882. DENTICULOPSIS PRAEHYALINA, SP. NOV. : AN EARLY MIDDLE MIOCENE PENNATE DIATOM FROM DOGO, OKI ISLANDS, SOUTHWEST JAPAN

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  • 882. Denticulopsis praehyalina, 隠岐島後産中期中新世初期羽状目珪藻の一新種
  • Denticulopsis praehyalina,隠岐島後産中期中新世初期羽状目珪藻の1新種〔英文〕
  • Denticulopsis praehyalina オキドウゴサン チュ

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Abstract

A new pennate diatom, Denticulopsis praehyalina, from the early Middle Miocene diatomite of the Oki Islands is described. This species has many affinities to Denticulopsis hyalina but differs from it by having areolation on valve face. The new species combines morphological features of two Denticulopsis species, D. hyalina and D. lauta. A predominance or acme of D. praehyalina is restricted to the uppermost part of Middle Miocene D. hyalina Zone in the Northwest Pacific, and it is a good maker for the horizon.

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