Actinocyclus nipponicus sp. nov. and A. bradburyii sp. nov. (Bacillariophyta) from Miocene lacustrine sediments of the proto-Japan Sea

Tatsuya Hayashi, Megumi Saito-Kato, Yoshihiro Tanimura

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Fossil nonmarine Actinocyclus species, A. nipponicus sp. nov. and A. bradburyii sp. nov., are described from Miocene lake sediments in the Yamato Bank, the central part of the Japan Sea. Actinocyclus nipponicus is characterized by an inflated valve composed of a nearly flat valve face and an inclined mantle, a bullulate valve wall, fascicles sectioned by combinations of independent areola rows and hyaline stripes, loculate areolae with external cribra, rimoportulae at ends of hyaline stripes in the mantle, a single pseudonodulus at the valve face/mantle junction and well-developed spines. On the other hand, A. bradburyii is characterized by a noninflated valve composed of a nearly flat valve face and a very gently inclined mantle, a bullulate valve wall, loculate areolae with external cribra, fascicles sectioned by combinations of independent areola rows and hyaline stripes, rimoportulae at ends of hyaline stripes in the mantle, a single pseudonodulus within the valve face and misshapen cribra behind the pseudonodulus. In A. nipponicus, fascicles are composed of parallel areola rows in large valves, but are composed of radial areola rows in small valves. Additionally, in both A. nipponicus and A. bradburyii, changes in the number of rimoportulae (fascicles) occur as a function of valve size. Actinocyclus nipponicus and A. bradburyii are the most similar to A. trapeziformis and A. cupreus, respectively.

Original languageEnglish
Pages (from-to)98-112
Number of pages15
JournalPhycologia
Volume51
Issue number1
DOIs
Publication statusPublished - Jan 31 2012
Externally publishedYes

Fingerprint

Actinocyclus
lacustrine sediments
lacustrine deposit
Miocene
Japan
mantle
new species
fossils
lakes
sediments
Bacillariophyta
sea
fossil

All Science Journal Classification (ASJC) codes

  • Aquatic Science
  • Plant Science

Cite this

Actinocyclus nipponicus sp. nov. and A. bradburyii sp. nov. (Bacillariophyta) from Miocene lacustrine sediments of the proto-Japan Sea. / Hayashi, Tatsuya; Saito-Kato, Megumi; Tanimura, Yoshihiro.

In: Phycologia, Vol. 51, No. 1, 31.01.2012, p. 98-112.

Research output: Contribution to journalArticle

@article{cbbddd2330b84e3cb33c5326c8211edb,
title = "Actinocyclus nipponicus sp. nov. and A. bradburyii sp. nov. (Bacillariophyta) from Miocene lacustrine sediments of the proto-Japan Sea",
abstract = "Fossil nonmarine Actinocyclus species, A. nipponicus sp. nov. and A. bradburyii sp. nov., are described from Miocene lake sediments in the Yamato Bank, the central part of the Japan Sea. Actinocyclus nipponicus is characterized by an inflated valve composed of a nearly flat valve face and an inclined mantle, a bullulate valve wall, fascicles sectioned by combinations of independent areola rows and hyaline stripes, loculate areolae with external cribra, rimoportulae at ends of hyaline stripes in the mantle, a single pseudonodulus at the valve face/mantle junction and well-developed spines. On the other hand, A. bradburyii is characterized by a noninflated valve composed of a nearly flat valve face and a very gently inclined mantle, a bullulate valve wall, loculate areolae with external cribra, fascicles sectioned by combinations of independent areola rows and hyaline stripes, rimoportulae at ends of hyaline stripes in the mantle, a single pseudonodulus within the valve face and misshapen cribra behind the pseudonodulus. In A. nipponicus, fascicles are composed of parallel areola rows in large valves, but are composed of radial areola rows in small valves. Additionally, in both A. nipponicus and A. bradburyii, changes in the number of rimoportulae (fascicles) occur as a function of valve size. Actinocyclus nipponicus and A. bradburyii are the most similar to A. trapeziformis and A. cupreus, respectively.",
author = "Tatsuya Hayashi and Megumi Saito-Kato and Yoshihiro Tanimura",
year = "2012",
month = "1",
day = "31",
doi = "10.2216/11-17.1",
language = "English",
volume = "51",
pages = "98--112",
journal = "Phycologia",
issn = "0031-8884",
publisher = "International Phycological Society",
number = "1",

