Dendrodoris denisoni

Photo courtesy of Carole Harris
Photo taken at Dubai, UAE

Dendrodoris denisoni (Angas, 1874)

Almost as pretty as a chromodorid, this species lacks a radula and is therefore a porostome. Dendrodoris denisoni differs from most dendrodorids (except D. tuberulosa in have a highly tuberculate dorsum. Its identification cannot be mistaken due to the presence of deep blue spots in the notal pits between the compound tubercles. Its wide variation in color can be seen on The Sea Slug Forum.

This species is known from throughout the tropical and warm temperate Indo-West Pacific. Specimens may reach 80-90 mm in length.

Like all porostomes, D. denisoni is a sponge eater. Because it has no radula or jaws to bite and chew the sponge tissue, these critters spit a pool of digestive enzymes onto the surface of the sponge, and then slurp up the resultant soup of the softened sponge tissue.

If you are looking for a fantastic Holiday gift for all your friends, relatives, fellow slug afficonatos and dive buddies – Note that Carole’s photo above is the cover shot from the just released - 2007 Nudibranch Calendar , produced by John Moore and Sea Challengers. This photo will give you a taste of what is to come inside. Over 50 photos, out of over 1100 , contributed by 119 photographers from around the world decorate the pages of this unique calendar.

Dave Behrens
Gig Harbor, Washington
Oct., 2006

Carole Harris

Nudibranch Calendar 2007

Nudibranch Calendar
"Pre-Order NOW for October Delivery"
2007. Dave Behrens, Sea Challengers & John H. Moore, Divebums

2007 Nudibranch Calendar

Sea Challengers is producing our first "Spectacular" marine life calendar. The topic will be "Nudibranchs." We anticipate using approximately 50 photographs of nudibranchs from around the world.

Dimensions: 8.5 x 11
Photos: Approx. 50 color photographs
Softcover Item #CAL07 $19.95
Contact Dave at

Puerto Vallarta, Mexico
March 2005

Ali Hermosillo and Dave Behrens

Author: Pacific Coast Nudibranchs and Nudibranch Behavior
Co-Author Coral Reef Animals of the Indo Pacific
Proprietor of Sea Challengers Natural History Books

Send Dave mail at

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