Barnacles in corals

[rshimek]

Hi,

Your question is really impossible to answer; there are simply too many types of organisms covered in the phrase "smaller non-colonial sessile inverts" to form a coherent answer.

Specifically, barnacles reproduce only sexually. They have a long lived larvae which may (or may not - it depends on the species) be able to travel great distance prior to settlement.

A point of order as well, although reproduction in some corals (not all) may show timing correlated to lunar periodicity, it is likely actually cued by tidal changes and temperature variations than lunar illumination.