Diving this past weekend at Anilao, it must have been the right moon phase, as we came across three interesting examples of of reproduction (I think).
The first was on a vertical section of reef at about 12 m. There was a group of six conch shells (I've only ever seen one at a time) that I think were trapezius or horse conch. It was hard to be sure as they were so encrusted and since I had a macro lens mounted and the vis was not great I could not take a usable shot of one of them or of the group. Under a small overhang was a cluster of what might be egg cases. Can anyone confirm?



Continuing the theme, shortly thereafter we came upon a pair of egg cowries, this time a bit shallower at about 6 m. I think they were also depositing eggs:

Then finally, I came across this transparent shrimp obviously bearing eggs, which I post just to round out the theme:

Expert opinions on the two shells and links to learn more would be much appreciated.