Sacculinidae

The Sacculinidae are a family of barnacles belonging to the bizarre parasitic and highly apomorphic infraclass Rhizocephala. The Sacculinidae is one of the two larger families of Rhizocephala, containing six genera:
 * Drepanorchis Boschma, 1927
 * Heterosaccus Smith, 1906
 * Loxothylacus Boschma, 1928
 * Ptychascus Boschma, 1933
 * Sacculina Thompson, 1836
 * Sesarmaxenos Annandale, 1911