Biology of Finfish and Shellfish

4.12.2. Nauplius I

4.12.2. Nauplius

MTL: 0.30 mm (0.28 - 0.31 mm); MW: 0.17 mm (0.15-0.17 mm); MFS: 0.13 mm (0.11-0.14 mm). An ocellus present at anterior median region of body, dorsal surface of body bears posteriorly a small median denticle a pair of dorsally curved caudal setae present at posterior end of body, 3 pairs of appendages present; A1 uniramous, with 2 long setae of almost same length and a small rudimentary spine-like seta at its apex, 2 short setae on inner distal margin and one long seta on outer distal margin; A2 biramous, endopod shorter than exopod, bearing 2 long setae and one rudimentary seta at apex, and 2 short setae along inner margin, exopod carries 5 long setae along inner margin and tip; Md biramous, shorter than other appendages, bearing 3 long setae on endopod and exopod; setae of appendages nonplumose. Duration of this substage was 4to 4 hours.