The spring-dwelling amphipod genus Lyurella (Peracarida, Amphipoda): systematics, distribution, and affinity, with description of the second representative from the Black Sea coast region

in Crustaceana
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The hitherto monotypic, crangonyctid genus Lyurella Derzhavin, 1939, despite belonging to one of the most diverse and widely distributed amphipod families in the fresh waters of the Holarctic, is poorly studied due to its rarity and its limited distribution in the Caucasian region. Until now, it has been solely represented by its type species, Lyurella hyrcana Derzhavin, 1939 from the Lankaran lowlands of Azerbaijan and from Lahidjan in northern Iran. In this paper, a new species, Lyurella shepsiensis, is described from a spring in the Shepsi River basin in the Tuapse District of Russia. This is the first representative of this genus from Russia. The new species is closely similar to L. hyrcana, differing mainly in the morphology of the gnathopods and pereopods. This latter species is also redescribed herein, based on new collections that extend its known geographic range.

The spring-dwelling amphipod genus Lyurella (Peracarida, Amphipoda): systematics, distribution, and affinity, with description of the second representative from the Black Sea coast region

in Crustaceana

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References

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Figures

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    Map showing the positions of sampling sites and distribution of Lyurella species in the Transcaucasian region. Inset shows L. shepsiensis sp. nov. (photo by D. A. Sidorov). Red-black dots represent 1-3 closely proximate localities. This figure is published in colour in the online edition of this journal, which can be accessed via http://booksandjournals.brillonline.com/content/journals/15685403.

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    Lyurella shepsiensis sp. nov., female, 6.25 mm, holotype (X41776/Cr-1501-FENU): A, Gnathopod I. A′, Enlarged propodus of gnathopod I. A″, Palmar margin of gnathopod I propodus. B, Gnathopod II. B′, Enlarged propodus of gnathopod II. B″, Palmar margin of gnathopod II propodus. Scale bars = 0.2 mm.

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    Lyurella shepsiensis sp. nov., female, 6.25 mm, holotype (X41776/Cr-1501-FENU): A, Uropod I. B, Uropod II. C, Uropod III. D, Telson. E, Lower lip. F, Upper lip. G, Pleopod I. G′, Coupling setae (retinacula). H, Pleopod II. I, Pleopod III. J, Epimera I-III. Female, 6.0 mm, paratype (X41777/Cr-1502-FENU): K, Uropod III. Male, 5.3 mm, paratype (X41777/Cr-1502-FENU): L, Uropod III. M, Uropod III. N, Telson. Scale bars = 0.2 mm.

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    Lyurella shepsiensis sp. nov., female, 6.25 mm, holotype (X41776/Cr-1501-FENU): A, Antenna I. B, Antenna II. D, Mandible, left. E, Mandible, right. E′, Lacinia mobilis. F, Maxilla I. F′, Enlarged maxilla I, outer plate. G, Maxilla II. G′, Enlarged pectinate seta on maxilla II, outer plate. H, Maxilliped. H′, Enlarged maxilliped, outer plate. H″, Enlarged maxilliped, inner plate. Male, 5.3 mm, paratype (X41777/Cr-1502-FENU): C, Antenna II. Scale bars = 0.2 mm.

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    Lyurella shepsiensis sp. nov., female, 6.25 mm, holotype (X41776/Cr-1501-FENU): A, Pereopod III. A′, Enlarged pereopod III, dactylus. B, Pereopod IV. B′, Enlarged pereopod IV, dactylus. C, Pereopod V. C′, Enlarged pereopod V, dactylus. D, Pereopod VI. D′, Enlarged pereopod VI, dactylus. E, Pereopod VII. E′, Enlarged pereopod VII, dactylus. Scale bars = 0.2 mm.

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    Lyurella shepsiensis sp. nov., male, 5.3 mm, paratype (X41777/Cr-1502-FENU): A, Gnathopod I. A′, Palmar margin of gnathopod I propodus. B, Gnathopod II. B′, Palmar margin of gnathopod II propodus. Scale bars = 0.2 mm.

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    Lyurella hyrcana Derzhavin, 1939, female, 6.2 mm (X41778/Cr-1503-FENU): A, Gnathopod I. A′, Palmar margin of gnathopod I propodus. B, Gnathopod II. B′, Palmar margin of gnathopod II propodus. Scale bars = 0.2 mm.

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    Lyurella hyrcana Derzhavin, 1939, female, 6.2 mm (X41778/Cr-1503-FENU): A, Antenna II. B, Antenna I. C, Epimera I-III. D, Uropod I. E, Uropod II. F, Uropod III. G, Telson. Male, 5.0 mm: H, Antenna II. I, Uropod I. I′, Enlarged uropod I, distal process. J, Uropod II. K, Uropod III. L, Telson. Scale bars = 0.2 mm.

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    Lyurella hyrcana Derzhavin, 1939, female, 6.2 mm (X41778/Cr-1503-FENU): A, Mandible, left. B, Mandible, right. B′, Lacinia mobilis. C, Lower lip. D, Maxilla I. D′, Enlarged maxilla I, outer plate. E, Maxilla II. F, Upper lip. G, Maxilliped. G′, Enlarged maxilliped, outer plate. G″, Enlarged maxilliped, inner plate. Scale bars = 0.2 mm.

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    Lyurella hyrcana Derzhavin, 1939, female, 6.2 mm (X41778/Cr-1503-FENU): A, Pleopod I. A′, Coupling setae (retinacula). B, Pleopod II. C, Pleopod III. C′, Enlarged bifid plumose seta. D, Pereopod III. D′, Enlarged pereopod III, dactylus. E, Pereopod IV. E′, Enlarged pereopod IV, dactylus. F, Pereopod V. F′, Enlarged pereopod V, dactylus. G, Pereopod VI. G′, Enlarged pereopod VI, dactylus. H, Pereopod VII. H′, Enlarged pereopod VII, dactylus. Scale bars = 0.2 mm.

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    Lyurella hyrcana Derzhavin, 1939, male, 5.0 mm (X41778/Cr-1503-FENU): A, Gnathopod I. A′, Palmar margin of gnathopod I propodus. B, Gnathopod II. B′, Palmar margin of gnathopod II propodus. B″, Carpus of gnathopod I. Scale bars = 0.2 mm.

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    Scanning electron micrographs of right mandibles of: A, Lyurella shepsiensis sp. nov.; B, Lyurella hyrcana Derzhavin, 1939.

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