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Horse
mussel
Modiolus sp.
Family Mytilidae
updated
May 2020
Where
seen? This large angular brown mussel is usually only sometimes seen in small numbers in seagrass meadows. In 2019, however, they formed dense patches on large areas on Changi Beach. They were also seen in large clusters on Pulau Semakau South in 2020.
Features: 3-4cm long. The two-part
shell is shiny brown, thin, fragile and smooth. The shell is rather
triangular, the older part of the shell seems to have hairs. It lies
on the ground, sometimes partially buried, and produces byssus threads
to anchor to the ground. Usually among seagrasses.
What eats them: On Cyrene in 2020, small clusters of the mussel were seen. They were mostly dead (empty shells) and Reef murex snails appeared to be feeding on them.
Status and threats: According
to Tan Koh Siang, in the 1970s, Modiolus metcalfi used to be
common in sandy and muddy areas in the intertidal and subtidal estuarine
areas such as Lim Chu Kang. They are rarely seen nowadays. |
Pulau
Sekudu, Jul 13 |
Pulau
Sekudu, Jul 13
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Dense carpet on the shore
Changi, Feb 19 |
Horse
mussels on Singapore shores |
Links
References
- Tan Siong
Kiat and Henrietta P. M. Woo, 2010 Preliminary
Checklist of The Molluscs of Singapore (pdf), Raffles
Museum of Biodiversity Research, National University of Singapore.
- Tan, K. S.
& L. M. Chou, 2000. A
Guide to the Common Seashells of Singapore. Singapore
Science Centre. 160 pp.
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