Heterosaccus is a genus of barnacles in infraclass Rhizocephala. Like other taxa in this group, they parasitize crabs. Geoffroy Smith circumscribed the genus in 1906; he initially only included H. hians. Smith circumscribed a genus distinct from Sacculina due to a difference of the mesentery; in Heterosaccus, the mesentery does not stretch down to the mantle opening but rather only is present on the ring of attachment.
, WoRMS recognizes the following fifteen species.
| Binominal name (Original combination) | Ref | ||||
|---|---|---|---|---|---|
| Heterosaccus californicus | "Pugettia producta" | "Santa Cruz, California" | |||
| Heterosaccus distortus | "Schizophrys aspera" | "vicinity of Jolo," Philippines | |||
| Heterosaccus dollfusi | "Charybdis hoplites" | "Gulf of Suez" | |||
| Heterosaccus gongylus | Pleistacantha moseleyi | apud WoRMS | |||
| Heterosaccus hians (Sacculina hians) | "Thalamita sp. aff. callianassae" | "Java" | |||
| Heterosaccus indicus | "Portunus pelagicus" | Mandapam Camp, Tamil Nadu | apud WoRMS | ||
| Heterosaccus lunatus | "Charybdis callianassa" | "Moreton Bay," Queensland | |||
| Heterosaccus multilacinensis | "Charybdis truncata" | "East Moreton Bay," Queensland | |||
| Heterosaccus occidentalis (Drepanorchis occidentalis) | "Mithrax forceps" (=Mithraculus forceps) | "Deadman's Bay, west coast of Florida" | |||
| Heterosaccus papillosus (Drepanorchis papillosa) | "Charybdis bimaculatus" (=Charybdis bimaculata) | "vicinity of Marindugue Island, Philippine Islands" | |||
| Heterosaccus pellucidus | "Thalamita integra integra" | Japan | apud WoRMS | ||
| Heterosaccus ruginosus | "Thalamita prymna" | "Singapore, coral reef" | |||
| Heterosaccus setoensis | "Thalamita wakensis" (= Thalamita seurati) | apud WoRMS | |||
| Heterosaccus sibogae | "Thalamita admeta" (= Thalamita admete) | "Siau Reef", Indonesia | |||
| Heterosaccus tesselatus (Sacculina tessellata) | "Mithrax ruber" (= Teleophrys ruber) | "Caracas Bay, Curaçao" |