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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Merriam-Webster unabridged
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