An analysis of published data on Cyclotella rossii and С. chantaica has shown general morphological similarity and coincidence of the majority of quantitative and qualitative characters. They are valve diameter, frequency of marginal fultoportulae and number of satellite pores in them, number of central fultoportulae and number of their satellite pores, number of rimoportulae and valve relief, presence of externally colliculatelly, position of rimoportula and its fissure orientation respectively Based on this data and priority the name С. chantaica, it is suggested to treat C. rossii as a synonym of С. chantaica and, considering the latest changes in their systematic position, expand the diagnosis of the species Pantocsekiella chantaica (Kuzmina et Genkal) KT Kiss, Genkal et Acs emend. Genkal.

Анотація наукової статті з біологічних наук, автор наукової роботи - Genkal S.I.


До морфології і систематики Cyclotella rossii (Bacillariophyta)

Аналіз літературних даних показав загальне морфологічну схожість і збіг більшості кількісних (діаметр стулки, частота розташування крайових виростів і число опор у останніх, число центральних виростів і число опор у них, число двогубий виростів) і якісних (рельєф стулки, наявність горбкуват з зовнішнього боку, , розташування двугубим виросту і орієнтація його щілини) ознак Cyclotella rossii і С. chan-taica. На основі цих даних і пріоритету останньої назви пропонується звести C. rossii в синоніміку до С. chantaica і, з урахуванням останніх змін в їх систематичне положення, розширити діагноз виду Pantocsekiella chantaica (Kuzmina et Genkal) K. T. Kiss, Genkal et Acs emend. Genkal.


Область наук:
  • біологічні науки
  • Рік видавництва: 2019
    Журнал
    Новини систематики нижчих рослин

    Текст наукової роботи на тему «ON THE MORPHOLOGY AND TAXONOMY OF CYCLOTELLA ROSSII (BACILLARIOPHYTA)»

    ?On the morphology and taxonomy of Cyclotella rossii (Bacillariophyta)

    S. I. Genkal

    Institute for Biology of Inland Waters RAS, Borok, Yaroslavl Region, Russia Corresponding author. S. I. Genkal, Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.

    Abstract. An analysis of published data on Cyclotella rossii and С. chantaica has shown general morphological similarity and coincidence of the majority of quantitative and qualitative characters. They are valve diameter, frequency of marginal fultoportulae and number of satellite pores in them, number of central fultoportulae and number of their satellite pores, number of rimoportulae and valve relief, presence of externally colliculatelly, position of rimoportula and its fissure orientation respectively. Based on this data and priority the name С. chantaica, it is suggested to treat C. rossii as a synonym of С. chantaica and, considering the latest changes in their systematic position, expand the diagnosis of the species Pantocsekiella chantaica (Kuzmina et Genkal ) KT Kiss, Genkal et Acs emend. Genkal.

    Keywords: Bacillariophyta, Cyclotella rossii, Cyclotella chantaica, frustules morphology, taxonomy.

    K морфології і систематики Cyclotella rossii (Bacillariophyta)

    С. І. Генкай

    Інститут біології внутрішніх вод ім. І. Д. Папаніна РАН, Борок, Ярославська обл., Росія Автор для листування. С. І. Генкай, Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.

    Резюме. Аналіз літературних даних показав загальне морфологічну схожість і збіг більшості кількісних (діаметр стулки, частота розташування крайових виростів і число опор у останніх, число центральних виростів і число опор у них, число двогубий виростів) і якісних (рельєф стулки, наявність горбкуват з зовнішнього боку, , розташування двугубим виросту і орієнтація його щілини) ознак Cyclotella rossii і С. chantaica. На основі цих даних і пріоритету останньої назви пропонується звести C. rossii в синоніміку до С. chantaica і, з урахуванням останніх змін в їх систематичне положення, розширити діагноз виду Pantocsekiella chantaica (Kuzmina et Genkal) K. T. Kiss, Genkal et Acs emend. Genkal.

    Ключові слова: Bacillariophyta, Cyclotella rossii, Cyclotella chantaica, морфологія панцира, таксономія.

