742. JAPANESE MIOCENE CIRRIPED BALANUS SENDAICUS : A COMPARISON WITH TETHYAN BALANUS CONCAVUS GROUP

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  • 742. 日本の中新世蔓脚類 Balanus sendaicus Hatai, Masuda and Noda について : テーチス海の Balanus concavus 種群と比較して
  • 日本の中新世蔓脚類Balanus sendaicus Hatai,Matai,Masuda and Nodaについて--テーチス海のBalanus concavus種群と比較して〔英文〕
  • ニホン ノ チュウシンセイ ツルアシルイ Balanus sendaicus

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Abstract

Balanus sendaicus was described as a new species by Hatai, Masuda and Noda (1976) based on a single scutum from the Miocene Moniwa Formation, northern Honshu, Japan. However, the scutum deposited in the Saito Ho-on Kai Museum, Sendai, Japan (Hatai et al., 1976) could not be found. Tergum and shell wall, which with scutum comprise the skeletal elements, had not been described. According to my investigation of topotype materials and of materials illustrated by Hatai et al. (1976), the shell walls described and illustrated under the name of B. rostratus by Hatai et al. (1976) belong to B. sendaicus. B. sendaicus, including tergum undescribed by Hatai et al. (1976), is therefore defined in this paper. B. sendaicus is distinct from the already known taxa, as mentioned by Hatai et al. (1976). However, B. sendaicus is closely related to the extinct B. concavus sensu de Alessandri (1906), which flourished in the Mediterranean region (Tethys) from the Oligocene to Pleistocene. B. sendaicus belongs to the B. concavus species group represented by the nominal species based on having transverse septa in longitudinal (parietal) tubes of shell wall and the characteristic ornamentation of scutum. Disappearance of the B. concavus group from the Atlantic and the Mediterranean regions in Pleistocene is mysterious as mentioned by Pilsbry (1916), though "four" species belonging to the B. concavus group are living in the eastern Pacific (Newman, 1979). B. sendaicus is restricted to the Miocene, is the first fossil record of the B. concavus group from the east Asia, and indicates the presence of a connection between the Tethys and the east Asia.

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