Invasive Non-Native Crustacean Symbionts: Diversity and Impact

•We know little about the parasites that co-invade with invasive hosts.•There are a predicted 323 invasive crustaceans.•Only 31.2% of invasive crustaceans have one or more known symbionts.•Invasive symbionts/parasites pose variable threats to local ecosystems.•Some invasive parasites cause harm to wildlife, farming, human health, and the economy.•Other invasive parasites protect the local ecology by controlling the invasive populations.•Parasites need to be accounted for during invasion risk assessment.