||P.2702 right column bottom paragraph: "Within 7–16 h after fertilisation, the first larval stage to exhibit controlled movement is the ciliated gastrula (Table 1). LaBarbera (1974) and Jameson (1976) recorded active rotation within the water column by the gastrulae of numerous species, while those of H. hippopus remained on the bottom of the rearing tank (Fitt et al. 1984). Trochophores develop by 24 h post-fertilisation (Jameson 1976 Tan and Yasin 2001a) and are free-swimming and active (Fitt et al. 1984 Alcazar and Solis 1986). Cone-shaped T. squamosa trochophores have been observed swimming in a spiralling motion (LaBarbera 1974), and such locomotion may be facilitated by the presence of apical flagella on the anterior end (Raven 1966 Carriker 1990). Trochophore larvae do not orientate towards light (Fitt et al. 1984)."