Fig. 3

Naupliar instars of Sacculina carcini, Thompson, 1836 from N1 to N5 (N2 male and N3–N5 female), scanning electron micrographs: a, e, i, m and q body shape in ventral view. Scale bar 50 μm; b, f, j, n and r: frontal horns. Double tip indicate anterior spine. Arrowheads indicate discrete grooves separating the horns in three portions. Scale bar 5 μm; c, g, k, o and s: antennular setation. Black arrow indicates a small tip at the basis of S5. Scale bar 5 μm; d, h, l, p and t: ventral views of telson with furcal rami. Large arrows indicate the tubercle between furcal rami. Little arrows show the notches with spine. Scale bar 10 μm