Antarcticarcinus is an extinct genus of late Carboniferous (Gzhelian) to early Permian (Asselian) euthycarcinoids from the Pagoda Formation of Antarctica.

[1] Antarcticarcinus was at least 4 cm long (the most complete fossil only preserves the head and postabdomen).

The genus is remarkable for the unusual "wings" on its first preabdominal segment, which immediately distinguish it from any other euthycarcinoid.

It is also one of the few euthycarcinoids which deviates from the typical body shape, alongside Arthrogyrinus which shows a particularly flattened tail.

[1] Antarcticarcinus derives from the Greek karkinos meaning "crab", and Antarctica, the location of the fossils.