Amathia convoluta   (Lamarck,  1816) (Bryozoan)
Organism information awaits expert curation
Class: Gymnolaemata

Size (Zooecium): Length 420-600 µ; breadth 125-140 µ.

Large zoarium erect, branched profusely, length of the zoarium nearly 100 mm. Place of anchorage of the colony to the substratum very thick owing to the presence of numerous rootlets from various points. Usually more rootlets emerge from the stem just above the place of attachment to the substratum. Zooecia arranged biserially, in a spiral around the internode. The connate zooecia exposed to its greater length, the width of the zooecia more or less the same, throughout their length. A distinct ridge developed at the distal end in between the paired zooecia of the spiral because of their connate arrangement. Usually the spiral takes 2 to 2 ½ turns of the internode. A distinct diaphragm separates the preceding set of zooecia from the succeeding one. Branches, which alternate, originate from the stem, immediately after the points where the diaphragm is placed. Basal regions of the zooecia (proximal) slightly rounded. A gizzard present.

Synonym (s)
Amathia convoluta Lamouroux, 1816
Amathia convoluta Harmer, 1915
Amathia convoluta Osburn, 1953
Amathia convoluta Menon and Nair, 1967
Amathia convoluta Menon and Nair, 1972

Common Name (s)
Economic Importance and Threats



• Maharashtra, Mumbai INDIA (Record: 1957)
• INDIA (Record: 2006)

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 -
  • Recent and fossil bryozoa Available at -

Page last updated on:2010-12-06

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