Here's an blog post/article in my files from a year or two back that might be of interest to some. Focused on taxonomy of giant clams and their range across the Red Sea and the Indian Ocean, and explains some of the limitations of their spread.
Cheers,
Ray
The Mystery of the Giant Clams of the Red Sea and Indian Ocean
The Mystery of the Giant Clams of the Red Sea and Indian Ocean
A mystery solved by science: a new type of giant clam in the Indian Ocean, unmasked!
dantheclamman.blog
Cheers,
Ray