Trochophore larva suggest common ancestory b/w
Mollusca and Arthropoda
Mollusca and Annelida
Arthropoda and Annelida
Arthropoda and Cnidaria
As we have learned
Development in Mollusca -
Fertilization is generally external and development is mostly indirect.
- wherein
When indirect, includes a characteristic larva, veliger / trochophore / glochidium.