Initiation of a species-level fossil diatom image database

启动物种级硅藻化石图像数据库

• 批准号: 19K06820
• 负责人: Jordan Richard
• 金额: $ 2.66万
• 依托单位: Yamagata University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2019
• 资助国家: 日本
• 起止时间: 2019-04-01 至 2024-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-19K06820/
• 关键词: Eocene; Proboscia; diatom; sediments; assemblages; lineage; Pseudopyxilla; fossil; Taxonomy; Morphology; Diatom; Fossil; Diatoms; Images; Database

During 2022, I focused again on the Eocene, particularly Mors (Jutland) which contains a number of dubious Rhizosolenia spp. that appear to belong to Proboscia. One of these species, R. dubia, had a seemingly complicated life cycle - published illustrations of two specimens had shown combination cells involving Pseudopyxilla dubia and an unnamed Rhizosolenia species. Our results demonstrated that the latter was a Proboscia species and despite observing hundreds of specimens, no combination cells were seen. We named this species, Proboscia pinocchioi, due to its unique long middle spinula. Some specimens were also seen with claspers and contiguous areas on the valve base - this is the oldest record of claspers found to date, and proof that some fossil Proboscia were capable of making short chains (Abe & Jordan, 2022). Unlike the ridged forms of the P. cretacea lineage, P. pinocchioi combines characters of the two subsequent lineages, the P. barboi lineage (with large polar spines) and P. alata lineage (with claspers). Other species in Mors (R. clavigera, R. fragilis, R. juetlandica, R. sp. 1, R. sp. 3) will also need transferring to Proboscia. Further research was also conducted on other Eocene sites. Notably, Proboscia spp. with serrated edges were observed in samples from the Central Arctic, California, Barbados, Israel and Oamaru. While another Proboscia sp. in the Central Arctic formed mats. There were also clear differences between the Middle Eocene assemblages of the northern and southern hemispheres, a trend which was also apparent in Early Oligocene assemblages.

在2022年，我再次专注于始新世，尤其是莫尔（Jutland），其中包含许多可疑的根瘤菌属。这似乎属于长鼻。这些物种之一，杜比亚（R. dubia）的生命周期似乎是复杂的 - 两个标本的插图显示了涉及假pypopyxilla dubia和一个未命名的根瘤菌种类的组合细胞。我们的结果表明，后者是长鼻物种，尽管观察到数百个标本，但仍未看到组合细胞。由于其独特的长中间旋律，我们将此物种命名为Postoscia pinocchioi。还可以看到一些标本在阀座基地上的扣子和连续区域 - 这是迄今为止发现的最古老的扣子记录，并证明了某些化石长鼻有能力制作短链（Abe＆Jordan，2022年）。与葡萄氏假单胞菌谱系的脊形形式不同，P. p. pinocchioi结合了两个随后的谱系的特征，即Barboi P. barboi谱系（带有大极刺）和Alata P. alata谱系（带有吊纸）。 MORS中的其他物种（R. Clavigera，R。Fragilis，R。Juetlandica，R。Sp。1，R。Sp。3）也将需要转移到长鼻。还在其他始新世地点进行了进一步的研究。值得注意的是，长鼻属。在北极中部，加利福尼亚州，巴巴多斯，以色列和奥马鲁的样品中观察到锯齿状边缘。而另一个长鼻。在中央北极形成的垫子中。北半球和南半球的中部始新世集合之间也存在明显的差异，这一趋势在早期渐新世集合中也很明显。

项目成果

北太平洋における珪藻Proboscia 属の観察

北太平洋长鼻属硅藻的观察

• 发表时间: 2020
• 作者: Sato;M.;Nakae;M.;Sasaki;K.;上里有紀・保科一輝・Jordan R.W.;寺田竜太・阿部拓三・神谷充伸・川井浩史・倉島彰・本村泰三・坂西芳彦・島袋寛盛・田中次郎・青木美鈴;上里有紀・保科一輝・Jordan R.W.
• 通讯作者: 上里有紀・保科一輝・Jordan R.W.

Observations on the type samples of fossil Proboscia species

长鼻类化石模式样本的观察

• 发表时间: 2019
• 作者: Y. Uezato & R.W. Jordan

Rhizosolenia dubia - a 100-year-old mystery partially solved

疑似根管藻——100年前的谜团已部分解开

• 发表时间: 2022
• 作者: Jordan;R.W. & Abe;K.
• 通讯作者: K.

On the enigmatic diatom Rhizosolenia dubia, its relationship to Pseudopyxilla and Proboscia, and description of a new species, Proboscia pinocchioi sp. nov.

关于神秘的硅藻Rhizosolenia dubia，它与Pseudopyxilla和Proboscia的关系，以及新物种Proboscia pinocchioi sp的描述。

• DOI: 10.1080/0269249x.2022.2154280
• 发表时间: 2022
• 期刊: Diatom Research
• 影响因子: 1.8
• 作者: Abe;K. & Jordan;R.W.
• 通讯作者: R.W.

北太平洋及びベーリング海Probosciaのseasonal formsの観察と新種の報告

北太平洋和白令海长鼻季节形态的观测及新种报告

• 发表时间: 2020
• 作者: Sato;M.;Nakae;M.;Sasaki;K.;上里有紀・保科一輝・Jordan R.W.
• 通讯作者: 上里有紀・保科一輝・Jordan R.W.