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Manual of Nearctic Diptera has a key to families of larvae and a description of first instar Sarcophagidae larvae. This should be accurate in Germany too. Sarcophagidae is mostly a New World family and as far as I know all European Sarcophagidae belong to holarctic genera.

http://www.esc-se...fcmono.php
Volume 1 has keys to families. Volume 2 has the family treatment for Sarcophagidae.