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Geographic
sea hare
Syphonota geographica
Family Aplysiidae
updated
May 2020
Where
seen? This chubby delicately patterned sea hare is seasonally
common on our Northern shores, among seagrasses. Sometimes large numbers
are seen, at other times, not at all. Often found half buried in the soft sediment, but sometimes crawling in the
open, especially near sunrise or at night. It is also known as Paraplysia
geographica.
Features: 8-12cm. Body large, heavy and smooth. With two pairs of tentacles:
one pair of oral tentacles forming flap at the front of the body.
When compared with sea hares of the genus Aplysia, sea hares
of the genus Syphonota have relatively small rhinophores which
are close together and situated further back from the head almost
between the long 'wings' or parapodia. When submerged, these wings
are held high. It is said that they can swim with their parapodia. Usually
olive or yellowish greenish with tiny white spots forming patterns
with fine line horizontal lines along the body.
Sometimes confused with the Spotted sea hare which has a pattern of tiny white spots that form patches and doesn't have fine horizontal lines. |
Changi, Jun 05 |
Tiny rhinophores near one another,
held between parapodia. |
Thin internal
shell.
Changi, Jun 07 |
Baby sea hares: It lays long tangles of
pink egg strings among seaweeds and seagrasses.
What does it eat? It is believed
to feed on brown seaweeds, but in our observations, these animals
seem more abundant during blooms of the green sea
lettuce seaweed (Ulva sp.). |
Laying egg string
Changi, Jun 05
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Half buried in soft sediment.
Changi, Apr 12
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Swimming sea
hare!
Cyrene Reef, Nov 11
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Geographic
sea hares on Singapore shores |
Other sightings on Singapore shores |
East Coast Park, May 16
Photo shared by Ywee Chieh on facebook. |
Tuas, Mar 15
Photo shared by Loh Kok Sheng on his blog. |
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Cyrene Reef,
Aug 11
Photo
shared by Neo Mei Lin on her
blog. |
Cyrene, Jun 20
Photo shared by Loh Kok Sheng on facebook. |
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.
- Coleman,
Neville. 2001. 1001
Nudibranchs: Catalogue of Indo-Pacific Sea Slugs. Neville
Coleman's Underwater Geographic Pty Ltd, Australia.144pp.
- Humann, Paul
and Ned Deloach. 2010. Reef
Creature Identification: Tropical Pacific New World Publications.
497pp.
- Gosliner,
Terrence M., David W. Behrens and Gary C. Williams. 1996. Coral
Reef Animals of the Indo-Pacific: Animal life from Africa to Hawaii
exclusive of the vertebrates Sea Challengers. 314pp.
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