Chromodoris willani - feeding (1)

April 8, 2006
From: Guido & Philippe Poppe

Dear Bill

Here are some photos of   Chromodoris willani you may find interesting from our website on Philippines marine life at
http://www.poppe-images.com/.

Upper photo: Cordova Point, Mactan, Philippines. 25 m. 2005.  Lower photo: San Miguel, Ticao Island,  Philippines. 35 m. 2006. Photos: Copyright Guido & Philippe Poppe.

Best wishes,
Guido & Philippe Poppe

philippe@conchology.be

Poppe, G. & Poppe, P., 2006 (Apr 8) Chromodoris willani - feeding (1). [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/16257

Dear Guido & Philippe,
Thanks for these photos. When I found your wonderful website I found these interesting feeding photos of chromodorids which I am so glad you have allowed me to share with visitors to the Forum. There are two more messages with further photos of C. willani feeding as they help to illustrate the difficulties in building up information on feeding in these animals. [see also message #16270, #16271.

One of the biggest problems when finding a nudibranch on a potential food item is judging whether it is just crawling over the item or is in fact feeding, about to feed, or just finished feeding. If you just have photos, a closer look is not possible, but if you are taking the photos then it always pays to gently 'nudge' the animal and see if it has its feeding apparatus extended, or if its head is near, or in, a suspicious hole in the food item. Another good sign is if you find a cluster of animals all on one object. In the upper photo we can see a cluster of C. willani all on some algal or bryozoan-encrusted object. Whenever you see an aggregation like this it is worth having a closer look. As I will show you in the other messages this is in fact a large colony of the sponge Semitaspongia. The lower photo is a close-up from another locality of an animal on a sponge which shows clear signs of being eaten - see the rough patches in front of the slug. I am pretty sure it is a related sponge, Petrosaspongia.

Best wishes,
Bill Rudman

Rudman, W.B., 2006 (Apr 8). Comment on Chromodoris willani - feeding (1) by Guido & Philippe Poppe. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/16257

Factsheet

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