I've always thought shellfish were ancient, like they have been around since the dinosaurs or something.
I bet shellfish back then were much larger than they are now. T-rex was just a glorified reptile after all.
It sort of validates my theory because shellfish are part the crustacean family and they have been around for 8 millennia.
The sea is vast, so it's there are plenty undiscovered shell fish probably in the deep ocean.
That is very interesting. Believe it or not but many varieties of shellfish are closely related to insects and arachnids(spiders), making them close to the main classes of Arthropodas.
Hold on! How is that even possible. Shellfish don't even have legs like insects of any kind.
I don't think it's mainly about legs or anything. But it's that arthropods have invertebrates and exoskeletons segmented bodies sort of like spiders, so I think that's the distinction.
I just find it amusing that shellfish just one day decides to just take their shell off and started walking on to land.