Larval ecology of deep-sea snails
There follows a 2-column table. The first column contains a picture. The second contains descriptive text.
A puzzle: if they can't crawl on mud, how do they move so far?
Ahna is investigating a conundrum: Bathynerita naticoidea snails can only crawl on hard substrate (e.g. on mussel shells). They cannot crawl on the mud or sediment that separates the seep sites, sometimes up to 20 kilometers apart, because the mud clogs the snail's gill. So how did the snails distribute throughout the region? Although it was believed that the snail develops from an embryo directly into a juvenile snail instead of a swimming larva, Ahna decided to take a closer look.