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Dermatobranchus dendronephthyphagus  Gosliner & Fahey, 2011

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Dermatobranchus dendronephthyphagus has recently been described, published in February 2011. It is characterized by black longitudinal lines and diffuse darker patches.
Let me quote Gosliner & Fahey (2011):
"The ground colour of the dorsum is white with a series of dark brown to black lines situated between the dorsal ridges. There are areas of denser dark pigment scattered over the surface of the notum. The oral veil has a series of large black spots that are more diffuse around the margins. There is a marginal yellow-orange band on both the notum and the oral veil. The rhinophore stalk is white with black pigment and the club is white with black pigment on the lamellae. The tips of the rhinophores are white."
There are pictures of several specimens from different locations online which look very similar, but have black spots on the foot, and some of them have an orange margin to the foot, both features were not mentioned by Gosliner & Fahey (2011).
The picture of the first specimen of Dermatobranchus dendronephthyphagus from the Philippines, (Source: California Academie of Science) shows a specimen with a solid pale blue foot. Dermatobranchus dendronephthyphagus seems to be either very variable, or a species complex.
References:
Gosliner, T. M.; Fahey, S. J. (2011). Previously undocumented diversity and abundance of cryptic species: a phylogenetic analysis of Indo-Pacific Arminidae Rafinesque, 1814 (Mollusca: Nudibranchia) with descriptions of 20 new species of Dermatobranchus.
Zoological Journal of the Linnean Society. 161: 245-356.
This publication is completely online at http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3073124/
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426 pp.
How to cite:
Köhler, E. (2020), published 2 August 2020, Dermatobranchus dendronephthyphagus  Gosliner & Fahey, 2011
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Cladobranchia/Dermatobranchus_dendronephthyphagus.htm

 
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