SINCE 1828
Gigantostraca
plural noun
Gi·gan·tos·tra·ca
| \(ˌ)jīˌgan‧ˈtästrə̇kə, jə̇ˌg-\
Definition of Gigantostraca
: a group of arthropods comprising the eurypteroids and sometimes related forms including the xiphosurans — compare merostomata
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