About the systematics of Palaearctic Eurytemora (Copepoda, Calanoida) based on morphological analysis, with focus on Eurytemora gracilicauda Akatova, 1949

Elena Fefilova; Natalia Sukhikh; Ekaterina Abramova; Ilya Velegzhaninov

About the systematics of Palaearctic Eurytemora (Copepoda, Calanoida) based on morphological analysis, with focus on Eurytemora gracilicauda Akatova, 1949

In: Studies on Eurytemora

Authors:

Elena Fefilova

Elena Fefilova Institute of Biology, Komi Science Centre, Ural Division, Russian Academy of Sciences, Syktyvkar, 167982 Russia

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Natalia Sukhikh

Natalia Sukhikh Zoological Institute of the Russian Academy of Sciences, St. Petersburg, Russia

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Ekaterina Abramova

Ekaterina Abramova Lena Delta Nature Reserve, Tiksi, Sakha Republic, Russia

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, and

Ilya Velegzhaninov

Ilya Velegzhaninov Institute of Biology, Komi Science Centre, Ural Division, Russian Academy of Sciences, Syktyvkar, 167982 Russia
Polytechnical Institute, Vyatka State University, Kirov, Russia

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Type:: Chapter

Pages:: 59–75

DOI:: https://doi.org/10.1163/9789004465565_007

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Abstract

We studied the morphology of Eurytemora from inland waters at the shores of the White and Pechora seas and from the Lena River delta, and revealed a ubiquitous presence of Eurytemora gracilicauda Akatova, which results we confirmed with genetic data. We found this species for the first time in the Pechora Sea basin. In the White Sea basin, this species was previously described as E. brodskyi Kos, with the name that we suggest is a junior synonym of E. gracilicauda. E. gracilicauda differs from the co-living species: E. lacustris (Poppe), E. arctica Wilson M. S. & Tash, and E. raboti Richard, by the structure and armament of the caudal rami and the fifth legs (P5) of males and females. The caudal rami of both males and females were elongated. The female caudal rami showed a surface covered by spines. The male caudal rami were bare, or with rare spines on the sides. The appendages of the female P5 were also elongated: the length of the inner spine on the distal exopod segment was 2.27 ± 0.12 times as long as the outer spine; the exopod of the male right P5 had a specific trigonal ledge with a short spinule, and the coxopods (both or at least one) had groups of spinules. The morphometric parameters of the females were quite stable, while those of the male showed high variability within and between populations (CV = 11.5-43.5%). Similarities and differences of E. gracilicauda and three allochoric Eurytemora species were analysed, and the results presented herein.

Résumé

Nous avons étudié la morphologie de Eurytemora des eaux intérieures des rives de la mer Blanche et de la mer de Petchora ainsi que du delta de la Lena, et nous avons mis en évidence la présence constante de Eurytemora gracilicauda Akatova, et ces résultats ont été confirmés par les données génétiques. Nous avons trouvé cette espèce pour la première fois dans le bassin de la mer de Petchora. Dans le bassin de la mer Blanche, cette espèce était auparavant décrite comme E. brodskyi Kos, que nous suggérons être un synonyme junior de E. gracilicauda. E. gracilicauda diffère des espèces E. lacustris (Poppe), E. arctica Wilson M.S. & Tash, et E. raboti Richard, par la structure et l’armature des rames furcales et par les cinquièmes pattes (P5) des mâles et des femelles. Les rames furcales des mâles et des females sont allongées. Les rames furcales de la femelle ont une surface couverte d’épines ; Les rames furcales du mâle sont glabres, ou avec de rares épines sur les côtés. Les appendices de la P5 femelle sont également allongées : l’épine interne du segment distal de l’exopodite est 2,27 ± 0,12 fois aussi longue que l’épine externe, l’exopodite de la P5 mâle droite a un rebord triangulaire particulier avec une spinule courte, et les coxopodites (les deux ou au moins un) présentent des groupes de spinules. Les paramètres morphométriques des femelles sont tout à fait stables, tandis que ceux des mâles montrent une variabilité au sein d’une même population et entre les populations (CV = 11,5-43,5%). Les similarités et les différences entre E. gracilicauda et les trois espèces allochoriques de Eurytemora ont été analysées, et les résultats présentés ici.

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Studies on Eurytemora

Proceedings of the Eurytemora Conference, St. Petersburg, 2019

Series: Crustaceana Monographs, Volume: 23

E-Book ISBN:: 9789004465565

Publisher:: Brill

Print Publication Date:: 08 Jun 2021

Subjects
- Biology
  - Zoology
  - Carcinology

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About the systematics of Palaearctic Eurytemora (Copepoda, Calanoida) based on morphological analysis, with focus on Eurytemora gracilicauda Akatova, 1949

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Résumé

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Studies on Eurytemora

Proceedings of the Eurytemora Conference, St. Petersburg, 2019

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