Nudibranch:- Dendronotus lacteus
Taken off the Isle of Man.
Photo copyright Tim Nicholson.

Until 1998 this animal was thought to be the same species as Dendronotus frondosus. However, genetic analysis by M. Tholleson suggested that the two colour forms were distinct species and so he resurrected the name Dendronotus lacteus because it matched his animals in external shape and colour.

Further Reading
Great British Marine Animals, by Paul Naylor, Deltor (2011)
The Underwater Photographer: Digital and Traditional Techniques, by by Martin Edge, Paperback, 536 pages (2009)
Discrimination of two Dendronotus species by allozyme electrophoresis and the reinstatement of Dendronotus lacteus (Thompson, 1840) (Nudibranchia, Dendronotoidea) - THOLLESSON - 1998 - Zoologica Scripta

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