Cirripedes from the Miocene Mizunami Group, central Japan, with the description of a new species of Amphibalanus Pitombo from the Iwamura Group, central Japan

抄録

Miocene barnacles (Cirripedia, Thoracica) from the Mizunami Group are clarified, based upon examinations of the paleontological collection in the Mizunami Fossil Museum and newly obtained materials. The present taxonomic study reports 31 species in 23 genera, divided between eight families. Of these, nine genera and 21 species are recorded for the first time from the Miocene of Japan. Five new species are included: Lepas tanakai (Lepadidae), Tetraclitella mizunamiensis (Tetraclitidae), Tetraclitella tokiensis (Tetraclitidae), Megabalanus yamaguchii (Balanidae), and Solidobalanus hataii (Balanidae). Additionally, Amphibalanus itoigawai, a new species of Balanidae, is described, based upon examination of the Iwamura and Mizunami groups. The cirripede fauna of the Mizunami Group is the most diverse in the Miocene of Japan. The fauna consists of all extant genera and largely represents benthic taxa which lived in the intertidal–upper sublittoral zone at the present Japan and adjacent seas.