Reproduction of Mollusks
Distinct male and female, but some snails are hermaphroditic
Sea slugs and oysters can change sex repeatedly
External fertilization in most aquatic mollusks
Internal fertilization in terrestrial snails
Trochophora: free-swimming larvae of marine mollusks (also characteristic for other phyla of the “Lophotrochozoa”
Veliger larvae: older stage, differentiation of shell and foot