Moraria (Baikalomoraria) okunevae sp. n. and Moraria (Baikalomoraria) ornofurcata sp. n. (Copepoda, Harpacticoida, Canthocamptidae) from Lake Baikal

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Abstract

During the study of coastal harpacticoid communities of Lake Baikal, representatives of two new species were discovered: Moraria (Baikalomoraria) okunevae sp. n. and Moraria (Baikalomoraria) ornofurcata sp. n. Morphologically, both new species are similar to Moraria (Baikalomoraria) spinulosa Borutzky et Okuneva 1972, but differ well in the structure of the caudal rami. The morphology of these species was studied using scanning electron microscopy. An illustrated description is provided, and variability characterized.

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About the authors

T. M. Alekseeva

Limnological Institute, Russian Academy of Sciences

Author for correspondence.
Email: atm171@mail.ru
Russian Federation, Irkutsk, 664033

References

  1. Алексеева Т. М., Шевелева Н. Г., Тимошкин О. А., 2023. Переописание Moraria (Baikalomoraria) longicauda Borutzky, 1952 (Copepoda, Harpacticoida, Canthocamptidae) из озера Байкал // Зоологический журнал. Т. 102. № 7. С. 751–766.
  2. Алексеева Т. М., Тимошкин О. А., 2023. Переописание Moraria (Baikalomoraria) werestschagini Borutzky 1949 (Copepoda, Harpacticoida, Canthocamptidae) из озера Байкал // Зоологический журнал. Т. 102. № 9. С. 1000–1020.
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  4. Боруцкий Е. В., 1949. Материалы по фауне Copepoda – Harpacticoida из озера Байкал. Род Moraria // Доклады Академии Наук СССР. Т. 64. № 6. 873–876.
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2. Fig. 1. Moraria (Baikalomoraria) okunevae sp. n. (A) and Moraria (Baikalomoraria) ornofurcata sp. n. (B), SEM photographs of the external appearance of females, lateral view. Scale bar 300 µm.

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3. Fig. 2. Moraria (Baikalomoraria) okunevae sp. n., female, external view: A – dorsal, B – lateral. Scale bar 200 µm.

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4. Fig. 3. Moraria (Baikalomoraria) okunevae sp. n., female: A – abdomen with P5-bearing somite, dorsal; B – abdomen with P5-bearing somite, lateral; C – abdomen, ventral; D – P5-bearing somite, ventral. Scale bar 200 µm.

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5. Fig. 4. Moraria (Baikalomoraria) okunevae sp. n., SEM photographs of the caudal branches of females: A – ventral; B, C – lateral. Scale bar 50 µm.

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6. Fig. 5. Moraria (Baikalomoraria) okunevae sp. n., female: A – antennula and rostrum, dorsal; B – antenna, frontal. Scale bar 100 µm.

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7. Fig. 6. Moraria (Baikalomoraria) okunevae sp. n., female: A – lambrum, external side; B – lambrum, internal side; C – mandible, frontal; D – maxillula, frontal; E – maxilla, frontal; F – maxilliped, caudal. Scale bar 100 µm.

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8. Fig. 7. Moraria (Baikalomoraria) okunevae sp. n., female: A – P1, anterior side; B – P2, anterior side; C – P3, anterior side; D – P4, anterior side. Scale bar 100 µm.

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9. Fig. 8. Moraria (Baikalomoraria) okunevae sp. n. (A, B) and Moraria (Baikalomoraria) ornofurcata sp. n. (C), females: A, C – P5, anterior side; B – genital area. Scale, µm: A, C – 100, B – 50.

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10. Fig. 9. Moraria (Baikalomoraria) okunevae sp., caudal branches of paratypes No. 1 (A, B) and No. 2 (C, D): A, C – dorsal; B, D – lateral. Scale bar 50 µm.

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11. Fig. 10. Moraria (Baikalomoraria) ornofurcata sp. n., female, external view: A – dorsal, B – lateral. Scale bar 200 µm.

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12. Fig. 11. Moraria (Baikalomoraria) ornofurcata sp. n., female: A – abdomen with P5-bearing somite, dorsal; B – abdomen with P5-bearing somite, lateral; C – abdomen, ventral; D – P5-bearing somite, ventral. Scale bar 200 µm.

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13. Fig. 12. Moraria (Baikalomoraria) ornofurcata sp. n., SEM photographs of the caudal branches of the female: A – dorsal; B – ventral; C, D – lateral. Scale bar 50 µm.

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14. Fig. 13. Moraria (Baikalomoraria) ornofurcata sp. n., caudal branches of females dorsally (A, C, E, G) and ventrally (B, D, F, H): A, B – paratype #1; C, D – paratype #2; E, F – paratype #3; G, H – paratype #5. Scale bar 100 µm.

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15. Fig. 14. Moraria (Baikalomoraria) okunevae sp. n. (A) and Moraria (Baikalomoraria) ornofurcata sp. n. (B), caudal branches of females, lateral view. Scale bar 50 µm.

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16. Fig. 15. Moraria (Baikalomoraria) okunevae sp. n., diagram of the variability of some limbs of females of the type series.

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17. Fig. 16. Moraria (Baikalomoraria) ornofurcata sp. n., diagram of the variability of some limbs of females of the type series.

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