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222 results for “ancient lake”
Ghost introgression in ricefishes of the genus Adrianichthys in an ancient Wallacean lake
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Data from: Evidence for hybridisation-driven heteroplasmy maintained across generations in a ricefish endemic to a Wallacean ancient lake
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Data from: Barcoding of ancient lake ostracods (Crustacea) reveals cryptic speciation with extremely low distances
Ostracods are drastically reduced crustaceans, with never more than eight appendages enclosed between two valves, leaving only a limited number of morphological characters for species delineation. Conservative morphology of characters used to define genera, along with high variability of characters used to define species are creating problems in applying a morphospecies concept. A high intraspecific variability in a Lake Biwa (Japan) endemic, Physocypria biwaensis (Okubo, 1990), has been observed previously but was never studied in detail. Two sympatric forms, differing in pigmentation and size, suggest a presence of reproductive isolation. The aim of this study is to employ molecular and morphometric tools to aid in species delineation within P. biwaensis complex and reconstruct their phylogenetic relationships. A fragment of the mtCOI gene was amplified from 30 specimens, and an additional 37 specimens were studied for morphological characters. Resulting phylogenies showed that each morphologically distinct form is associated with a distinct phylogenetic group based on mtDNA. The average pairwise distance is very low (5%), indicating a recent divergence time. I speculate that there is a possibility that one of them originated in the lake, while the other probably colonized it afterwards. This seems to be supported with an apparent niche partitioning at different depths. In spite of the fact that traditionally used sexual characters are highly variable in these two species, the morphometric analysis of shell and soft part related characters clearly delineates them and suggests that such characters may be useful for future detection of seemingly cryptic ostracod species.
FIGURE 1 in The ancient Balkan lakes harbor a new endemic species of Diaphanosoma Fischer, 1850 (Crustacea: Branchiopoda: Cladocera)
FIGURE 1. Diaphanosoma macedonicum sp. nov., female, Lake Dojran, Macedonia. A, general lateral view. B, general dorsal view. C, antennule. D, basipodital distal outer end. E, distal part of proximal segment of upper antennal branch of two individuals. F, apical end of distal segment of upper antennal branch. G, distal part of lower antennal branch. H, proximal part of lower antennal branch, inner side. I, resting eggs in brood pouch of gamogenetic female. J, dorsal seta of proximal part of antennal basipodite. K, dorsal seta of distal part of antennal basipodite.
FIGURE 4 in The ancient Balkan lakes harbor a new endemic species of Diaphanosoma Fischer, 1850 (Crustacea: Branchiopoda: Cladocera)
FIGURE 4. Diaphanosoma macedonicum sp. nov., male, Lake Dojran, Macedonia. A, general lateral view. B, head, ventral view. C, setules of distal part of antennule. D, apical end of antennal basipodite, outer side. E, copulatory appendages. F, distal part of thoracic limb of first pair (tl I). G, hook on apical end of tl I.
FIGURE 3 in The ancient Balkan lakes harbor a new endemic species of Diaphanosoma Fischer, 1850 (Crustacea: Branchiopoda: Cladocera)
FIGURE 3. Diaphanosoma macedonicum sp. nov., female, Lake Dojran, Macedonia. A, distal part of endopodite of thoracic limb of first pair (tl I). B, apical end of exopodite of tl I. C, gnathobases of tl I. D, thoracic limb of second pair (tl II). E, setae on distal corner of gnathobases of thoracic limb of third pair (tl III). F, thoracic limb of sixth pair (tl VI).
FIGURE 2 in The ancient Balkan lakes harbor a new endemic species of Diaphanosoma Fischer, 1850 (Crustacea: Branchiopoda: Cladocera)
FIGURE 2. Diaphanosoma macedonicum sp. nov., female (A–D, I – Lake Prespa, E–H, J–L – Lake Dojran) A–C, head, lateral view. D, E, posterior part of shell. F–I, armament of ventroposterior valve margin. J, ventral valve inflection. K, postabdomen, lateral view. L, postabdominal claw.
FIGURE 2A–F. A –D in A new species of the water mite genus Hygrobates Koch, 1837 (Acari: Hydrachnidia: Hygrobatidae) from the ancient Lake Ohrid
FIGURE 2A–F. A –D Hygrobates quanaticola Schwoerbel & Sepasgozarian, 1976 (A, C = male holotype, B, D = female paratype): A–B = coxal field; C–D = photographs of the genital field. E–F H. diversiporus Sokolow, 1927 (E = male, F = female): genital field (from Sokolow 1927). Scale bar = 100 µm.
FIGURE 1A–E. Hygrobates zawali n in A new species of the water mite genus Hygrobates Koch, 1837 (Acari: Hydrachnidia: Hygrobatidae) from the ancient Lake Ohrid
FIGURE 1A–E. Hygrobates zawali n. sp. (A, C = male holotype, B, D–E = female paratypes): A–B = coxal field; C–E = genital field. Scale bar = 100 µm.
FIGURE 3A–F. A –D. Hygrobates zawali n in A new species of the water mite genus Hygrobates Koch, 1837 (Acari: Hydrachnidia: Hygrobatidae) from the ancient Lake Ohrid
FIGURE 3A–F. A –D. Hygrobates zawali n. sp. (A, B = male holotype, C–D = female paratype): palp. E–F H. quanaticola Schwoerbel & Sepasgozarian, 1976 (E = male holotype, F = female [slide J/14]): palp (from Schwoerbel & Sepasgozarian 1976). Scale bar = 100 µm.
