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Phylum Cnidaria > Class Anthozoa > Subclass Zoantharia/Hexacorallia > Order Actiniaria
Rough anemone
Macrodactyla aspera
Family Actiniidae
updated Jul 2023

Where seen? This anemone is sometimes seen on sand and seagrasses on our Northern shores. Aspera means 'rough' in Latin.

Features: Diameter with tentacles extended 20cm or more. The oral disk 5-8cm in diameter. Tentacles not many. About 48 long tentacles (10cm) translucent, on the upper side covered in scattered small brown spots. Oral disk with thick brown splotches radiating outwards, mouth edge white. The upper body column has rows of bumps (verrucae) that are sticky - bits of sand and stuff often stuck on them.

Sometimes confused with the Glass anemone which has more transparent tentacles that lack the small brown spots and has black rings where the tentacles attach to the oral disk, the oral disk does not have dark brown blotches, and does not have many rows of sticky bumps on the body column.

Status and threats: There is inadequate information as at 2024 to make an informed assesment of its conservation status in Singapore.

Cyrene, Feb 15

Brown splotches radiating out.

Small brown spots on upper side of tentacles.

White 'lips'
Pulau Sekudu, Jun 18

Photo shared by Loh Kok Sheng on facebook.


White bumps on the upper body column.
Pulau Sekudu, Jun 18

Photo shared by Loh Kok Sheng on facebook.
 

Rough anemones on Singapore shores
On wildsingapore flickr

Other sightings on Singapore shores


Changi, May 18
Photo shared by Jianlin Liu on facebook.

Changi, Dec 17
Photo shared by Loh Kok Sheng on facebook.

Changi Carpark 7, Jun 23
Photo shared by Loh Kok Sheng on facebook.


Pulau Sekudu, Jul 16
Photo shared by Russel Low on facebook.

Pulau Sekudu, Jun 17
Photo shared by Toh Chay Hoon on facebook.


Pulau Sekudu, Jun 14


Photo shared by Loh Kok Sheng on flickr.

East Coast Park (B), Jun 21
Photo shared by Richard Kuah on facebook.


Cyrene Reef, Jun 11


Photo shared by Loh Kok Sheng on flickr.


Cyrene Reef, Aug 13


Photo shared by Loh Kok Sheng on flickr.

References

  • Checklist of Cnidaria (non-Sclerectinia) Species with their Category of Threat Status for Singapore by Yap Wei Liang Nicholas, Oh Ren Min, Iffah Iesa in G.W.H. Davidson, J.W.M. Gan, D. Huang, W.S. Hwang, S.K.Y. Lum, D.C.J. Yeo, 2024. The Singapore Red Data Book: Threatened plants and animals of Singapore. 3rd edition. National Parks Board. 258 pp.
  • Nicholas Wei Liang Yap Taxonomy and Molecular Phylogeny of the Sea Anemone Macrodactyla (Haddon, 1898) (Cnidaria, Actiniaria), with a Description of a New Species from Singapore. Zoological Studies 62:29 (2023) doi:10.6620/ZS.2023.62-29.
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