    The species Cyclotella rossii Hakansson was described using materials from a Swedish lake Laxa (Hakansson, 1990). The species belongs to small-sized forms (valve diameter 5-18 | im) and is characterized by 2-5 (rarely more) radial rows of puncta (Hakansson, 1990). Krammer, Lange-Bertalot (1991) gave a similar short diagnosis of this species. A detailed description of C. rossii with many light and electron microscopy micrographs was presented in a monograph by Houk et al. (2010). Other quantitative

    https://doi.org/1031111/nsnr/2019.532.241

    241

    (Number of striae in 10 jm, frequency of marginal fultoportulae and number of satellite pores in them, number of central fultoportulae and number of their satellite pores, number of rimoportulae) and qualitative (structure of alveoli, copula and central area) features were added to the diagnosis (Houk et al., 2010). Later, based on the study of numerous materials from lakes and rivers in the Republic of Karelia, the species diagnosis was refined (Genkal, Chekryzheva, 2016). Over the last few years, the systematic position of C. rossii has been repeatedly changed - at first, this species was transferred to the genus Lindavia (Schutt) De Toni et Forti as L. rossii (Hakansson) Nakov, Gullo-ry, Julius , Theriot et Alverson (Nakov et al., 2015), then - to the genus Pantocsekiella KT Kiss et E. Acs as P. rossii (Hakansson) KT Kiss et Acs (Acs et al, 2016). In 1989, based on materials from the Khantaika River, a new species was described - Cyclotella chantaica Kuzmina et Genkal. Morphologically this species is very similar to C. rossii (Genkal, Kuzmina, 1989). Later it was also transferred at first to the genus Lindavia (Nakov et al., 2015), and then - to Pantocsekiella (Acs et al., 2016).

    The aim of this publication is a comparative analysis of morphology of two above mention species with taxonomical resolutions.

    As shown in Table, ranges of variability of quantitative features in P. rossii and P. chantaica coincide, except for the number of striae in 10 jm. Higher values ​​of this characteristic can be associated with interpopulation variability - as the valve diameter decreases, the number of striae in 10 jm increases (Genkal, Popovskaya, 2004; Genkal, 2014; Genkal, Chekryzheva, 2016). C. chantaica valves are flat, externally col-liculate, mainly with several radial rows of punctae of unequal size ± shallow furrows or chaotically arranged, (Genlal, Kuzmina, 1989, figs 6-9), which is characteristic of C. rossii ( Hakansson, 1990, figs 47-49; Houk et al., 2010 pl. 207, figs 1-6, pl. 208, figs 1-6, pl. 209, figs 1, 2; Genkal, Chekryzheva, 2016, figs 1-26). The rimoportula position and orientation in C. rossii varies to a large extent (Genkal, Chekryzheva, 2016, Figs 29-38). In C. chantaica the process occurs near alveoli and its fissure is oriented either at an angle or perpendicular to them (Genlal, Kuzmina, 1989, figs 11, 12), like in C. rossii. Auxospores are found in C. chantaica (Genlal, Kuzmina, 1989, figs 13, 14). In the first description of C. rossii (Hakansson, 1990) and works by some researchers (Houk et al., 2010 року; Genkal, Chekryzheva, 2016), there is no information on coloniality of this species. According to the diagnosis (Genkal, Kuzmina, 1989), C. chantaica may occur as solitary cells as well as in colonies.

    The stated above makes it possible to consider C. rossii to be conspecific with C. chan-taica and, consequently, a synonym of the latter, as well as refine its diagnosis. Considering the latest taxonomic changes, an extended diagnosis of this species is presented.

    Pantocsekiella chantaica (Kuzmina et Genkal) K. T. Kiss, Genkal et Acs emend. Genkal = Cyclotella chantaica Kuzmina et Genkal, 1989, Biologia vnutrennikh vod. Infor-matsionnyy byulleten 4: 9. = Lindavia chantaica (Kuzmina et Genkal) Nakov, Gullory, Julius, Theriot et Alverson, 2015-го, Phytotaxa 217 (3): 254. = Pantocsekiella chantaica (Kuzmina et Genkal) KT Kiss, Genkal et Acs , 2016, Fottea, Olomouc 16 (1): 65.

