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8 results for “Paramysis”
Data from: Migration and isolation during the turbulent Ponto-Caspian Pleistocene create high diversity in the crustacean Paramysis lacustris
The Ponto-Caspian brackish-water fauna inhabits estuaries and rivers of the Black, Azov and Caspian seas and is fragmented by higher salinity waters and a major interbasin watershed. The fauna is known for the high levels of endemism, complex zoogeographic histories, and as a recent source of successful invasive species. It remains debated whether the Black and Azov Sea brackish-water populations survived unfavourable Pleistocene conditions in multiple separate refugia or whether the two seas were (repeatedly) recolonized from the Caspian. Using microsatellite and mtDNA markers, we demonstrate deep among- and within-basin subdivisions in a widespread Ponto-Caspian mysid crustacean Paramysis lacustris. Five genetic clusters were identified, but their relationships did not reflect the geography of the region. The Azov cluster was the most distinct (4–5% COI divergence), despite its geographic position in the corridor between Black and Caspian seas, and may represent a new species. In the northern Black Sea area, the Dnieper cluster was closer to the Caspian cluster than to the neighbouring Danube–Dniester–Bug populations, suggesting separate colonizations of the Black Sea. Overall, the data implied a predominant gene flow from the east to the Black Sea and highlight the importance of Caspian Sea transgressions in facilitating dispersal. Yet, the presence of distinct lineages in the Black Sea points to the persistence of isolated refugial populations that have gained diagnostic differences under presumably high mutation rates and large population sizes. The unfavourable Pleistocene periods in the Black Sea therefore appear to have promoted diversification of the brackish-water lineages, rather than extirpated them.
FIGURE 5. Paramysis baeri Czerniavsky, 1882 in Diversity within the Ponto-Caspian Paramysis baeri Czerniavsky sensu lato revisited: P. bakuensis G. O. Sars restored (Crustacea: Mysida: Mysidae)
FIGURE 5. Paramysis baeri Czerniavsky, 1882: (a–c) ♂, Dagestan; (a) head; (b) penis, medial view; (c) pleopod IV, dorsal view; (d) lectotype, subadult ♂, endopod of uropod (without setae and statocyst), ventral view. Scales: (a) 1 mm, (b), (c), (d) 0.5 mm.
FIGURE 7. Paramysis bakuensis G.O. Sars, 1895 in Diversity within the Ponto-Caspian Paramysis baeri Czerniavsky sensu lato revisited: P. bakuensis G. O. Sars restored (Crustacea: Mysida: Mysidae)
FIGURE 7. Paramysis bakuensis G.O. Sars, 1895: (a, c) lectotype, subadult Ψ; (b, d–g) Ψ, Volga delta; (a) telson (terminal spine-setae missing); (b) telson, distal part; (c) antennal scale, dorsal view; (d) exopod of maxilla II, caudal view; (e) pereiopod I, frontal view; (f) pereiopod VI, frontal view; (g) dactylus of pereiopod VI, frontal view. Scales: (a) 1 mm, (b), (c), (e), (f), (g) 0.5 mm, (d) 0.25 mm.
FIGURE 6. Paramysis bakuensis G.O. Sars, 1895 in Diversity within the Ponto-Caspian Paramysis baeri Czerniavsky sensu lato revisited: P. bakuensis G. O. Sars restored (Crustacea: Mysida: Mysidae)
FIGURE 6. Paramysis bakuensis G.O. Sars, 1895: (a, c–e) lectotype, subadult Ψ; (b) Ψ, Volga delta, head; (a) total view; (c) maxillipede I, frontal view; (d) maxillipede II, frontal view; (e) pereiopod I (setae and dactylus missing), frontal view. Scales: (a), (b) 1 mm, (c), (d), (e) 0.25 mm.
FIGURE 3. Paramysis baeri Czerniavsky, 1882 in Diversity within the Ponto-Caspian Paramysis baeri Czerniavsky sensu lato revisited: P. bakuensis G. O. Sars restored (Crustacea: Mysida: Mysidae)
FIGURE 3. Paramysis baeri Czerniavsky, 1882, lectotype, subadult ♂: (a) mandibular palp, medial view; (b) maxilla I, frontal view; (c) maxillipede I, frontal view; (d) maxillipede II, frontal view. Scales 0.5 mm.
FIGURE 4. Paramysis baeri Czerniavsky, 1882 in Diversity within the Ponto-Caspian Paramysis baeri Czerniavsky sensu lato revisited: P. bakuensis G. O. Sars restored (Crustacea: Mysida: Mysidae)
FIGURE 4. Paramysis baeri Czerniavsky, 1882, lectotype, subadult ♂: (a) telson; (b) antennal scale (without setae); (c) maxilla II, frontal view; (d) pereiopod I, frontal view; (e) pereiopod VI, frontal view; (f) dactylus of pereiopod VI, frontal view. Scales: (a), (b), (c), (d), (e) 0.5 mm, (f) 0.25 mm.
Data from: Migration and isolation during the turbulent Ponto-Caspian Pleistocene create high diversity in the crustacean Paramysis lacustris
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FIGURE 2. Paramysis baeri Czerniavsky, 1882 in Diversity within the Ponto-Caspian Paramysis baeri Czerniavsky sensu lato revisited: P. bakuensis G. O. Sars restored (Crustacea: Mysida: Mysidae)
FIGURE 2. Paramysis baeri Czerniavsky, 1882, lectotype, subadult ♂. Scale 1 mm.
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