A new species of Uronychia (Spirotrichea: Euplotida) from Argentina

Küppers, Gabriela Cristina

doi:10.1016/j.ejop.2020.125706

Cited by 5 publications

(2 citation statements)

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“…This evolutionary trend has led to few morphological characters that can be reliably used as taxonomic markers, making species identification more difficult. However, the species diversity of Euplotida is much higher than expected, and about 20 new species have been added to this order in the past decade (Syberg-Olsen et al, 2016;Boscaro et al, 2019;Küppers, 2020;Lian et al, 2020;Lian et al, 2021;Serra et al, 2020;Zhang et al, 2020;Z ̌ivaljićet al, 2020;Abraham et al, 2021;Valbonesi et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Morphology and molecular phylogeny of two new Aspidisca species (Ciliophora, Spirotrichea, Euplotida) collected from subtropical coastal waters in China

Zheng

Zhao

et al. 2022

Front. Mar. Sci.

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Ciliates are morphologically diverse and highly specialized unicellular eukaryotes that constitute an important component of the microbial food web. Aspidisca Ehrenberg, 1830, is a highly speciose genus that plays key ecological roles in a wide range of environments, and its species diversity has always been a hot spot in protozoan research. In this study, we investigate the living morphology, infraciliature, silverline system, and ribosomal small subunit (SSU rRNA) gene sequences of two new Aspidisca species collected from subtropical coastal waters of China using standard methods. Aspidisca spina sp. n. is characterized by having an obvious peristomial spur, two transparent posterior protrusions, seven frontoventral cirri in “polystyla-arrangement”, and six dorsal ridges. It can be distinguished from the most similar congener, A. magna Kahl, 1932, by the presence of posterior protrusions, more membranelles in the posterior part of adoral zone (AZM2), and different SSU rRNA gene sequences. A. shini sp. n. is smaller in body size, only 35–40 × 25–30 µm in vivo, with four prominent ridges on the arched dorsal side, very similar with the “well-known” species A. steini Buddenbrock, 1920, in morphological characteristics, but it can be distinguished by the arrangement of frontoventral cirri and 121 nucleotide difference in the SSU rRNA gene sequences. Phylogenetic analyses based on the SSU rRNA gene sequences revealed the systematic positions of two new taxa and supported the validity of them as distinct species.

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Section: Introductionmentioning

confidence: 99%

Morphology and molecular phylogeny of two new Aspidisca species (Ciliophora, Spirotrichea, Euplotida) collected from subtropical coastal waters in China

Zheng

Zhao

et al. 2022

Front. Mar. Sci.

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“…As one of the highly cosmopolitan and diverse groups within ciliated protists, euplotid ciliates have been attracting great interest among ciliate researchers. However, the indications suggest that they have indeterminate biodiversity (Song, 1997;Küppers, 2020;Lian et al, 2020;Mendez-Sanchez et al, 2020). As research is developed and extended, more detailed macroscopic and microscopic characteristics are crucial for improving the identification and documentation of euplotid ciliates (Warren et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Ultrastructural Features of an Abundant and Ubiquitous Marine Ciliate, Uronychia binucleata (Protista, Ciliophora, Euplotida)

et al. 2020

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The ciliate genus Uronychia is a marine group with extremely differentiated cortical and ciliary structures. These structures define its unique evolutionary position in the whole subclass Euplotia. However, to date, few data about the ultrastructure of this genus and related taxa is available. In the present work, a dominant species, Uronychia binucleata, was investigated using scanning electron microscopy and transmission electron microscopy. The findings are as follows: (i) this species lacks the typical alveolar plate in its cortex, whereas the abundant electron-lucent vesicular structures occurred densely; (ii) the subpellicular microtubules form a triad configuration in the dorsal side, while appearing in a single configuration in the ventral side; (iii) the cortical granules are extrusomes, which represent a kind of mucocyst instead of ampules; (iv) two kinetosomes in different rows of one cirrus are linked by the single longitudinal connection; (v) the undulating membrane is highly developed and their insides and outsides are partially covered by the cortical flap; (vi) the single-membrane-bound pharyngeal disks interposed with microtubular sheets, and are distributed in three distinct zones. This first detailed report about the ultrastructural features of the genus Uronychia will be a key to improve the diagnosis and systematics of this widely distributed and ecologically important genus and its family Uronychiidae.

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TEM: Sample Preparation, Fixation, and Staining of Protists

Saha

2024

Springer Protocols Handbooks

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A new species of Uronychia (Spirotrichea: Euplotida) from Argentina

Cited by 5 publications

References 10 publications

Morphology and molecular phylogeny of two new Aspidisca species (Ciliophora, Spirotrichea, Euplotida) collected from subtropical coastal waters in China

Morphology and molecular phylogeny of two new Aspidisca species (Ciliophora, Spirotrichea, Euplotida) collected from subtropical coastal waters in China

Ultrastructural Features of an Abundant and Ubiquitous Marine Ciliate, Uronychia binucleata (Protista, Ciliophora, Euplotida)

TEM: Sample Preparation, Fixation, and Staining of Protists

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