    Table

    The variability of morphological features in Cyclotella rossii and C. chantaica according

    to published data

    Features Reference

    Valve diameter, | im Number of striae in 1G | im Number of central fultoportulae Number of satellite pores in central furtoportulae Marginal fultoportulae arrangement Number of satellite pores in marginal fultoportulae Number of rimoportulae Number of radial rows of pucta in the central area

    Cyclotella rossii

    5-18 2-5, rarely more Hakansso, 199G

    5-18 Krammer, Lange-Bertalot, 1991

    9.5-16 14-16 2 On every 3-5 costae Genkal et al., 1997; Genkal, Yeshko, 1998.

    5-18 2-5, rarely more Hakansson, 2GG2

    5-18 16-18 2-3 (5) 2 On every 2-3 (5) costae 2 1 2-8 Houk et al, 2G1G

    5-31 12-25 1-13 2 (rarely 1 or 3) On every 2-8 costae 2 1 (rarely 2) 2-8 Genkal, Chekryzheva, 2G16

    Cyclotella chantaica

    3.421.8 18-35 1-5 2 On every 3-8 costae 2 1 Genkal, Kuzmina, 1989

    = Cyclotella kuetzingiana var. radiosa Fricke in Schmidt 1900 Atlas der diatoma-ceenkunde 56: pl. 222, fig.8.

    = Cyclotella rossii Hakansson, 1990, Diatom Research 5 (2): 267. = Lindavia rossii (Hakansson) Nakov, Gullory, Julius, Theriot et Alverson, 2015-го, Phytotaxa 217 (3): 258. = Pantocsekiella rossii (Hakansson) KT Kiss et Acs, 2016, Fottea, Olomouc 16 (1): 68.

    = Cyclotellapalustris Genkal et Kulikovskiy, 2008, Botanicheskii Zhurnal 93 (5): 773. Cells cylindrical, 3.4-31 | im in diam., Solitary or in colonies (4-41 cells). Striae of nearly equal lengths 12-35 in 10 | im. Marginal fultoportulae are situated on every, slighty depressed, 2-8 costae, Externally with a simple opening, internally with a short central tube surrounded laterally by two satellite pores. A single rimoportula (sometimes two) situated in the marginal area, external with a small opening on a shortened costa, internally with a sessile labium having a relatively wide radial, oblique or cir-cumferentially oriented slit. The central area in nearly flat, externally colliculate, more often with several radial rows of puncta of unequal size ± shallow furrows or chaotically, 1-13 fultoportulae situated eccentrically near the center or in the shape of ring, with a small, simple external opening , internally with short central tube surrounded by 2 (rarely 1-3) satellite pores. The girdle band is smooth, composed of several cop-ulae. There are auxospores.

    Acknowledgements

    This study was conducted in the framework of the Institutional research project "Systematics, diversity and phylogeny of aquatic autotrophic organisms in Russia and other regions of the world" (AAAA-A18-118012690095-4) and RFBR proj ect 19-04-00280_a.

    References

    Acs E., Ari E., Duleba M., Dressler M., Genkal S. I., Jako E., Rimet F., Ector L., Kiss K. T. 2016. Pantocsekiella, a new centric diatom genus based on morphological and genetic studies. Fottea, Olomouc 16 (1): 56-78. https://doi.org/10.5507/fot.2015.028

    Genkal S. I. 2014. Morphology, taxonomy, ecology and distribution of Cyclotella meduanae Germain

    (Bacillariophyta). Nova Hedwigia. Beiheft 143: 127-140. Genkal S. I., Chekryzheva T. A. 2016. On the morphology, taxonomy, ecology and distribution of Cyclotella rossii Hakansson (Bacillariophyta). Nova Hedwigia 102 (3-4): 399-421. https://doi.org/10.1127/nova_hedwigia/2015/0316

    Genkal S. I, Kuzmina A. E. 1989. About new species of the genus Cyclotella Kutz. (Bacillariophyta).

