Umbonium - Umbonium

Japanese: ウンボニウム - うんぼにうむ
Umbonium - Umbonium

...The surface patterns of these three types of shells are dissolved with acid, leaving only the nacre, and they are sold as souvenirs in places such as Futami, Ise.
[Evolution of the oxeye reptiles]
The umbonium species evolved from Protorotella , which became extinct at the end of the Miocene, during the Miocene period of the Cenozoic era. The first to appear was Umbonium ( Suchium ) joganjiense , a member of the Protorotella species group (subgenus Suchium ).

*Some of the terminology explanations that mention "umbonium" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…これら3種の殻は酸で表面の模様を溶かして真珠層だけにして,伊勢二見などではみやげ物になっている。
[キサゴ類の進化]
 キサゴ類(ウンボニウムUmbonium)は新生代中新世の中ごろ,中新世末滅亡したProtorotellaから分化した。まずその中のダンベイキサゴ種群(Suchium亜属)のUmbonium (Suchium) joganjienseが最初に現れた。…

※「ウンボニウム」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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