Halgerda sp. from Thailand

April 10, 2000
From: Narongpon Sittithaweepat

Dear Bill
I can't identify this nudibranch. I found it at Surin Island. I found to depth 70-50 feet and date 14 November 1999. I think it is genus Reticulidia sp.
Thank you
Narongpon Sittithaweepat

chromodorid@thaimail.com

Sittithaweepat. N., 2000 (Apr 10) Halgerda sp. from Thailand. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/2239

Dear Narongpon,
In a photo it's a bit difficult to be sure, but I think this is a species of Halgerda with the gills retracted into the gill pocket, rather than a species of Reticulidia, which like all phyllidiids, would have no dorsal circlet of gills.

If it is a Halgerda I think it is an unnamed species. Not many species have been described with a white line along the mantle ridges.

Halgerda xishaensis Lin, 1975, is brown with white ridges and dark brown 'knobs' or tubercles at the junction of the ridges.

H. dalanghita has a pale whitish line edged in brownish spots, and H. albocristata has secondary white lines radiating out from the tubercles. It also has a white border with black lines at right angles to the mantle edge.

None of these species have large black or dark spots in the 'valleys' as in this animal from Surin Island. It is an interesting find Narongpon. It looks quite similar to Halgerda sp. 4. from Kerama Island, but that animal was probably a juvenile, so it hard to compare them.

Best wishes,
Bill Rudman.

Rudman, W.B., 2000 (Apr 10). Comment on Halgerda sp. from Thailand by Narongpon Sittithaweepat. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/2239

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