Janolus sp. 4? from Singapore.

December 15, 2008
From: Toh Chay Hoon

Concerning message #7100:

Dear Dr Bill,

This nudibranch was sighted on a sandy substrates while diving at Pulau Hantu, one of Singapore's southern islands. It looks similar to Janolus sp. 4.

It was moving pretty fast and I would say it's like how a big fat juicy caterpillar moves.

Locality: Pulau Hantu, 15 m , Singapore, South China Sea, 23 March 2008, Sandy Substrates. Length: 20 mm. Photographer: Toh Chay Hoon.

Toh Chay Hoon

sonnenflower@gmail.com

Toh C.H., 2008 (Dec 15) Janolus sp. 4? from Singapore.. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/22081

Dear Chay Hoon,
It is often difficult to determine if these aeolid-looking nudibranchs are aeolids or something else - perhaps even sacoglossans. Fortunately, as we can see in a close-up of one of your photos, this animal has the wrinkled ridge [caruncle] between the rhinophores which shows it is indeed a species of Janolus. Bernard Picton [message #21950] wondered whether there were two species in the group I am calling Janolus sp 4, so there si the possibility that there is more than one species involved.  Your animal certainly falls into the range of colour pattern I am considering to be Janolus sp 4.

Best wishes,
Bill Rudman

Rudman, W.B., 2008 (Dec 15). Comment on Janolus sp. 4? from Singapore. by Toh Chay Hoon. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/22081

Factsheet

Janolus sp. 4

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