Halgerda elegans Berg, 1905
This is Halgerda elegans, the animal which was used to compare morphological similarities with the new species, Halgerda albocristata Gosliner & Fahey, 1998. Halgerda elegans was first described in 1905 by Bergh, although the description was rather incomplete and it has not been reported in the literature since then. This specimen is 8 mm long, and was originally described from Indonesia. The photo you see above was taken by Dr. Terry Gosliner in Papua New Guinea. This species id found crawling in the open on reefs, rocky surfaces and also under coral rubble from 5-13 meters depth. Like Halgerda albocristata, H. elegans feeds on unidentified sponges. The coloration, reproductive and the radular morphology of Halgerda elegans differs significantly from H. albocristata. However, H. elegans also contains the flattened glandular structures in the gills.
Terrence M. Gosliner and Shireen J. Fahey. 1998.Description of A New Species of Halgerda from the Indo-Pacfic with a Redescription of Halgerda Elegans Bergh, 1905 . Proceedings of the California Academy of Sciences, 50(15): 347-359, 9 Figs.
Shireen Fahey and Terry Gosliner
Shireen is in the Marine Biology program and for her thesis, she is developing
the phylogeny and biogeography of the nudibranch genus Halgerda. She has
started with a set of morphological characters but intends to include
molecular and biochemical character sets.