New and rare species of microturbellarians of the genus Opisthocystis Sekera, 1911 (Plathelminthes, Kalyptorhynchia, Polycystididae) from lake Baikal

Мұқаба

Дәйексөз келтіру

Толық мәтін

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

Аннотация

Descriptions of four new species of the genus Opisthocystis Sekera, 1911 are given: Opisthocystis zaytsevae Krivorotkin et Timoshkin sp. n., Opisthocystis strictostylus Krivorotkin et Timoshkin sp. n., Opisthocystis sekeri Krivorotkin et Timoshkin sp. n. and Opisthocystis tenuistylus Krivorotkin et Timoshkin sp. n., all of them endemic to Lake Baikal. The former three species were found in the coastal zone of the lake: O. zaytsevae: in the shallow waters of Bolshoy Ushkany Island; O. strictostylus: in the shallow waters of Ayaya Bay (northern basin) and opposite the village of Khuzhir (Olkhon Island, Maloye More Strait); O. sekeri: in the shallow waters of Onokochanskaya Bay (northern basin); O. tenuistylus was found on the underwater Akademichesky Ridge at a depth of about 350 m. Illustrated descriptions, differential diagnoses, brief information on their distribution and ecology are provided for all new species. New extensive information on the morphology and zoogeography of three rare and poorly studied endemic Baikal species of the same genus is provided: Opisthocystis multifidus (Nasonov, 1935), Opisthocystis octopropagostylus Lukhnev et Timoshkin, 2014, and Opisthocystis cf. umylinae Timoshkin, 2010. Brief illustrated descriptions and generalized information on their distribution are provided for all species. Revision of the taxonomic status of five Baikal species is proposed: Opisthocystis bilobatus Nasonov, 1935, Opisthocystis bicurvatus Nasonov, 1935 Opisthocystis campanulatus Nasonov, 1935, Opisthocystis irregularis Nasonov, 1935 and Opisthocystis trifida Nasonov, 1935. These species were described very briefly, and the drawings were very schematic. Based on the poor descriptions and schematic drawings, their reliable identification is impossible. In this regard, we are compelled to assign the status of nomen nudum to the above species of N. V. Nasonov.

Толық мәтін

Рұқсат жабық

Авторлар туралы

R. Krivorotkin

Limnological Institute, Russian Academy of Sciences

Хат алмасуға жауапты Автор.
Email: roman_bio@mail.ru
Ресей, st. Ulaanbaatar, 3, Irkutsk, 664033

O. Timoshkin

Limnological Institute, Russian Academy of Sciences

Email: roman_bio@mail.ru
Ресей, st. Ulaanbaatar, 3, Irkutsk, 664033

Әдебиет тізімі

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Қосымша файлдар

Қосымша файлдар
Әрекет
1. JATS XML
Жүктеу
2. Fig. 1. Scheme of measurement and structure of stylet sections of opisthocystis using the example of stylet of Opisthocystis zaytsevae Krivorotkin et Timoshkin sp. n.: A – stylet; B – funnel-shaped section of stylet, top view; C – proximal part of stylet.

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3. Fig. 2. Schemes of the arrangement of some internal organs in the holotypes of new species: A – Opisthocystis zaytsevae Krivorotkin et Timoshkin sp. n., B – Opisthocystis strictostylus Krivorotkin et Timoshkin sp. n. Scale 400 µm.

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4. Fig 3. Opisthocystis zaytsevae Krivorotkin et Timoshkin sp. n., stylets: A – holotype, B – paratype No. 1, C – paratype No. 2, D – paratype No. 4, E – paratype No. 6, F – paratype No. 10, G – paratype No. 12, H – paratype No. 15, I – paratype No. 18. Scale 100 µm.

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5. Fig. 4. Opisthocystis zaytsevae Krivorotkin et Timoshkin sp. n., stylets: A – holotype, B – paratype No. 4, C – paratype No. 5, D – paratype No. 6, E – paratype No. 11. Scale 100 µm.

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6. Fig. 5. Opisthocystis zaytsevae Krivorotkin et Timoshkin sp. n., distal tips of stylets: A – holotype, B – paratype #2, C – paratype #3, D – paratype #4, E – paratype #5, F – paratype #6, G – paratype #13, H – paratype #15, I – paratype #20. Scale bar 25 µm.

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7. Fig. 6. Opisthocystis strictostylus Krivorotkin et Timoshkin sp. n., stylets: A – holotype, B – paratype No. 7, C – paratype No. 8, D – paratype No. 1, E – paratype No. 2, F – paratype No. 9, G – paratype No. 10, H – paratype No. 11. Scale 100 µm.

