The land crab
In this study, the first zoeal stage of
On September 24, 2009, a pair of
Sesarmops intermedius (De Haan, 1835)
First zoea (Fig. 1)
[Fig. 1.] First zoea of Sesarmops intermedius (De Haan, 1835). A, lateral view; B, antennule; C, antenna; D, mandibles; E, maxillule; F, maxilla; G, first maxilliped; H, second maxilliped; I, abdomen and telson, dorsal view. Scale bars = 0.1 mm.
RDL, 0.79 (0.70–0.84) mm; CL, 0.53 (0.52–0.54) mm.
Carapace (Fig. 1A). With dorsal and rostral spines; lateral spine absent; dorsal spine slightly curved, as long as the rostral spine; rostral spine slightly longer than the protopod of the antenna; eyes unstalked.
Antennule (Fig. 1B). Uniramous, with three aesthetascs and one simple seta.
Antenna (Fig. 1C). Protopod tapered, slightly shorter than rostral spine, with two rows of small spinules; exopod with two terminal setae.
Mandibles (Fig. 1D). Asymmetrical; left mandible with teeth between incisor and molar processes; right mandible unarmed in that site.
Maxillule (Fig. 1E). Coxal endite with five setae; basal endite with five setae; endopod two-segmented, with one seta on proximal segment and five (one subterminal, four terminal) setae on the distal segment.
Maxilla (Fig. 1F). Coxal endite bilobed, with 2+6 setae; basal endite bilobed with 5+4 setae; endopod bilobed with 2+3 setae; scaphognathite with four marginal setae and one long posterior process.
First maxilliped (Fig. 1A, 1G). Basis with 10 setae arranged 2,2,3,3; endopod five-segmented, with 2,2,1,2,5 (one subterminal, four terminal) setae; exopod with four terminal natatory setae.
Second maxilliped (Fig. 1A, 1H). Basis with four setae arranged 1,1,1,1; endopod three-segmented, with 0,1,6 (one subterminal, five terminal) setae; exopod with four plumose natatory setae.
Abdomen (Fig. 1A, 1I). Composed of five somites; second to fifth somites with a pair of small setae postero-dorsally; second somite with pair of forward-directed dorsolateral processes; third somite with pair of backward-directed dorsolateral processes; pleopods not developed.
Telson (Fig. 1I). Bifurcated, with three pairs of serrate setae on posterior margin, with fine spinnules on inner and outer margin of fork.
Chromatophores. Blackish brown chromatophores present on overall surface of carapace, dorsal carapace spine, base of antennule, antenna, dorsal spine and rostral spine, optic and median ocular center, labrum, mandible, maxilla, basis of first and second maxillipeds, and on second to fifth abdominal somites and telson.
Baba and Fukuda (1975) described the first zoea of
[Table 1.] Morphological differences between the description of the first zoea of Sesarmops intermedius given by Baba & Fukuda (1975), Terada (1976) and that obtained in the present study
Morphological differences between the description of the first zoea of Sesarmops intermedius given by Baba & Fukuda (1975), Terada (1976) and that obtained in the present study
A detailed comparison of the first zoeae of four sesarminid crabs—
[Table 2.] Comparison of the first zoeal characteristics of four species in the Sesarmidae
Comparison of the first zoeal characteristics of four species in the Sesarmidae