TITLE>Nudibranch of the Week is Glossodoris symmetricus

Glossodoris symmetricus

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Picture File List
Image File Size Genus Species
symm-sma.jpg 78K Glossodoris symmetricus
symm-med.jpg 125K Glossodoris symmetricus
symm-lar.jpg 96K Glossodoris symmetricus

Glossodoris symmetricus Rudman,1990

The above three photos taken in the Marshalls show what appear to be different stages in the growth of Glossodoris symmetricus Rudman,1990. The smallest of the three, symm-sma.jpg, measured about 15mm in length and had the lightest coloration and least undulose mantle margin. Symm-med.jpg was the medium sized individual, measuring about 25mm while crawling. This one's base mantle color had a tinge of yellow and its rhinophores and gills were darker orange than its smaller conspecific. Also, the medium one's mantle margin was distinctly more undulose than that of the smaller one. The third animal, symm-lar.jpg, measured 29mm in length at rest, although it probably could have stretched out a bit more than that. Its mantle was even more yellowish than the middle one, and its gills and rhinophores were even darker orange. The large specimen's most distinctive feature, however, was its highly undulose and folded mantle margin.

These are the only three specimens I've seen here in the Marshall Islands. Two of these (the largest and smallest) were included in Rudman's original description, which also included a specimen from Papua New Guinea and another from Reunion Island in the Indian Ocean. The three from the Marshalls were all found at depths of 5 to 15 meters, on the sponge encrusted undersurfaces of dead coral rocks; the largest and smallest came from Enewetak Atoll, and the middle one was found at Kwajalein Atoll.

Photos and Text courtesy of:

Scott Johnson

Hawaiian Nudibranchs
Kwajalein, Marshall Islands
Send Scott E-Mail at johnson@kmrmail.kmr.ll.mit.edu

For those of you interested in the photographic background information of the images, the following may be of interest!

Camera System: Nikonos II with 1:2 extension tube

Strobe: Oceanpro 2003 strobe

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