Bathynella bazikalovae sp. n. and Bathynella rara sp. n. (Crustacea, Syncarida, Bathynellidae) from lake Baikal

Мұқаба

Дәйексөз келтіру

Толық мәтін

Ашық рұқсат Ашық рұқсат
Рұқсат жабық Рұқсат берілді
Рұқсат жабық Тек жазылушылар үшін

Аннотация

Illustrated descriptions of two species of the genus Bathynella Vejdovsky, 1882 are presented: B. bazikalovae Alekseeva, Krivorotkin et Timoshkin sp. n. and B. rara Alekseeva, Krivorotkin et Timoshkin sp. n. Both species are endemic to Lake Baikal. The first species was found in large numbers in the coastal zone of Bolshiye Koty Bay: in the splash zone, as well as in the depth range from the cutoff to 0.5 m in sandy substrate. The second species was found on the underwater Akademichesky Ridge at a depth of 350 m, in oxidized silt with dead Cladocera (their shells and ephippia) and diatoms. The morphology of the new species was studied in detail using both scanning electron and light microscopy. An extensive comparison of the new species between themselves and with B. baicalensis Bazikalova, 1954 is given. The species differ in the armament of thoracopods 1–7, the structure of thoracopod 8 of females and males, the armament of the uropods and pleopods, and other morphological features. These discoveries confirm earlier assumptions concerning a much greater species richness of the bathynellid fauna of Lake Baikal.

Авторлар туралы

T. Alekseeva

Limnological Institute, Russian Academy of Sciences

Хат алмасуға жауапты Автор.
Email: atm171@mail.ru
Ресей, Irkutsk, 664033

R. Krivorotkin

Limnological Institute, Russian Academy of Sciences

Email: atm171@mail.ru
Ресей, Irkutsk, 664033

O. Timoshkin

Limnological Institute, Russian Academy of Sciences

Email: atm171@mail.ru
Ресей, Irkutsk, 664033

Әдебиет тізімі

  1. Базикалова А.Я., 1949. Находка в озере Байкал интересного ракообразного // Природа. № 7. С. 63–64.
  2. Базикалова А.Я., 1954. Новые виды рода Bathynella из озера Байкал // Труды Байкальской лимнологической станции. Т. 14. С. 355–368.
  3. Бирштейн Я.А., Левушкин С.И., 1967. Отряд Bathynellacea (Crustacea, Malocostraca) в СССР. I. Семейство Bathynellidae // Бюллетень Московского общества испытателей природы. Отдел биологический. Т. 72. № 4. С. 51–66.
  4. Перетолчина Т.Е., Наумова Т.В., Ситникова Т.Я., 2024. Первые сведения о генетическом разнообразии и филогенетических взаимоотношениях батинеллид (Malacostraca: Bathynellidae) из озера Байкал // Limnology and Freshwater Biology. № 5. С. 1318–1336.
  5. Тахтеев В.В., Окунева Г.Л., Книжин И.Б., 2000. О распространении батинеллид (CrustaceaBathynellacea) в Байкальском регионе // Исследования водных экосистем Восточной Сибири. Иркутск: Изд-во Иркутского ун-та. С. 101–103.
  6. Тубранов И.С., 2016. Отряд Bathynellacea Chappuis, 1915 (Crustacea: Malacostraca) фауны России и сопредельных государств: степень изученности и перспективы исследования // Материалы Всероссийской молодежной гидробиологической конференции “Перспективы и проблемы современной гидробиологии”, Борок, 10–13 ноября 2016 г. Ярославль: Филигрань. С. 147–149.
  7. Camacho A.I., 2006. An annotated checklist of the Syncarida (Crustacea, Malacostraca) of the world // Zootaxa. V. 1374. P. 1–54.
  8. Camacho A.I., Mas-Peinado P., Iepure S., Perina G., Dorda B.A. et al., 2020. Novel sexual dimorphism in a new genus of Bathynellidae from Russia, with a revision of phylogenetic relationships // Zoologica Scripta. V. 49. P. 47–63.
  9. Camacho A.I., Mas-Peinado P., Reddy Y.R., Bandari E., Shaik S., Perina G, Dorda B.A., Casado A., Rey I., 2021. An integrated approach to re-evaluate the validity of the family Leptobathynellidae (Crustacea: Bathynellacea) // Zoological Journal of the Linnean Society. V. 192. № 3. P. 853–895.
  10. Drewes J., Schminke H.K., 2011. Number of families within Bathynellacea (Malacostraca) and year of publication of their names, with redescription of Baicalobathynella magna (Bazikalova, 1954) from Lake Baikal // Crustaceana. V. 84. P. 1377–1401.
  11. Schminke H.K., 1973. Evolution, System und Verbreitungsgeschichte der Familie Parabathynellidae (Bathynellacea, Malacostraca) // Akademie der Wissenschaften und Literatur Mainz, mathematischnaturwissenschaftliche Klasse, Mikrofauna Meeresboden. V. 24. P. 1–192.
  12. Serban E., 1972. Bathynella (Podophallocarida, Bathynellacea) // Travaux de l’Institut de Spéologie “Emile Racovitza”. V. 11. P. 11–224.
  13. Serban E., 2000. Uenobathynella n.g., Parauenobathynella n.g., Morimotobathynella n.g., Nihobathynella n.g. et Paradoxibathynella n.g., Bathynellinae du Japón (Bathynellidae, Bathynellacea, Podophallocarida) // Travaux de l’Institut de Spéologie “Émile Racovitza”. V. 36. P. 3–61.