}

TY - JOUR

T1 - Actinocyclus nipponicus sp. nov. and A. bradburyii sp. nov. (Bacillariophyta) from Miocene lacustrine sediments of the proto-Japan Sea

AU - Hayashi, Tatsuya

AU - Saito-Kato, Megumi

AU - Tanimura, Yoshihiro

PY - 2012/1/31

Y1 - 2012/1/31

N2 - Fossil nonmarine Actinocyclus species, A. nipponicus sp. nov. and A. bradburyii sp. nov., are described from Miocene lake sediments in the Yamato Bank, the central part of the Japan Sea. Actinocyclus nipponicus is characterized by an inflated valve composed of a nearly flat valve face and an inclined mantle, a bullulate valve wall, fascicles sectioned by combinations of independent areola rows and hyaline stripes, loculate areolae with external cribra, rimoportulae at ends of hyaline stripes in the mantle, a single pseudonodulus at the valve face/mantle junction and well-developed spines. On the other hand, A. bradburyii is characterized by a noninflated valve composed of a nearly flat valve face and a very gently inclined mantle, a bullulate valve wall, loculate areolae with external cribra, fascicles sectioned by combinations of independent areola rows and hyaline stripes, rimoportulae at ends of hyaline stripes in the mantle, a single pseudonodulus within the valve face and misshapen cribra behind the pseudonodulus. In A. nipponicus, fascicles are composed of parallel areola rows in large valves, but are composed of radial areola rows in small valves. Additionally, in both A. nipponicus and A. bradburyii, changes in the number of rimoportulae (fascicles) occur as a function of valve size. Actinocyclus nipponicus and A. bradburyii are the most similar to A. trapeziformis and A. cupreus, respectively.

AB - Fossil nonmarine Actinocyclus species, A. nipponicus sp. nov. and A. bradburyii sp. nov., are described from Miocene lake sediments in the Yamato Bank, the central part of the Japan Sea. Actinocyclus nipponicus is characterized by an inflated valve composed of a nearly flat valve face and an inclined mantle, a bullulate valve wall, fascicles sectioned by combinations of independent areola rows and hyaline stripes, loculate areolae with external cribra, rimoportulae at ends of hyaline stripes in the mantle, a single pseudonodulus at the valve face/mantle junction and well-developed spines. On the other hand, A. bradburyii is characterized by a noninflated valve composed of a nearly flat valve face and a very gently inclined mantle, a bullulate valve wall, loculate areolae with external cribra, fascicles sectioned by combinations of independent areola rows and hyaline stripes, rimoportulae at ends of hyaline stripes in the mantle, a single pseudonodulus within the valve face and misshapen cribra behind the pseudonodulus. In A. nipponicus, fascicles are composed of parallel areola rows in large valves, but are composed of radial areola rows in small valves. Additionally, in both A. nipponicus and A. bradburyii, changes in the number of rimoportulae (fascicles) occur as a function of valve size. Actinocyclus nipponicus and A. bradburyii are the most similar to A. trapeziformis and A. cupreus, respectively.

UR - http://www.scopus.com/inward/record.url?scp=84856498769&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84856498769&partnerID=8YFLogxK

U2 - 10.2216/11-17.1

DO - 10.2216/11-17.1

M3 - Article

AN - SCOPUS:84856498769

VL - 51

SP - 98

EP - 112

JO - Phycologia

JF - Phycologia

SN - 0031-8884

IS - 1

ER -