hydroid

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hydroid

a member of the COELENTERATE class Hydrozoa. Most are colonial forms which grow in the marine environment on rocks and seaweeds, such as Obelia. Usually, there is an ALTERNATION OF GENERATIONS (not in HYDRA) in which the MEDUSA (free-swimming) stage carries the sex organs. The sedentary, nonsexual stage of this life cycle is itself referred to as the POLYP or (less commonly) hydroid stage.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
The serpulids Hydroides and Neodexiospira species dominated with occasional occurrences of different species of syllids.
Qian, "Induction of larval attachment and metamorphosis in the serpulid polychaete Hydroides elegans by dissolved free amino acids: Mode of action in laboratory bioassays," Marine Ecology Progress Series, vol.
and Polymastia sp.; large anemones (Metridium senile, Tealia sp., or Stomphia careola); various hydroids (Tubularia sp., Obelia sp., Campanularis sp.); northern stone coral, soft coral (Alcyonaria sp.) off New England, and sea whips (Leptogorgia sp.) south of New Jersey where it becomes part of a "live bottom" community that is most common south of Virginia; barnacles; blue mussels, horse mussels Modiolus modiolus in deeper and cooler waters off southern New England; the jingle shell Anomia simplex; bryozoans, including Bugula sp.; skeleton (caprellid) and tubiculous amphipods, such as Jassa falcata; and tubiculous polychaetes, such as Sabellaria vulgaris and Hydroides dianthus.
Habitat selection by larvae of the hydroid Tubularium crocea, the bryozoans Bugula turrita and Schizoporella unicornis, and the tube-building polychete Hydroides dianthus were studied in manipulated field flows in Great Harbor, Massachusettes, USA (Mullineaux and Garland 1993).
For example, the polychaete Hydroides elegans (Haswell, 1883) settles and metamorphoses when in direct contact with the substratum, whereas larvae just 1 mm away show no response (Hadfield et al.
Radiolar eyes not reported in Bathyditrupa, Bathyvermilia, Chitinopoma, Chitinopomoides, Ditrupa, Ficopomatus, Filograna, Filogranula, Filogranella, Floriprotis, Galeolaria, Hyalopomarus, Hydroides, Josephella, Laminatubus, Marifugia, Neomicrorbis, Omphalopomopsis, Paumotella, Placostegus, Protis, Pseudochitinopoma, Rhodopsis, Salmacina, Spirorbinae, Spirodiscus, Tanturia, and Vitreotubus.
Euclymene gracilis Glycera unicornis Savigny in Lamarck, 1818 Glycera convoluta Keferstein, 1862 Hydroides heterocerus Grube, 1868 Hydroides norvegicus Gunnerus, 1768 Hydroides sp.
Thirty years later, Ehlers (1887) identified Spirobranchus incrassatus (Kroyer, 1863) in the Bay of Acapulco, the first record for the Mexican Pacific, but it was not until 1904 that Bush described a new species from the Mexican Pacific region: the serpulid Eupomatus humilis, a species currently valid as Hydroides humilis fide Pillai (1972).
I and Hydroides elegans: comparisons at distinct life history stages, Evol.