Haematobranchia
plural noun
Hae·ma·to·bran·chia
| \ ˌhēmətōˈbraŋkēə, ˌhem- \
Definition of Haematobranchia
in some classifications
: a division of arthropods consisting of the trilobites, eurypterids, and horseshoe crabs
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Merriam-Webster unabridged
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