Abstract
The spawning and larval development of Tegula euryomphala (Jones, 1844) were studied under laboratory conditions. The release of gametes was stimulated by raising temperature from 16 to 19 °C, and could be induced during several months of the year. Males always spawned first. Eggs were 155.6 μm in diameter and remained unattached to each other. Development was similar to that described for other Trochoidea and lasted 3–5 days at 19 °C. Larvae hatched approximately 24 h post-fertilization at the pre-torsional veliger stage. The larval protoconch of the metamorphic veliger measured 247 μm and was ornamented with six spiral threads and weakly ordered granulation. Larvae metamorphose without any natural substratum.
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