Polybranchia orientalis (Kelaart, 1858) [Proctonotus]

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Polybranchia orientalis has large flattened leaf-like 'cerata' which are easily cast-off if the animal is disturbed. It is a relatively common member of the Hermaeidae in the Philippines, but because of its camouflage seldom seen. The same specimen on my hand and in situ.
Medrano et al. (2018) list 3 species of Polybranchia  Pease, 1860 which occur at the Philippines:
- Polybranchia orientalis (Kelaart, 1858) [Proctonotus],
- Polybranchia jannae  Medrano, Krug, Gosliner, Biju Kumar & Valdés, 2018, and
- Polybranchia jensenae  Medrano, Krug, Gosliner, Biju Kumar & Valdés, 2018
there are some differences in the morphology, which are hard to see on most pictures, there is a DNA analysis needed for exact identification.
That is, the above specimens might be as well another species, but I keep them as Polybranchia orientalis (Kelaart, 1858) [Proctonotus].
Medrano S., Krug P.J., Gosliner T.M., Biju Kumar A. & Valdés Á. (2018). Systematics of Polybranchia  Pease, 1860 (Mollusca: Gastropoda: Sacoglossa) based on molecular and morphological data.
Zoological Journal of the Linnean Society. , available online at http://10.1093/zoolinnean/zly050/5077298
More information on Polybranchia orientalis are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2021), published 19 June 2021, Polybranchia orientalis (Kelaart, 1858)
available from https://www.Philippine-Sea-Slugs.com/Sacoglossa/Polybranchia_orientalis.htm


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