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This creature appears perfectly adapted to doing what it does. Mudskippers have been mudskippers for as long as we know.



Of course it's adapted to doing what it does, otherwise it would have been removed by natural selection and we wouldn't have a fossil.

You're evading the issue. You first told that there were no transitional fossils, then we show you transitional fossils, and now you're telling us that those fossils are not transitional because they are adapted to doing what they do.

A species is transitional when it's just between two other species in time as well as in a certain feature, as in the above case the fin -> leg transition.