Redescription of the leptothecate hydroid Halecium macrocephalum Allman, 1877 (Cnidaria: Hydrozoa)

W. Vervoort, L.-A. Henry, M. S. Nizinski

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Hydroids are a species-rich component of the benthic fauna inhabiting deep, cold-water coral habitats. Fertile colonies of the leptothecate species Halecium macrocephalum Allman, 1877 collected from cold-water coral habitats off the southeastern USA exhibited morphologically peculiar male gonophores, distinct from those described and illustrated for the holotype. We redescribe H. macrocephalum based on this new material, and consider the gonophores of the holotype to be either damaged or immature. Following re-examination of non-type material (the holotype being lost), we characterize H. macrocephalum as a strictly subtropical western North Atlantic bathyal species, occurring between North Carolina and Florida, the Straits of Florida inclusive of the Bahamas, and the eastern Gulf of Mexico including the Tortugas. This study also provides a taxonomic distinction between H. macrocephalum and its morphologically similar Southern Ocean congener, Halecium jaederholmi Vervoort, 1972.

Original languageEnglish
Pages (from-to)33-34
Number of pages2
JournalJournal of Natural History
Issue number33-34
Publication statusPublished - Sept 2011

Keywords / Materials (for Non-textual outputs)

  • Cold-water corals
  • Haleciidae
  • Hydroids


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