Қосымша файлдар

Қосымша файлдар
Әрекет
1. JATS XML
Жүктеу
2. Fig. 1. Bathynella bazikalovae sp. n., female appearance, lateral. Segments: I–VIII – thoracic, I*–VI* – abdominal. Scale bar 200 µm.

Жүктеу (61KB)
Метадеректер
3. Fig. 2. Bathynella bazikalovae sp. n., SEM photographs of the external appearance of females (A, B), lateral view. Scale bar 500 µm.

Жүктеу (70KB)
Метадеректер
4. Fig. 3. Bathynella bazikalovae sp. n., female, A1 (A) and A2 (B). I–VII – segments. Scale bar 100 µm.

Жүктеу (56KB)
Метадеректер
5. Fig. 4. Bathynella bazikalovae sp. n., female oral appendages: A, B – Md; C, D – anterior part of Md (pars incisiva and gnathobase frontally); E – Mxl; F, G – paragnaths; H – Mx. Scale bar 100 µm.

Жүктеу (74KB)
Метадеректер
6. Fig. 5. Bathynella bazikalovae sp. n., female limbs: A – Tp1, B – Tp2, C – Tp3. Scale bar 100 µm.

Жүктеу (94KB)
Метадеректер
7. Fig. 6. Bathynella bazikalovae sp. n., female limbs: A – Tp4, B – Tp5, C – Tp6, D – Tp7. Scale bar 100 µm

Жүктеу (112KB)
Метадеректер
8. Fig. 7. Bathynella bazikalovae sp. n., female (A, G, H) and male (B–F) limbs: A–E – Tp8, F–H – Pl. In H, the boundaries of broken setae are shown in blue. Scale bar is 100 µm.

Жүктеу (79KB)
Метадеректер
9. Fig. 8. Bathynella bazikalovae sp. n., SEM photographs of female limbs: A, B – Tp1–Tp7, lateral; C – Tp8, ventral; D – Pl, ventral; E – distal segments A1, A2; F – segments in the center of A1. III–VII – segments. Scale bar, µm: A – 100, B – 50, C–F – 40.

Жүктеу (259KB)
Метадеректер
10. Fig. 9. Bathynella bazikalovae sp. n., SEM photographs of the pleotelson (A) and Fu (B–D) of the female. In C, D, the arrows indicate the tubular pore. Scale, µm: A, B, D – 40; C – 20.

Жүктеу (220KB)
Метадеректер
11. Fig. 10. Bathynella bazikalovae sp. n., SEM photographs of Up (A), pleotelson (B) and endopodites of Up (C–F). Scale, µm: A, F – 50; B – 100; C–E – 40.

Жүктеу (186KB)
Метадеректер
12. Rice. 11. Bathynella bazikalovae sp. n. (C–E) and Bathynella rara sp. n. (A, B): Up (A, C) and Fu (B, D, E) females. Scale 100 µm.

Жүктеу (76KB)
Метадеректер
13. Fig. 12. Bathynella rara sp. n. female appearance, lateral. Segments: I–VIII – thoracic, I*–VI* – abdominal. Scale bar 400 µm.

Жүктеу (39KB)
Метадеректер
14. Fig. 13. Bathynella rara sp. n., A1 (A) and A2 (B) females. Scale bar 100 µm.

Жүктеу (57KB)
Метадеректер
15. Fig. 14. Bathynella rara sp. n., female oral appendages: A – Md, B – pars incisiva and gnathobase Md, C – Mxl, D – Mx, E – paragnath. Scale bar 100 µm.

Жүктеу (72KB)
Метадеректер
16. Fig. 15. Bathynella rara sp. n., female (B–E) and male (A, F) limbs: A, B – Tp8; C–F – Pl. In C, E and F, the boundaries of broken setae are shown in blue. Scale bar is 100 µm.

Жүктеу (66KB)
Метадеректер
17. Fig. 16. Mandibles (Md), uropods (Up) and furcal rami (Fu) of females: Bathynella baicalensis Bazikalova 1954 (A–C), Bathynella bazikalovae sp. n. (D–L) and Bathynella rara sp. n. (M–S): A – Md; B, D–G, M–P – Up; C, H–L, Q–S – Fu. A–C – after Bazikalova, 1954. Plumage is not shown in all figures. Damaged parts are shown in blue in D, F, G, M–O. Scale bar is 200 µm.

Жүктеу (91KB)
Метадеректер
18. Fig. 17. Bathynella bazikalovae sp. n. (A–C) and Bathynella rara sp. n. (D) photomicrographs of the external appearance of females, laterally (A, C, D) and dorsally (B), live (B, C) and fixed (A, D). Scale bar 500 µm.

Жүктеу (83KB)
Метадеректер
19. Fig. 18. Bathynella bazikalovae sp. n. (A–D) and Bathynella rara sp. n. (E), photomicrographs of the reproductive system (A, B) and intestinal contents (C–E). In A, the outlines of the ovaries and a large developing egg are shown separately. Scale bar is 100 µm.

Жүктеу (145KB)
Метадеректер

© Russian Academy of Sciences, 2025