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Seaweeds > Division Chlorophyta
Fan green seaweeds
Avrainvillea sp.*
Family Udoteaceae
updated Jan 12

Where seen? These large paddle-shaped velvety green seaweeds are sometimes seen on some of our shores. Solitary ones might be seen sticking out of the ground here and there in coral rubble areas. Others may form clusters.

Features: The blade is flat and not ruffled. The flexible blade is made up of a tangle of tiny filaments that give it a velvety texture. The paddle-shaped blade is held up on a stiff stalk that may be buried in sand or wedged into crevices.
The stalk can be quite long with only a short portion sticking out above the surface.

According to AlgaeBase there are more than 30 current Avrainvillea species.

Sometimes confused with other fan-shaped green seaweeds. Here's more on how to tell apart fan-shaped green seaweeds.

*Species are difficult to positively identify without close examination.
On this website, they are grouped by external features for convenience of display.

Avrainvillea species recorded for Singapore
Pham, M. N., H. T. W. Tan, S. Mitrovic & H. H. T. Yeo, 2011. A Checklist of the Algae of Singapore.

  Avrainvillea amadelpha
Avrainvillea erecta
(Solitary fan green seaweed)
Avrainvillea lacerata
(Clustered fan green seaweed)
Avrainvillea obscura



  • Lee Ai Chin, Iris U. Baula, Lilibeth N. Miranda and Sin Tsai Min ; editors: Sin Tsai Min and Wang Luan Keng, A photographic guide to the marine algae of Singapore, 2015. Tropical Marine Science Institute, 201 pp.
  • Pham, M. N., H. T. W. Tan, S. Mitrovic & H. H. T. Yeo, 2011. A Checklist of the Algae of Singapore, 2nd Edition. Lee Kong Chian Natural History Museum, National University of Singapore, Singapore. 99 pp. Uploaded 1 October 2011. [PDF, 1.58 MB].
  • Lim, S., P. Ng, L. Tan, & W. Y. Chin, 1994. Rhythm of the Sea: The Life and Times of Labrador Beach. Division of Biology, School of Science, Nanyang Technological University & Department of Zoology, the National University of Singapore. 160 pp.
  • Calumpong, H. P. & Menez, E. G., 1997.Field Guide to the Common Mangroves, Seagrasses and Algae of the Philippines. Bookmark, Inc., the Philippines. 197 pp.
  • Trono, Gavino. C. Jr., 1997. Field Guide and Atlas of the Seaweed Resources of the Philippines.. Bookmark, Inc., the Philippines. 306 pp.
  • Hillson, C. J. 1982. Seaweeds: A Color-Coded, Illustrated Guide to Common Marine Plants of the East Coast of the United States Keystone Books. 194pp.
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