Approximate relative duration of developmental stages in Nerophis, Syngnathus, and Hippocampus. Stage lengths between fertilisation (0%) and release (100%) are estimated for N. lumbriciformis (average developmental time: 30 days, water temperature: 14-15°C; ), S. abaster (28 days, 18-19°C; ), H. guttulatus and H. brevirostris (21 days, 23°C; ), and H. kuda (25 days, 24-29°C; ); stage-length estimates for Hippocampus are averaged across the two publications. Note that zygote stages (usually a few hours), early cleavages and the embryonic-shield stage in Hippocampus, and the ventral-jaws stage in Nerophis are not shown, as information on the duration of these stages was not available from the original publications.
Sommer et al. BMC Developmental Biology 2012 12:39 doi:10.1186/1471-213X-12-39