Shionodiscus caspicus sp. nov. (Bacillariophyta, Thalassiosiraceae) from the Caspian Sea and four nomenclatural combinations for Shionodiscus

Q3 Agricultural and Biological Sciences Novosti Sistematiki Nizshikh Rastenii Pub Date : 2024-03-06 DOI:10.31111/nsnr/2024.58.1.a1

R. M. Gogorev, G. V. Kovaleva

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Abstract

The article focuses on a description of a new species, Shionodiscus caspicus Gogorev et Kovaleva, sp. nov., also providing LM and SEM photomicrographs. Based on (sub)central fultoportulae number, the authors distinguish three morphotypes of the species. A comparison with morphologically similar taxa is provided. The new species is similar to S. frenguellii, S. latimarginatus, S. oestrupii, and S. trifultus, but differs in the number of central fultoportulae, as well as the density of marginal fultoportulae and location of rimoportula. The taxonomic features of the genus Shionodiscus are discussed and one of the features — the length of fultoportula — is elaborated and specified in the generic diagnosis. Based on a series of morphological features, such as reduced or absent external tubes of strutted processes and location of rimoportula, the four combinations are proposed: Shionodiscus diporocyclus (Hasle) Gogorev, comb. nov., Shionodiscus ignotus (I. V. Makarova) Gogorev, comb. nov., Shionodiscus maculatus (G. A. Fryxell et J. R. Johans.) Gogorev, comb. nov., Shionodiscus subtilis (Ostenf.) Gogorev, comb. nov.

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来自里海的 Shionodiscus caspicus sp.

文章重点描述了一个新物种--Shionodiscus caspicus Gogorev et Kovaleva，sp. nov.，并提供了 LM 和 SEM 显微照片。作者根据（亚）中央大孔的数量，区分了该物种的三种形态。作者还将其与形态上相似的类群进行了比较。新种与 S. frenguellii、S. latimarginatus、S. oestrupii 和 S. trifultus 相似，但在中央皱孔的数量、边缘皱孔的密度和边缘皱孔的位置上有所不同。本文讨论了 Shionodiscus 属的分类学特征，并对其中一个特征--褶孔的长度--进行了详细阐述，并在属的诊断中予以明确。根据一系列形态特征，如支柱突的外管减少或缺失以及边缘孔的位置，提出了四个组合：Shionodiscus diporocyclus (Hasle) Gogorev，comb. nov.；Shionodiscus ignotus (I. V. Makarova) Gogorev，comb. nov.；Shionodiscus maculatus (G. A. Fryxell et J. R. Johans.) Gogorev，comb. nov.；Shionodiscus subtilis (Ostenf.) Gogorev，comb. nov.。

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来源期刊

Novosti Sistematiki Nizshikh Rastenii Agricultural and Biological Sciences-Plant Science

CiteScore

1.50

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0.00%

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期刊介绍： The Journal is one of the scientific periodicals of the Komarov Botanical Institute (at present belonging to the Russian Academy of Sciences), founded as the garden of medicinal plants by Peter the Great in February 1714. The Journal under the name Novosti sistematiki nizshikh rastenii was founded in 1964 by the botanists of the Komarov Botanical Institute, St. Petersburg (formerly Leningrad). It represents a continuation of Botanicheskie materialy Instituta Sporovykh Rastenii Glavnogo Botanicheskogo Sada RS FSR, Petrograd, vol. 1–4(7), 1922–1926; Botanicheskie materialy otdela sporovyh rastenii Botanicheskogo Instituta imeni V. L. Komarova Akademii Nauk SSSR, Moscow, Leningrad, vol. 5(4/6)–5(10/12), 1940–1945; vol. 6(7/12)–16, 1950–1963, preceded by Botanicheskie materialy Otdela sporvykh rastenii Botanicheskogo Instituta Akademii Nauk SSSR, Moscow, Leningrad vol. 6(1/6), 1949. The Journal publishes original papers on taxonomy, systematics and biodiversity of algae, fungi, lichens and bryophytes.