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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.
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