There are 13 species of coral-inhabiting megatrematine barnacles of which five or possibly six are
extinct. Despite a meager geological record dating from the early Pliocene, it appears, based on their distribution megatrematines are far older than indicated by their fossil record, likely originating early in the Miocene ifnot the Oligocene. Nonetheless, in apparently maintaining a conservative morphology, especially in their opercular plates, they never attained the diversity of forms such as found in the coral-inhabiting pyrgomatines. However, we propose new taxa herein including Memagreta n. gen. for M. pandorae n. sp., Megatrema youngi n. sp. and Pyrgomina djanae n. sp. The extinct species Pyrgoma elargatum Seguenza and P sulcatum Philippi are considered valid species and herein assigned to Pyrgomina. Adna Sowerby is reinstituted as a valid genus. The tribe Pyrgominini is proposed for Pyrgomina and Adna and the tribe Megatrematini for Megatrema and Memagreta.
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[Show abstract][Hide abstract] ABSTRACT: The present study recorded the biodiversity of cirripedes collected in the Philippine Panglao 2005 Expedition, which yielded 20 species in 4 families of stalked barnacles and 3 families in sessile barnacles. All species were described using light microscopy and selected species which received lesser descriptions were studied using scanning electron microscope to illustrate the fi ne details including the setations of the mouth parts and cirri. The present study identifi ed new Arcoscalpellum and Paralepas species and with new records in the Philippine waters including Teloscalpellum ecaudatum, Trianguloscalpellum diota, Paralepas minuta and Adna anglica.