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Seaweeds > Division Chlorophyta > Family Caulerpaceae > genus Caulerpa
Mexican green seaweed
Caulerpa mexicana*
Family Caulerpaceae
updated Oct 2019

Where seen? This feathery green seaweed is sometimes seen in small patches on our Southern shores. It was also called Caulerpa crassifolia.

Features: A feather-like structure about 2cm long. The mid-rib or central 'stem' of the feathery structure is flat and usually with a width wider or the same as the length of the side 'branches'. The side 'branches' are short, flat and have rounded to bluntly pointed tips. These little feathery structures emerge along the length of a 'stem' that creeps over hard surfaces or just under the sand.
Colours generally bright green.

Its scientific name is mexicana because the seaweed was originally described from specimens from Mexico.

Sometimes confused with other feathery green seaweeds or with seagrasses. Here's more on how to tell apart different feathery green seaweeds and how to tell apart feathery green seaweeds and seagrasses.

In small clumps on rocky areas.
St John's Island, Sep 04

Mid-rib width wider or the same
as the length of side 'branches'.
Chek Jawa, Aug 07

Terumbu Berkas, Jan 10

Side branches with rounded or
bluntly pointed tips.

Terumbu Pempang Laut, Aug 10

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

Mexican green seaweeds on Singapore shores
On wildsingapore flickr

Other sightings on Singapore shores

Pulau Senang, Aug 10

Links References
  • 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, 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].
  • Eric Coppejans and Tom Beeckman. 1990. Caulerpa (Chlorophyta, Caulerpales) from the Kenyan coast (pdf). Laboratorium voor Morfologie, Systematiek en Ecologie van de Planten R.U.G. Ledeganckstraat 35, 9000 Gent, Belgium on the Phycology Research website: identification key and useful diagrams on how to tell apart similar Caulerpa species.
  • Huisman, John M. 2000. Marine Plants of Australia University of Western Australia Press. 300pp.
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