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15Cryptogamic nomenclatural notes. 6
I. V. Sokolova1 (ed.), N. D. Tseplik2, 3, D. A. Chudaev2
'Komarov Botanical Institute of the Russian Academy of Sciences, St. Petersburg, Russia 2M. V. Lomonosov Moscow State University, Moscow, Russia 3K. A. Timiryazev Institute of Plant Physiology of the Russian Academy of Sciences, Moscow, Russia Corresponding author: N. D. Tseplik, ntseplik@gmail.com
Abstract. The new combination at the rank of species, Gogorevia heterovalva, is published for the diatom variety Achnanthes exigua var. heterovalva.
Keywords: Achnanthes, Achnanthidium, Bacillariophyta, Gogorevia, diatoms, new combination, new status.
Номенклатурные заметки по водорослям, грибам, лишайникам и мохообразным. 6
И. В. Соколова1 (ред.), Н. Д. Цеплик2, 3, Д. А. Чудаев2
'Ботанический институт им. В. Л. Комарова РАН, Санкт-Петербург, Россия
2Московский государственный университет имени М. В. Ломоносова, Москва, Россия 3Институт физиологии растений им. К. А. Тимирязева РАН, Москва, Россия Автор для переписки: Н. Д. Цеплик, ntseplik@gmail.com
Резюме. Обнародована новая комбинация в ранге вида Gogorevia heterovalva для разновидности диатомовой водоросли Achnanthes exigua var. heterovalva.
Ключевые слова: Achnanthes, Achnanthidium, Bacillariophyta, Gogorevia, диатомовые водоросли, новая комбинация, новый статус.
Algae — Водоросли
Transfer of Achnanthes exigua var. heterovalva to the genus Gogorevia (Bacillariophyta). N. D. Tseplik, D. A. Chudaev. — Перенос Achnanthes exigua var. heterovalva в род Gogorevia (Bacillariophyta). Н. Д. Цеплик, Д. А. Чудаев.
The species Achnanthes exigua Grunow Achnanthidium exiguum (Grunow) Czarn.] was originally described by Kutzing (1844) as Stauroneis exilis Kutz. from Trinidad and Tobago, however, the specific epithet exilis was already occupied when Grunow (Cleve, Grunow, 1880) transferred this species to Achnanthes Bory.
Achnanthes exigua var. heterovalva Krasske was described by Krasske (1923) from the walls of a freshwater aquarium. The main diagnostic feature separating it from the type variety was the difference in the striae density between raphe valve (RV) and rapheless valve (RLV). The original material of the variety was re-investigated by
https://doi.org/10.31111/nsnr/2023.57.1.151 Received: 15 February 2023 Accepted: 20 March 2023
Published: 2 April 2023
Cryptogamic nomenclatural notes. 6
Lange-Bertalot et al. (1996) and a lectotype of its name was designated (for LM images of the type specimen see Lange-Bertalot et al., 1996: Taf. 5, Fig. 1). The variety together with the species was placed in the genus Achnanthidium Kütz. by Czarnecki (1994) as Achnanthidium exiguum var. heterovalvum (Krasske) Czarn. with no analysis, probably just based on the wide concept of the genus suggested by Round et al. (1990).
The type material of Achnanthes exigua was recently thoroughly investigated by Taylor et al. (2014), and showed no pronounced difference in the striae density between RV and RLV, in contrast to var. heterovalva. Thus, we consider the latter deserving the status of a species rather than a variety.
A group of species around Achnanthes exigua was recently placed in a new genus Gogorevia Kulikovskiy et al. (Kulikovskiy et al., 2020) based on the integrative morphological and molecular approach. The genus forms a sister clade to Lemnicola Round et Basson within a larger clade of monoraphid diatoms assigned to the family Achnanthidiaceae D. G. Mann. The following combination of characters is diagnostic for Gogorevia: external distal raphe endings deflected in opposite directions, presence of a stauros, uniseriate striae and protracted valve ends. The morphology of Achnanthes exigua var. heterovalva was illustrated by LM and SEM images, e. g., by Chudaev and Gololobova (2016: Pl. 134-135 under the name Lemnicola exigua (Grunow) Kulikovskiy et al.). It is evident from these images and LM images of the lectotype that the taxon is a member of Gogorevia. Summarizing all the facts mentioned above, we propose that Achnanthes exigua var. heterovalva should be transferred to the genus Gogorevia at the rank of species.
Gogorevia heterovalva (Krasske) Tseplik et Chudaev, comb. et stat. nov. Basionym: Achnanthes exigua Grunow var. heterovalva Krasske, 1923, Bot. Archiv, 3(4): 193, Fig. 9a-b.
= Achnanthidium exiguum (Grunow) Czarn. var. heterovalvum (Krasske) Czarn., 1994, Mem. Calif. Acad. Sci., 17, 2: 157.
Acknowledgments
The research of N. D. Tseplik was carried out within the state assignment of the Ministry of Science and Higher Education of the Russian Federation (theme no. 122042700045-3).The research of D. A. Chudaev was carried out as a part of the Scientific Project of the State Order of the Government of Russian Federation to Lo-monosov Moscow State University No. 121032300080-0.
References / Литература
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