Mode of occurrence and taphonomy of the heteromorph ammonite Pravitoceras sigmoidale Yabe from the Upper Cretaceous Izumi Group, Japan

Yoshino, Kohei; Matsuoka, Atsushi

doi:10.1016/j.cretres.2016.02.003

Cretaceous Research

2016

DOI: 10.1016/j.cretres.2016.02.003

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Mode of occurrence and taphonomy of the heteromorph ammonite Pravitoceras sigmoidale Yabe from the Upper Cretaceous Izumi Group, Japan

Kohei Yoshino

Atsushi Matsuoka

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Cited by 5 publications

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“…Various nostoceratid heteromorph ammonites occur in the Upper Cretaceous Izumi Group and the Toyajo Formation (Sotoizumi Group) in southwest Japan (Yabe 1901, 1902, 1915; Matsumoto et al . 1981; Bando & Hashimoto 1984; Morozumi 1985, 2007; Misaki & Maeda 2009, 2010; Yoshino & Matsuoka 2016; Misaki & Tsujino 2021). Among them, Pravitoceras sigmoidale Yabe, 1902 has a peculiar shell shape with a near‐planispiral phragmocone and a c .…”

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Evolutionary process of extremely twisted heteromorph ammonites from the Upper Cretaceous of Japan

Misaki,

Okamoto,

Maeda

2023

Papers in Palaeontology

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The heteromorph ammonite Pravitoceras sigmoidale with extremely twisted retroversal hook and its probable ancestors, Didymoceras awajiense and D. morozumii, occur mainly in the Upper Cretaceous Izumi and Sotoizumi groups in southwest Japan. Their morphological characteristics were investigated in this study. Morphotypes I–II were recognized in D. morozumii. Morphotypes III–V were recognized in D. awajiense. Morphotypes VI–VIII were recognized in P. sigmoidale. Moreover, all morphotypes were recognized in both the dextral and sinistral forms of these three species. Based on the morphological and stratigraphic relationships, it is considered that the evolutionary process of these species is divided into three steps: (1) shift from morphotypes I–II to III; (2) increase in variation from morphotypes III to III–V; and (3) shift from morphotypes III–V to VI–VIII. By comparing these morphotypes based on the ‘growing tube model’ belonging to the moving frame analysis, it is seen that there are no significant gaps of coiling patterns in the evolutionary processes of this lineage. Meanwhile, morphotypes III–V of D. awajiense have a larger morphological variation than morphotypes I–II of D. morozumii and morphotypes VI–VIII of P. sigmoidale. These results, and the radiometric ages from previous studies, suggest that D. awajiense, with considerable variation between ancestor and descendant species, existed in a short interval. It seems that P. sigmoidale occurred after the continuous but rapid and drastic morphological evolution from D. morozumii via D. awajiense.

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mentioning

confidence: 99%

Evolutionary process of extremely twisted heteromorph ammonites from the Upper Cretaceous of Japan

Misaki,

Okamoto,

Maeda

2023

Papers in Palaeontology

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Late Campanian–early Maastrichtian heteromorph-dominated ammonoid assemblages of the Nakaminato Group, central Honshu, Japan: biostratigraphic and paleontological implications

Masukawa

Ando

2018

Cretaceous Research

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Plant productivity parameters in rice varieties with different type of panicles and their variability

2021

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To increase rice yield, scientists are considering the possibility of changing the morphological parameters of plants. At the same time, there are not enough attempts in Russia to analyze the yield potential of varieties with different panicle architectonics. The purpose of our research was a comparative analysis of rice varieties differing in panicle morphotype, by the formation of productivity elements. In the ecological conditions of the south of Russia, in 2019-2020, a series of field experiments were carried out with 24 Oryza sativa L. varieties under conditions of artificial irrigation. The results of assessing the elements of plant productivity and biological productivity of varieties differentiated into 6 groups according to the panicle type and grown on plots 1x12 m are presented. The present study showed that in the rice-growing zone of Krasnodar region, varieties with a compact inclined and slightly spreading panicle had an advantage in achieving high productivity. However, the stability of quantitative traits was exhibited by varieties with spreading panicles of the drooping type. Correlation analysis confirmed: the longer the panicle, the more spreading it is and the less sterile spikelets are formed on it. Along with other researchers, we revealed significant differences in yield between japonica and Indica varieties. Due to the cultivation of varieties under equal conditions, the variation in biological yield from 778 to 1203 g / m2 can be explained by their genotypic characteristics. For the sustainable development of rice growing in the region, our studies emphasize the importance of the diversity of varieties of various morphotypes with high potential and stability of productivity elements and provide useful information for breeding.

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Mode of occurrence and taphonomy of the heteromorph ammonite Pravitoceras sigmoidale Yabe from the Upper Cretaceous Izumi Group, Japan

Cited by 5 publications

References 10 publications

Evolutionary process of extremely twisted heteromorph ammonites from the Upper Cretaceous of Japan

Evolutionary process of extremely twisted heteromorph ammonites from the Upper Cretaceous of Japan

Late Campanian–early Maastrichtian heteromorph-dominated ammonoid assemblages of the Nakaminato Group, central Honshu, Japan: biostratigraphic and paleontological implications

Plant productivity parameters in rice varieties with different type of panicles and their variability

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