The first zoea of Inachus aguiarii, Inachus communissimus and Ergasticus clouei (Decapoda, Brachyura, Majoidea) with implications for the systematics of the family Inachidae Author Guerao, Guillermo Author Abelló, Pere text Zootaxa 2007 1429 55 68 journal article 10.5281/zenodo.175774 df8f4977-e55b-4852-a215-ddfd2911944c 1175-5326 175774 Inachus communissimus Rizza, 1839 ( Figs 3–4 ) Size: ds= 0.71± 0.02 mm ; cl= 0.62± 0.03 mm ; n= 8. Carapace ( Fig. 3 a–c). With long dorsal spine, curved distally backwards, armed with minute spinules; rostral and lateral spines absent; with fronto-median elevation; postero-lateral margin with 6–8 minute denticles; each latero-ventral margin with one densely plumose “anterior seta”; one pair of antero-dorsal setae and one pair of postero-dorsal setae present; eyes sessile. Antennule ( Fig. 3 d). Uniramous, unsegmented, smooth and conical; endopod absent; exopod unsegmented with 4 terminal aesthetascs and 0–1 seta. FIGURE 1. Inachus aguiarii . Zoea I. a, carapace; b, detail of the dorsal spine; c, detail of the lateral margin of the carapace; d, antennule; e, antenna; f, abdomen, dorsal view; g, detail of the telson. Scale bar of a = 0.6 mm; scale bar of d–f = 0.1 mm. FIGURE 2. Inachus aguiarii . Zoea I. a, maxillule; b, maxilla; c, first maxilliped; d, second maxilliped. Scale bars = 0.1 mm. FIGURE 3. Inachus communissimus . Zoea I. a, carapace; b, detail of the dorsal spine; c, detail of the lateral margin of the carapace; d, antennule; e, antenna; f, abdomen, dorsal view; g, detail of the telson. Scale bar of a = 0.6 mm; scale bar of d–f = 0.1 mm. FIGURE 4. Inachus communissimus . Zoea I. a, maxillule; b, maxilla; c, first maxilliped; d, second maxilliped. Scale bars = 0.1 mm. Antenna ( Fig. 3 e). Biramous, protopod very long (spinous process) with two rows of 15–16 spinules; endopod bud approximately 1/3 the size of spinous process; one-segmented exopod equal in length to the spinous process, distally spinulated, with two small midpoint setae. Mandible. Incisor and molar processes differentiated; mandibular palp (endopod) absent. Maxillule ( Fig. 4 a). Coxal with seven setae; basial endite with seven setae; endopod two-segmented, proximal segment without setae, distal segment with four terminal setae; exopod seta absent. Maxilla ( Fig. 4 b). Coxal endite bilobed with 4+3 setae; basial endite bilobed with 5+4; unsegmented endopod not bilobed, with four terminal setae and microtrichia on lateral margin; exopod (scaphognathite) margin with 11 plumose setae, including distal process. First maxilliped ( Fig. 4 c). Coxa with one seta; basis with nine setae arranged 2+2+2+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 long plumose natatory setae. Second maxilliped ( Fig. 4 d). Coxa and basis without seta; endopod three-segmented with 0,1,4 setae, respectively; exopod incipiently two-segmented, distal segment with 4 long plumose natatory setae. Third maxilliped. Present as small buds. Pereiopods. Present as small buds, chela bilobed. Abdomen ( Fig. 3 f). With five somites; somite 2 with one pair of dorso-lateral processes directed anteriorly; somites 3–5 with a pair of postero-lateral processes; somite 1 without setae, somites 2–5 with one pair of postero-dorsal setae; incipient pleopod buds on somites 2–5. Telson ( Fig. 3 f, g). Telson fork with one pair of lateral spines and distally spinulated; inner margin with three pairs of serrulate setae.