Figure 28 in Systematic revision of the freshwater snail Margarya Nevill, 1877 (Mollusca: Viviparidae) endemic to the ancient lakes of Yunnan, China, with description of new taxa
Figure 28. Distribution of three genera and stratigraphic region of Yunnan (adapted from Yunnan Bureau of Geology and Mineral Resources, 1990): I1, Tengchong –Baoshan subregion of Yunnan–Tibet region; II1, Zhongdian subregion of Tethys region; II2, Lanping–Simao subregion of Tethys region; III1, Central Yunnan subregion of Yangtze region; IV1, Southeast Yunnan subregion of South China region. Number in legend shows the species at this locality. 2* indicate two fossil species.
Figure 25 in Systematic revision of the freshwater snail Margarya Nevill, 1877 (Mollusca: Viviparidae) endemic to the ancient lakes of Yunnan, China, with description of new taxa
Figure 25. Comparison of the species of Anularya gen. nov. from four lakes with respect to parameters H and W/H.
Figure 22 in Systematic revision of the freshwater snail Margarya Nevill, 1877 (Mollusca: Viviparidae) endemic to the ancient lakes of Yunnan, China, with description of new taxa
Figure 22. Shells of Tchangmargarya multilabiata sp. nov. from Lake Changhu: A, holotype, male individual, FG594250; B, paratype, male individual, CH 1, 59.2 mm; C, paratype, female individual, CH 2, 52.8 mm; D, paratype, CH 7, 52.4 mm; E, paratype, CH 35, 50.77 mm; F, paratype, five keels variety with totally purple calcareous layers, CHX 1, 53.3 mm; G, inner lip; H, juvenile shell with band, 15.4 mm (provided by Hao Yang).
Figure 19 in Systematic revision of the freshwater snail Margarya Nevill, 1877 (Mollusca: Viviparidae) endemic to the ancient lakes of Yunnan, China, with description of new taxa
Figure 19. Shells of Tchangmargarya yangtsunghaiensis: A, Lake Yangzonghai, YZHHY 14, 50.2 mm; B, Lake Yangzonghai, YZHHY 10, 54.6 mm; C, Lake Yangzonghai, four keels variety, YZHHY 29, 48.4 mm; D, subfossil from hill of Wanfu Temple, YZHWFS 5, 49.1 mm; E, holotype of Margarya yangtsunghaiensis, FG00001.
Figure 17. A–C in Systematic revision of the freshwater snail Margarya Nevill, 1877 (Mollusca: Viviparidae) endemic to the ancient lakes of Yunnan, China, with description of new taxa
Figure 17. A–C, recent shells of Margarya monodi: A, Lake Dianchi, DCXHJ 1, 61.2 mm; B, Lake Dianchi, DCHK 1, 57.4 mm; C, Lake Dianchi, IZCAS FG89681, 50.0 mm; D, subfossil specimens, Haikou, Lake Dianchi (left to right: 60.6 mm, 67.3 mm, 61.5 mm, 65.1 mm); E, submature shell, DCHK 40, 38.2 mm; F, juvenile shell, 14.3 mm, taken from DCHK 1; G, holotype of Margarya elongata, FG00074; H, holotype of Margarya elongata var. yini, FG00096; I, holotype of Margarya tchangsii (Xia, 1982); J, original figure of Margarya monodi (Dautzenberg & Fischer, 1905).
Figure 15 in Systematic revision of the freshwater snail Margarya Nevill, 1877 (Mollusca: Viviparidae) endemic to the ancient lakes of Yunnan, China, with description of new taxa
Figure 15. Shells of Margarya oxytropoides: A, Lake Dianchi, DCXHJ 2, 65.9 mm; B, Lake Dianchi, DCXHJ 44, 53.1 mm; C, Lake Dianchi, DCXHJ 3, 54.1 mm; D, Lake Dianchi, DCHK 41, 62.1 mm; E, Lake Lugu (provided by Liu Ye); F, Lake Dianchi, FG68944, 41.0 mm; G, original figure of Paludina oxytropoides (Heude, 1889); H, juvenile shell, 14.2 mm.
Figure 14 in Systematic revision of the freshwater snail Margarya Nevill, 1877 (Mollusca: Viviparidae) endemic to the ancient lakes of Yunnan, China, with description of new taxa
Figure 14. Scanning electron micrograph showing radula of Margarya francheti from Lake Dianchi: A, central tooth; B, lateral tooth; C, inner marginal tooth; D, outer marginal tooth.
Figure 13 in Systematic revision of the freshwater snail Margarya Nevill, 1877 (Mollusca: Viviparidae) endemic to the ancient lakes of Yunnan, China, with description of new taxa
Figure 13. Shells of Margarya francheti: A, Lake Jianhu, JHFS 1, 86.9 mm; B, Lake Erhai, EHCC 11, 45.1 mm; C, Lake Dianchi, DCWLB 1, 58.3 mm; C, D, Lake Erhai, FG89708, 60.1 mm; E, holotype figure of Margarya francheti; F, holotype figure of Margarya tropidophora (E, F, from Mabille, 1886).
Figure 12 in Systematic revision of the freshwater snail Margarya Nevill, 1877 (Mollusca: Viviparidae) endemic to the ancient lakes of Yunnan, China, with description of new taxa
Figure 12. Mature juvenile shell of Margarya species: A, Margarya melanioides, JH 13, Lake Jianhu; B, Margarya francheti, EHCC 12, Lake Erhai; C, Margarya monodi, IZCAS FG89681, Lake Dianchi; D, Margarya oxytropoides, DCXHJ 44, Lake Dianchi.
Figure 11 in Systematic revision of the freshwater snail Margarya Nevill, 1877 (Mollusca: Viviparidae) endemic to the ancient lakes of Yunnan, China, with description of new taxa
Figure 11. Scanning electron micrographs of the radula of Margarya melanioides, Lake Jianhu: A, central tooth; B, lateral tooth; C, inner marginal tooth; D, outer marginal tooth.
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
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