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8. Fig 7. Opisthocystis strictostylus Krivorotkin et Timoshkin sp. n., deformed stilettos: a – paratype No. 14, b – paratype No. 3, c – paratype No. 6, D – paratype No. 12, E – paratype No. 4, F – paratype No. 5, G – paratype No. 13. Scale 100 microns.

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9. Fig 8. Opisthocystis strictostylus Krivorotkin et Timoshkin sp. n., stilettos: A – holotype, B – paratype No. 1, c – paratype No. 2, D – paratype No. 7, E – paratype No. 8, f – paratype No. 9. Scale 100 microns.

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10. Fig 9. Opisthocystis sekeri Krivorotkin et Timoshkin sp. n., holotype: A – arrangement of organs; B, C – stylet; D–F – distal tip of the stylet. Scale, microns: A – 400; B – 65; C – 100; D–F – 10.

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11. Fig 10. Opisthocystis tenuistylus Krivorotkin et Timoshkin sp. n., organ layout (A), stilettos (B–E) and their distal ends (F, G): A, B, D, F is the holotype; C, E, G is the paratype. Scale, microns: A – 400; B, C – 200; D, E – 100; F, G – 10.

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12. Fig 11. Opisthocystis multifidus (Nasonov, 1935), organ layout (A), stilettos (B–F) and their distal ends (G, H): A – specimen No. 13; B – specimen No. 1; C – specimen No. 2; D – specimen No. 3; E, H – individual No. 7; F, G – individual No. 8. Scale, microns: A – 400; B–F – 100; G, H – 20.

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13. Fig 12. Opisthocystis multifidus (Nasonov, 1935), stilettos: A – specimen No. 4, B – specimen No. 5, C – specimen No. 6, D – specimen No. 9, E – specimen No. 10, F – specimen No. 11, G – specimen No. 12. The scale is 100 microns.

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14. Fig 13. Opisthocystis multifidus (Nasonov, 1935), stilettos: A – specimen No. 1, B – specimen No. 3, C – specimen No. 4, D – specimen No. 9. Scale 50 microns.

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15. Fig 14. Opisthocystis multifidus (Nasonov, 1935), distal section of stilettos (A–C, E–H) and microstructural features of the cocoon surface (D): A – specimen No. 3, B, C – specimen No. 5, D – specimen No. 13, E, F – specimen No. 9, G, H – individual No. 7; on A, B, E–H, the arrows show the processes, on C– the arrow shows the outlet located at the base of the processes. The scale is 20 microns.

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16. Fig 15. Opisthocystis octopropagostylus Lukhnev et Timoshkin, 2014, stilettos (A–I) and their distal ends (J, K): A – specimen No. 1, B – specimen No. 2, C – specimen No. 3, D – specimen No. 4, E – specimen No. 5, F – individual No. 6, G – individual No. 8, H – individual No. 9, I – individual No. 11, J – individual No. 7, K – individual No. 10. The scale is 100 microns.

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17. Fig 16. Opisthocystis cf. umylinae Timoshkin, 2010, stilettos (A–J) and their distal ends (K–O): A, K – specimen No. 1; B, L – specimen No. 2; C, M – specimen No. 3; D – specimen No. 4; E, N – individual No. 5; F – individual No. 6; G – individual No. 7; H, O – individual No. 8; I – individual No. 9; J – individual No. 10. Scale, microns: A–J – 100; K–O – 20.

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18. Fig 17. Opisthocystis cf. umylinae Timoshkin, 2010, stilettos (A–C, E, F) and granular vesicle (D): A – specimen No. 1; B – specimen No. 2; C, D – specimen No. 5; E – specimen No. 8; F – specimen No. 10. The scale is 50 microns.

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19. Fig 18. Opisthocystis cf. umylinae Timoshkin, 2010, distal end of stilettos (A–F) and cocoon surface structure (G, H): A – specimen No. 1; B – specimen No. 2; C – specimen No. 5; D, E – specimen No. 8; F – specimen No. 10; G, H – individual No. 6. Scale 20 microns.

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20. Fig 19. Distal ends of the stilettos of Opisthocystis bilobatus nasonov, 1935 (a), Opisthocystis multifidus (Nasonov, 1935) (B), Opisthocystis irregularis nasonov, 1935 (c), Opisthocystis campanulatus nasonov, 1935 (D), according to: nasonov, 1935. There is no scale in the original.

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