sertularian

ser·tu·lar·ian (sʉr′tyo̵̅o̅ ler′ē ən)

noun

any of a family (Sertulariidae) of hydroids growing in colonies made up of double-rowed branches of cupped polyps

Etymology: < ModL Sertularia < L sertula, dim. of serta, garland < fem. pp. of serere, to join together (see series) + -an

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