Halgerda formosa - feeding?
January 7, 2004
From: Yves Coze
Here are some more of Yves Coze's photos showing colour variation in Halgerda formosa which he and his colleagues have spotted in Reunion Island. This photo shows the red sponge it is often found on.
"They were all spotted either in "Cap La Houssaye" or "Abri Cotier" which are two diving spots separated by approx 4 km. Composition of the spot are the same, Rocky area with various sandy and coral area. Nevertheless, Halgerda were mostly spotted on bare basalt area (60%), we spotted a "group" on a red sponge (20%) , sometimes on sandy area (15%)scarcely on coral reef (5%). According to my dive buddy, they can be spotted on these red sponges at almost every dive. Maybe the Halgerda feed on these sponges ?"
As I wanted to keep the images reasonably large I have separated them into a number of separate messages [see message 1, message 2, message 3]. I have discussed the variation in a separate message.
Bill Rudman
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