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120 results for “Fagales”
FIGURE 2 in Tenuipalpidae (Acari: Trombidiformes) from Casuarinaceae (Fagales)
FIGURE 2. Chaudhripalpus creelae (Smiley, Frost and Gerson), adult female, anterior margin of prodorsum, a. dorsal view indicating position of gnathosoma, setae v2 inserted under anterior fold; b. dorsal view with detail of palps and gnathosoma partially exposed, setae v2 inserted under anterior fold; c. ventral view with details of palps.
FIGURE 4 in Tenuipalpidae (Acari: Trombidiformes) from Casuarinaceae (Fagales)
FIGURE 4. Chaudhripalpus creelae (Smiley, Frost and Gerson), adult female, legs (left side), eupathidia (pζ′-pζ′′) not labelled on leg I.
FIGURE 41 in Tenuipalpidae (Acari: Trombidiformes) from Casuarinaceae (Fagales)
FIGURE 41. Magdalenapalpus strandtmanni (Smiley, Frost and Gerson), larva, a. dorsum; b. leg I; c. leg III.
FIGURE 43 in Tenuipalpidae (Acari: Trombidiformes) from Casuarinaceae (Fagales)
FIGURE 43. Magdalenapalpus caperatus Beard and Seeman, adult female, anterior margin of prodorsum, with details of palp.
FIGURE 36 in Tenuipalpidae (Acari: Trombidiformes) from Casuarinaceae (Fagales)
FIGURE 36. Crossipalpus raveni Beard and Seeman, adult male, a. posterior venter, with genital opening retracted; b. aedeagus.
FIGURE 26 in Tenuipalpidae (Acari: Trombidiformes) from Casuarinaceae (Fagales)
FIGURE 26. Crossipalpus gersoni Beard and Seeman, adult female, ventral view of anterior margin of prodorsum, with detail of palps.
FIGURE 40 in Tenuipalpidae (Acari: Trombidiformes) from Casuarinaceae (Fagales)
FIGURE 40. Magdalenapalpus strandtmanni (Smiley, Frost and Gerson), adult female, legs (right side), solenidion ω" and eupathidia (pζ′-pζ′′) not labelled on leg I.
FIGURE 25 in Tenuipalpidae (Acari: Trombidiformes) from Casuarinaceae (Fagales)
FIGURE 25. Crossipalpus gersoni Beard and Seeman, adult female, a. dorsum; b. detail of palp; c. detail of tips of combined stylets. Scale bar for b. and c. = 25 Μm.
FIGURE 29 in Tenuipalpidae (Acari: Trombidiformes) from Casuarinaceae (Fagales)
FIGURE 29. Crossipalpus gersoni Beard and Seeman, adult male, dorsum, with details of legs and palp.
FIGURE 32 in Tenuipalpidae (Acari: Trombidiformes) from Casuarinaceae (Fagales)
FIGURE 32. Crossipalpus raveni Beard and Seeman, adult female, a. dorsum; b. detail of palp (scale bar for palp = 25 Μm).
FIGURE 28 in Tenuipalpidae (Acari: Trombidiformes) from Casuarinaceae (Fagales)
FIGURE 28. Crossipalpus gersoni Beard and Seeman, adult female, legs (right side), solenidion ω" and eupathidia (pζ′-pζ′′) not labelled on leg I.
Data from: Testing the impact of calibration on molecular divergence times using a fossil-rich group: the case of Nothofagus (Fagales)
Although temporal calibration is widely recognized as critical for obtaining accurate divergence-time estimates using molecular dating methods, few studies have evaluated the variation resulting from different calibration strategies. Depending on the information available, researchers have often used primary calibrations from the fossil record or secondary calibrations from previous molecular dating studies. In analyses of flowering plants, primary calibration data can be obtained from macro- and mesofossils (e.g., leaves, flowers, and fruits) or microfossils (e.g., pollen). Fossil data can vary substantially in accuracy and precision, presenting a difficult choice when selecting appropriate calibrations. Here, we test the impact of eight plausible calibration scenarios for Nothofagus (Nothofagaceae, Fagales), a plant genus with a particularly rich and well-studied fossil record. To do so, we reviewed the phylogenetic placement and geochronology of 38 fossil taxa of Nothofagus and other Fagales, and we identified minimum age constraints for up to 18 nodes of the phylogeny of Fagales. Molecular dating analyses were conducted for each scenario using maximum likelihood (RAxML + r8s) and Bayesian (BEAST) approaches on sequence data from six regions of the chloroplast and nuclear genomes. Using either ingroup or outgroup constraints, or both, led to similar age estimates, except near strongly influential calibration nodes. Using 'early but risky' fossil constraints in addition to 'safe but late' constraints, or using assumptions of vicariance instead of fossil constraints, led to older age estimates. In contrast, using secondary calibration points yielded drastically younger age estimates. This empirical study highlights the critical influence of calibration on molecular dating analyses. Even in a best-case situation, with many thoroughly vetted fossils available, substantial uncertainties can remain in the estimates of divergence times. For example, our estimates for the crown-group age of Nothofagus varied from 13 to 113 Ma across our full range of calibration scenarios. We suggest that increased background research should be made at all stages of the calibration process to reduce errors wherever possible, from verifying the geochronological data on the fossils to critical re-assessment of their phylogenetic position.
FIGURE 117 in Tenuipalpidae (Acari: Trombidiformes) from Casuarinaceae (Fagales)
FIGURE 117. Tegopalpus conicus Womersley, adult male from northern population, dorsum.
FIGURE 109 in Tenuipalpidae (Acari: Trombidiformes) from Casuarinaceae (Fagales)
FIGURE 109. Tegopalpus conicus Womersley, adult female, type locality, in habitat.
FIGURE 108 in Tenuipalpidae (Acari: Trombidiformes) from Casuarinaceae (Fagales)
FIGURE 108. Tegopalpus conicus Womersley, adult female from northern population, dorsum.
FIGURE 91 in Tenuipalpidae (Acari: Trombidiformes) from Casuarinaceae (Fagales)
FIGURE 91. Pentamerismus hicklingorum Seeman and Beard, adult male, dorsum.
FIGURE 85 in Tenuipalpidae (Acari: Trombidiformes) from Casuarinaceae (Fagales)
FIGURE 85. Pentamerismus wardo Seeman and Beard, adult male, dorsum with details of legs and palps.
FIGURE 67 in Tenuipalpidae (Acari: Trombidiformes) from Casuarinaceae (Fagales)
FIGURE 67. Palpipalpus hesperius Beard and Seeman, adult female, a. dorsum; b. detail of palp.
FIGURE 66 in Tenuipalpidae (Acari: Trombidiformes) from Casuarinaceae (Fagales)
FIGURE 66. Meyeraepalpus delfinadae (Smiley, Frost and Gerson), adult females in habitat.
FIGURE 64 in Tenuipalpidae (Acari: Trombidiformes) from Casuarinaceae (Fagales)
FIGURE 64. Meyeraepalpus delfinadae (Smiley, Frost and Gerson), deutonymph, dorsal opisthosoma.
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