Phanerophthalmus olivaceus (Ehrenberg, 1828) [Cryptophthalmus]

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Phanerophthalmus olivaceus is characterized by the cream body, densely flecked with olive green. It has a translucent shell with a greatly expanded aperture and an outer lip that projects well above the apex. The shell is external but only about 1/8 the length of the animal and almost completely covered by the parapodia. The headshield of Phanerophthalmus smaragdinus is proportionally very small, the posterior shield and enclosed mantle cavity is an equally small remnant at the posterior end of the body.
The genus Phanerophthalmus has a remarkable resemblance to members of the family Aglajidae, and until quite recently was considered to be a member of that family. It is an herbivorous opisthobranch, closely related to the genus Haminoea, with a similar radula and gizzard plates.
The photographer Klaus Stiefel writes on this 2 specimens:"Found in the shallow waters next to mangrove roots, quite abundant in San Remigio."
This species was published on 21 June 2011 on these websites as Phanerophthalmus smaragdinus (Rüppell & Leuckart, 1828) [Cryptophthalmus]. I changed the year on 8 January 2016 into 1830.
Yonow N. (2000) synonymized Phanerophthalmus smaragdinus (Rüppell & Leuckart, 1830) [Bulla] with
Phanerophthalmus olivaceus (Ehrenberg, 1828) [Cryptophthalmus]
I changed it again on 6 November 2018 and moved it from the family Smaragdinellidae  A. Adams & Reeve, 1848 into the
family Haminoeidae  Pilsbry, 1895.
Rüppell E. & Leuckart F.S. (1828-1830). Mollusca [in] Atlas zu der Reise im nördlichen Afrika von Eduard Rüppell. 1. Abth. Zoologie. 5. Neue wirbellose Thiere des Rothen Meers.
Frankfurt, H.L. Brönner pp. 1-22, pl. 1-12 [1828], pp. 23-47 [probably 1830], page(s): 26, plate XI, Figure 2a - 2d
available online at http://www.biodiversitylibrary.org/item/114235#page/349/mode/1up
Yonow N. (2000). Red Sea Opisthobranchia 4: The orders Cephalaspidea, Anaspidea, Notaspidea and Nudibranchia: Dendronotacea and Aeolidiacea.
Fauna of Arabia. 18: 87-131.
More information on Phanerophthalmus olivaceus as Phanerophthalmus smaragdinus are on Bill Rudman's Sea Slug Forum!
How to cite:
Köhler, E. (2018), published 6 November 2018, Phanerophthalmus olivaceus (Ehrenberg, 1828)
available from https://www.Philippine-Sea-Slugs.com/Cephalaspidea/Phanerophthalmus_olivaceus.htm


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