with a pair of short postero-lateral processes; somite 1 without setae, somites 2–5 with one pair of posterodorsal setae; pleopods absent.

Telson ( Figs. 5 b,c). Telson fork with one pair of lateral and two pairs of dorsal spines; inner margin with three pairs of serrulate setae.

Figures

FIGURE 5. Ergasticus clouei. Zoea I. a, carapace; b, abdomen, dorsal view; c, detail of the telson; d, antennule; e, antenna. Scale bar of a and b = 0. 6 mm; scale bar of d and e = 0. 1 mm.

FIGURE 6. Ergasticus clouei. Zoea I. a, maxillule; b, maxilla; c, first maxilliped; d, second maxilliped. Scale bar of a and b = 0. 1 mm; scale bar of c and d = 0. 4 mm.