What happened to the Selonian and Semigallian languages?

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Baltic languages The Baltic states: Estonia, Latvia, and Lithuania.

The Selonian and Semigallian languages were part of the Eastern Baltic group, which also includes modern Lithuanian and Latvian. These languages may have functioned as transitional forms between Lithuanian and Latvian.123

By the 16th century, the speakers of these languages had completely lost their distinct national identities and were assimilated by the Latvians and Lithuanians. Consequently, the Selonian and Semigallian languages became extinct, leaving behind no written records. Because they were never documented in writing, our knowledge of these extinct languages is extremely limited, consisting primarily of place-names.1