Alcyonidium polyoum   (Hassall,  1841) (Bryozoan)
Organism information awaits expert curation
Class: Gymnolaemata

Image copyrights: Faasse, M.A. & H. De Blauwe

Size (Zooecium): Length 370-550 µ; breadth 140-320 µ.

Encrusting. Zoaria light brownish in color. Irregular hexagonal zooecia separated by distinct zooecial walls. The size of the zooecia shows great variations. Orifices placed on small, rounded raised papillae, near the distal portion on the ventral wall. 16 tentacles.

Hermaphroditic. Reproduction mar be sexual and asexual; bryozoan colonies consist of replicated series of zooids, each budded asexually from a predecessor. The founding zooid metamorphoses from the sexually produced larva.

They are subject to competition and overgrowth from sponges, algae, and tunicates.

Synonym (s)
Sarcochitum polyoum Hassal, 1841
Alcyonidium mytili Dalyell, 1848
Alcyonidium mytili Thornely, 1905
Alcyonidium polyoum Harmer, 1915
Alcyonidium mytili Robertson, 1921
Alcyonidium polyoum Silen, 1942
Alcyonidium polyoum Osburn, 1953

Common Name (s)
Economic Importance and Threats

Trophic Level:  Consumer
Prey:  Small microorganisms, including diatoms and other unicellualr algae
Predator:  Grazing organisms such as sea urchins and fish


• Tamil Nadu, Gulf of Mannar INDIA (Record: 1905)
• Bay of Bengal INDIA (Record: 1905)
• Kerala, Off Kochi INDIA (Record: 08/1965)

Literature Source(s)
  • Menon, NR and Menon, NN (2006) Taxonomy of Bryozoa from the Indian EEZ. A monograph Ocean Science and Technology Cell on Marine Benthos, Kochi and Centre for Marine Living resources and Ecology, Kochi 263 pp Available at - NIO, Goa
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -
  • Bryozoa (sea mats/moss animals) native to the Netherlands Marine and estuarine invertebrates of the Netherlands Available at -

Page last updated on:2010-09-29

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