    Biologia vnutrennikh vod. Informatsionnyy byulleten 84: 9-11. (In Russ.). Genkal S. I., Popovskaya G. I. 2004. Morphological variability and taxonomy of the Baikal endemics from the genus Cyclotella Kutz. (Bacillariophyta). International Journal on Algae 6 (2): 101-115. https://doi.org/10.1615/InterJAlgae.v6.i2.10

    Hakansson H. 1990. A comparison of Cyclotella krammeri sp. nov. and C. schumannii Hakansson with similar species. Diatom Research 5 (2): 261-271. https://doi.org/10.1080/0269249X.1990.9705118 Houk V, Klee R., Tanaka H. 2010. Atlas of freshwater centric diatoms with a brief key and descriptions. Part 3. Stephanodiscaceae. A. Cyclotella, Tertiarius, Discostella. Fottea 10 (Supplement): 1-498.

    Krammer K., Lange-Bertalot H. 1991. Bacillariophyceae 3. Teil: Centrales, Fragilariaceae, Eunotia-ceae. Susswasserflora von Mitteleuropa. Bd. 2/3. Stuttgart, Jena: 576 S.

    Nakov T., Gullory W. X., Theriot E. C., Alverson A. J. 2015. Towards a phylogenetic classification of species belonging to the diatom genus Cyclotella (Bacillariophyceae): Transfer of species formerly placed in Puncticulata, Handmannia, Pliocaenicus and Cyclotella to the genus Lindavia. Phytotaxa 217 (3): 249-264. https://doi.org/10.11646/phytotaxa.217.3.2

    література

    Acs E., Ari E., Duleba M., Dressler M., Genkal S. I., Jako E., Rimet F., Ector L., Kiss K. T. 2016. Pantocsekiella, a new centric diatom genus based on morphological and genetic studies. Fottea, Olomouc 16 (1): 56-78. https://doi.org/10.5507/fot.2015.028

    Genkal S. I. 2014. Morphology, taxonomy, ecology and distribution of Cyclotella meduanae Germain (Bacillariophyta). Nova Hedwigia. Beiheft 143: 127-140.

    Genkal S. I., Chekryzheva T. A. 2016. On the morphology, taxonomy, ecology and distribution of Cyclotella rossii Hakansson (Bacillariophyta). Nova Hedwigia 102 (3-4): 399-421. https://doi.org/10.1127/nova_hedwigia/2015/0316

    [Genkal, Kuzmina] Генкай С. І., Кузьміна А. Е. 1989. Про новий вид з роду Cyclotella Kutz. (Bacillariophyta). Біологія внутрішніх вод. Інформаційний бюлетень 84: 9-11.

    Genkal S. I., Popovskaya G. I. 2004. Morphological variability and taxonomy of the Baikal endemics from the genus Cyclotella Kutz. (Bacillariophyta). International Journal on Algae 6 (2): 101-115. https://doi.org/10.1615/InterJAlgae.v6.i2.10

    Hakansson H. 1990. A comparison of Cyclotella krammeri sp. nov. and C. schumannii Hakansson with similar species. Diatom Research 5 (2): 261-271. https://doi.org/10.1080/0269249X.1990.9705118

    Houk V, Klee R., Tanaka H. 2010. Atlas of freshwater centric diatoms with a brief key and descriptions. Part 3. Stephanodiscaceae. A. Cyclotella, Tertiarius, Discostella. Fottea 10 (Supplement): 1-498.

    Krammer K., Lange-Bertalot H. 1991. Bacillariophyceae 3. Teil: Centrales, Fragilariaceae, Eunotia-ceae. Susswasserflora von Mitteleuropa. Bd. 2/3. Stuttgart, Jena: 576 S.

    Nakov T., Gullory W. X., Theriot E. C., Alverson A. J. 2015. Towards a phylogenetic classification of species belonging to the diatom genus Cyclotella (Bacillariophyceae): Transfer of species formerly placed in Puncticulata, Handmannia, Pliocaenicus and Cyclotella to the genus Lindavia. Phytotaxa 217 (3): 249-264. https://doi.org/10.11646/phytotaxa.217.3.2


    Ключові слова: BACILLARIOPHYTA / CYCLOTELLA ROSSII / CYCLOTELLA CHANTAICA / FRUSTULES MORPHOLOGY / TAXONOMY / МОРФОЛОГІЯ панцир / таксономії

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