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Placida barackobamai  McCarthy, Krug & Valdés, 2017

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Placida barackobamai is a distinctive species with a pale orange body and lower half of the cerata. The body has only a few small cream flecks. The distal half of the cerata, the dorsal surfaces of the rhinophores are velvet-black with a white line, and the sides of the head are also velvet-black.
This species was thought to have a very strange distribution. It was described by Trinchese (1893) as Hermaea cremoniana from Naples in the Mediterranean Sea and then reported by Baba (1959) from Japan.
Since then it has been found at various other places in the Pacific Ocean as far south as Sydney in eastern Australia, in Hawaii, and in Mexico and in the Indian Ocean at eastern Africa, Kenya, and the Sultanate of Oman.
McCarthy et al. (2017) recovered by molecular species delimitation P. cremoniana as a complex of four genetically divergent species, the Mediterranean species retains the name P. cremoniana, three new species were described:
from Hawaii Placida barackobamai  McCarthy, Krug & Valdés, 2017,
from California Placida brookae  McCarthy, Krug & Valdés, 2017, and
from Japan to Kenya Placida kevinleei  McCarthy, Krug & Valdés, 2017.
I changed Placida cremoniana (Trinchese, 1892) on 13 November 2017 into Placida kevinleei  McCarthy, Krug & Valdés, 2017.
Placida barackobamai, has now been observed at the Philippines, that is, it is not endemic to Hawaii,
it differs from Placida kevinleei by the white line on the upper side of the rhinophores, in Placida kevinleei there is basally a diffuse whitish patch in some specimens, no line.
References:
Trinchese, S. (1893) Nuovi Ascoglossi del golfo di Napoli.
Rendiconti dell'Accademia delle Scienze Fisiche e Matematiche della Societa di Napoli, 2(7): 154.
Baba, K. (1959) The family Stiligeridae from Japan (Opisthobranchia- Sacoglossa).
Publications of the Seto Marine Biological Laboratory, 7: 327-334.
McCarthy, J.B., Krug, P.K., & Valdés, A. 2017. Integrative systematics of Placida cremoniana (Trinchese, 1892) (Gastropoda, Heterobrachia, Sacoglossa) reveals multiple pseudocryptic species.
Marine Biodiversity doi:10.1007/s12526-017-0812-2
More information on Placida barackobamai as Placida cremoniana are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2020), published 7 October 2020, Placida barackobamai  McCarthy, Krug & Valdés, 2017
available from https://www.Philippine-Sea-Slugs.com/Sacoglossa/Placida_barackobamai.htm

 
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