Embryonic, Larval, and Early Juvenile Development of the Tropical Sea Urchin, Salmacis sphaeroides (Echinodermata: Echinoidea)
Table 2
Larval developmental events of S. sphaeroides. Three replicate fertilization experiments were conducted and for each developmental stage, 10 embryos from each replicate were used for the observation and measurement of larvae.
Time after insemination
Developmental stages
Length (μm)
16.15 h
Gastrula
178.71 ± 5.52
22.25 h
Prism
181.56 ± 3.99
34.00 h
2-arm pluteus
233.01 ± 10.51
48.00 h
4-arm pluteus
364.72 ± 6.57
10.00 d
6-arm pluteus
545.62 ± 10.72
16.00 d
8-arm pluteus
716.85 ± 9.99
28.00 d
Precompetent larva with ciliated ring and growing rudiment
