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Seaweeds > Division Chlorophyta > Avrainvillea species
Solitary fan green seaweed
Avrainvillea erecta*
Family Udoteaceae
updated Oct 2019

Where seen? These solitary stalked green fans are sometimes seen on some of our shores, sticking out of the ground here and there. Usually in coral rubble areas.

Features: A paddle-shaped blade (4-5cm wide), usually growing alone, sometime a few near one another. The blade is flat and not ruffled, and may be divided into four or more 'wings'. The flexible blade is made up of a tangle of tiny filaments that give it a velvety texture. The blade is held up on a stiff stalk that may be buried in sand or wedged into crevices.
The stalk can be quite long (up to 10cm long), with only a short portion sticking out above the surface. Sometimes, the single blade is divided into three or four 'wings'. Usually dark green sometimes with pale or yellowish edges.

Sometimes, tiny Strawberry slugs (Costasiella sp.) are found on this seaweed.

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

Tuas, Jun 05

Kusu Island, Jun 05

Chek Jawa, May 05

Sometimes divided into four or more 'wings'.
Pulau Sekudu, Jan 06
Strawberry slug found on the seaweed.
Tanah Merah, Dec 09

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

Solitary fan green seaweeds on Singapore shores
On wildsingapore flickr

Other sightings on Singapore shores

Beting Bemban Besar, Aug 18
Photo shared by Liz Lim on facebook.

Terumbu Pempang Tengah, Jun 20
Photo shared by Vincent Choo on facebook.

Pulau Pawai, Dec 09

Pulau Sudong, Dec 09

Pulau Berkas, May 10



  • 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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