Erugomicula, a new genus of Arcellinida (testate lobose amoebae)

IF 2 4区地球科学 Q1 Earth and Planetary Sciences

Palaeontologia Electronica Pub Date : 2021-01-01 DOI:10.26879/807

N. Nasser, B. Gregory, D. Singer, R. Patterson, H. Roe

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引用次数: 2

Abstract

Testate lobose amoebae of the order Arcellinida are a diverse, cosmopolitan group of shelled protists found in many environments, including freshwater habitats, peatlands, and soils. Their decay-resistant tests make them an important fossil group for reconstructing Quaternary environments. Within the family Difflugidae Stein, 1859 more than 300 species and 200 sub-species have been attributed to the genus Difflugia Leclerc, 1815. Although carried out on only a few taxa, molecular evidence has demonstrated that test morphology is more important than test composition in categorizing distinct taxa within the Arcellinida. The type species of Difflugia, D. proteiformis Lamarck, 1816, is characterized by a terminal aperture and an elongate acuminate test. The morphology of D. proteiformis is vastly different from most species assigned to Difflugia, explaining its polyphyletic status. We reclassify Difflugia bidens Penard, 1902 as type species of Erugomicula, a new genus within the Difflugidae, which is distinguished from other taxa within Difflugia by its broad, ovoid test, and distinct compression. Based on the compressed morphology of the test, which is not a characteristic of the Difflugiidae, we tentatively assign Erugomicula to the family Hyalospheniidae. Nawaf A. Nasser. Ottawa-Carleton Geoscience Centre and Department of Earth Sciences, Carleton University, Ottawa K1S 5B6, Canada. nawaf.nasser@carleton.ca Braden R.B. Gregory. Ottawa-Carleton Geoscience Centre and Department of Earth Sciences, Carleton University, Ottawa K1S 5B6, Canada. GregorBRB@gmail.com David Singer. Department of Zoology, Institute of Biosciences, University of São Paulo, São Paulo, Brazil and Ottawa-Carleton Geoscience Centre and Department of Earth Sciences, Carleton University, Ottawa K1S 5B6, Canada. david.singer.bio@outlook.com R. Timothy Patterson. Ottawa-Carleton Geoscience Centre and Department of Earth Sciences, Carleton University, Ottawa K1S 5B6, Canada. tim.patterson@carleton.ca Helen M. Roe. School of Natural and Built Environments, Queen’s University Belfast, Belfast, United Kingdom, BT7 1NN. h.roe@qub.ac.uk NASSER ET AL.: Erugomicula, A NEW GENUS OF ARCELLINIDA 2

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阿米巴虫属一新属(无睾丸叶状阿米巴)

无足叶变形虫是一种多样化的、世界性的有壳原生生物，存在于许多环境中，包括淡水栖息地、泥炭地和土壤。它们的耐腐测试使它们成为重建第四纪环境的重要化石群。在Difflugia Stein(1859)科中，超过300种和200亚种被归为Difflugia Leclerc属，1815。虽然只在少数分类群上进行，但分子证据表明，在划分Arcellinida内不同分类群时，测试形态比测试组成更重要。dilugia的模式种D. proteiformis Lamarck, 1816，其特征是末端有一个孔和一个细长的渐尖试验。D. proteformis的形态与大多数被分配到Difflugia的物种有很大的不同，解释了它的多系地位。本文将dilugia bidens Penard, 1902重新分类为Erugomicula的模式种，Erugomicula是dilugidae中的一个新属，它以其广泛的卵形试验和明显的压缩而区别于dilulugia中的其他分类群。基于压缩形态的测试，这不是一个特征的Difflugiidae，我们暂时将Erugomicula归于家庭Hyalospheniidae。Nawaf A. Nasser。渥太华-卡尔顿地球科学中心和卡尔顿大学地球科学系，加拿大渥太华K1S 5B6。nawaf.nasser@carleton.ca布雷登R.B.格雷戈里。渥太华-卡尔顿地球科学中心和卡尔顿大学地球科学系，加拿大渥太华K1S 5B6。GregorBRB@gmail.com大卫·辛格。巴西圣保罗大学生物科学研究所动物学系，渥太华-卡尔顿地球科学中心和卡尔顿大学地球科学系，渥太华K1S 5B6，加拿大。david.singer.bio@outlook.com蒂莫西·帕特森。渥太华-卡尔顿地球科学中心和卡尔顿大学地球科学系，加拿大渥太华K1S 5B6。tim.patterson@carleton.ca海伦·m·罗。贝尔法斯特女王大学自然与建筑环境学院，英国贝尔法斯特，bt71nn。h.roe@qub.ac.uk NASSER ET AL.: Erugomicula, ARCELLINIDA的一个新属

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来源期刊

Palaeontologia Electronica 地学-古生物学

CiteScore

3.60

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Founded in 1997, Palaeontologia Electronica (PE) is the longest running open-access, peer-reviewed electronic journal and covers all aspects of palaeontology. PE uses an external double-blind peer review system for all manuscripts. Copyright of scientific papers is held by one of the three sponsoring professional societies at the author''s choice. Reviews, commentaries, and other material is placed in the public domain. PE papers comply with regulations for taxonomic nomenclature established in the International Code of Zoological Nomenclature and the International Code of Nomenclature for Algae, Fungi, and Plants.