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993 results for “T Dwarfs”
FIGURE 6 in An Unusual, Dwarf New Species Of Neotropical Freshwater Stingray, Plesiotrygon Nana Sp. Nov., From The Upper And Mid Amazon Basin: The Second Species Of Plesiotrygon (Chondrichthyes: Potamotrygonidae)
FIGURE 6: Paratype of Plesiotrygon nana sp. nov., in dorsal (A) and ventral (B) views (MZUSP 108777, juvenile female, 463 mm TL, 81 mm DL, 72 mm DW, Río Itaya, tributary of Río Nanay, near Iquitos, Peru).
FIGURE 9 in An Unusual, Dwarf New Species Of Neotropical Freshwater Stingray, Plesiotrygon Nana Sp. Nov., From The Upper And Mid Amazon Basin: The Second Species Of Plesiotrygon (Chondrichthyes: Potamotrygonidae)
FIGURE 9: Dorsal (A, B) and external (C) aspect of clasper of holotype of Plesiotrygon nana sp. nov. (MUSM 20328, adult male, 243 mm DL, 247 mm DW). Abbreviations: CG, clasper groove; DPS, dorsal pseudosiphon; VPS, ventral pseudosiphon (mostly concealed in dorsal view). Scale bar = 1 cm.
FIGURE 5 in An Unusual, Dwarf New Species Of Neotropical Freshwater Stingray, Plesiotrygon Nana Sp. Nov., From The Upper And Mid Amazon Basin: The Second Species Of Plesiotrygon (Chondrichthyes: Potamotrygonidae)
FIGURE 5: Paratype of Plesiotrygon nana sp. nov., in dorsal (A) and ventral (B) views, shortly after capture (MZUSP 108777, juvenile female, 463 mm TL, 81 mm DL, 72 mm DW, Río Itaya, tributary of Río Nanay, near Iquitos, Peru). Image courtesy of F. Marques.
FIGURE 7 in An Unusual, Dwarf New Species Of Neotropical Freshwater Stingray, Plesiotrygon Nana Sp. Nov., From The Upper And Mid Amazon Basin: The Second Species Of Plesiotrygon (Chondrichthyes: Potamotrygonidae)
FIGURE 7: Dorsal (A) and ventral (B) discs of paratype of Plesiotrygon nana sp. nov. (MZUSP 108777, juvenile female, 463 mm TL, 81 mm DL, 72 mm DW, Río Itaya, tributary of Río Nanay, near Iquitos, Peru).
Best-fit Abundances, Observed Spectra and Spectral Models for the New Sample of Ultracool Dwarf Benchmarks with Detailed Chemical Characterization
<p>Dataset associated with Fisher et al. 2024 in RNAAS <a href="https://iopscience.iop.org/article/10.3847/2515-5172/ad79f0">[link to publication]</a></p> <p><code>summary.mrt</code> is a table of identifiers, photometry, fundamental stellar parameters and detailed chemical compositions for 13 candidate wide binary systems with FGK Main Sequence primaries (5100 K < Teff < 6300 K) and ultracool dwarf companions (2500 K < Teff < 3100 K). Refer to the file header for detailed description of columns and units.</p> <p><code>stars.zip</code> contains the high-resolution spectra of primaries observed with the Automated Planet Finder (APF, program <code>2021B_A010</code>), as well as the corresponding best-fit spectral models. Each FITS file in the archive represents an individual exposure of the primary. The files are arranged in directories by identifiers of the primaries. The total number of exposures varies from source to source.</p> <p>FITS files are composed of a primary HDU and 6 extensions.</p> <ul> <li>The primary HDU contains the unmodified sky-subtracted spectrum of the object as produced by the APF pipeline and published on <a href="https://jump.caltech.edu/">Jump</a>. The spectrum is stored as a 2D array organized by Echelle orders.</li> <li>The first extension contains the corresponding air wavelengths [in A] transformed to the rest frame of the source.</li> <li>The second extension is the boolean mask of pixels included in model fitting.</li> <li>The third extension is the adopted statistical weights of each pixel, estimated as inverse variances under the assumption of Poisson noise.</li> <li>The fourth extension contains the best-fit synthetic spectrum in CGS units of surface intensity per wavelength in A.</li> <li>The fifth extension is the best-fit spline continuum correction between the model and the data.</li> <li>The final extension contains the adopted FWHM of the line spread function in each pixel, estimated by combining in quadrature a wavelength-dependent component with λ/Δλ=120,000 and a best-fit wavelength independent component (the <code>quickblur</code> parameter of the <a href="https://github.com/Roman-UCSD/chemfit">chemfit</a> package)</li> </ul> <p>This repository is for the research note "New Sample of Ultracool Dwarf Benchmarks with Detailed Chemical Characterization" by Fisher et al. It is associated with manuscript number AAS58102.</p>
FIGURE 3. Homalolepis pumila. A in Two new dwarf species of Homalolepis (Simaroubaceae) from the Brazilian Cerrado (Neotropical savanna)
FIGURE 3. Homalolepis pumila. A. Habit, the inflorescence at ground level. B. Individual bearing only flowers, before leaf sprouting. C. Flower. D. Stamen bearing a laminar appendage. E. Distal portion of the style showing the stigma lobed. F. Two fruits, one with four drupelets, the other with only one (A–H. Devecchi & Alves 323).
FIGURE 2. Homalolepis planaltina. A. Habit. B in Two new dwarf species of Homalolepis (Simaroubaceae) from the Brazilian Cerrado (Neotropical savanna)
FIGURE 2. Homalolepis planaltina. A. Habit. B. Apex of a leaflet showing the gland. C. Distal part of the inflorescence with floral buds and glandular bracts. D. Underground system with a young inflorescence. E. Individual with ramified underground system, the inflorescence and leaves located on different branches. F. Flowers with five and six petals on a same inflorescence. G. Individual in reproductive stage, without leaves.
FIGURE 1. Homalolepis planaltina. A. Habit, vegetative stage. B. Stem thickened with underground development. C in Two new dwarf species of Homalolepis (Simaroubaceae) from the Brazilian Cerrado (Neotropical savanna)
FIGURE 1. Homalolepis planaltina. A. Habit, vegetative stage. B. Stem thickened with underground development. C. Portion of a leaf showing the opposite and subopposite leaflets. D. Habit, reproductive stage; the inflorescence grows near ground level. E. Flower F. and G. Stamens with anther, filament and filament appendage. H. Flower with petals removed showing the gynoecium on top of a gynophore and style (A–H. Devecchi & Bordon 320).
FIGURE 4. Homalolepis pumila A. Habit. B in Two new dwarf species of Homalolepis (Simaroubaceae) from the Brazilian Cerrado (Neotropical savanna)
FIGURE 4. Homalolepis pumila A. Habit. B. Flowers at anthesis. C. Habit, showing the underground system and inflorescence at ground level. D. Underground system with sprouting lateral inflorescences. E. An individual bearing only flowers, lateral view. F. View from above of the plant shown in E. G. Habitat of the new species: open cerrado physiognomy.
FIG. 3 in Habitat Use by the Rock-Dwelling Karoo Dwarf Tortoise, Chersobius boulengeri
FIG. 3. Mean proportions and standard deviations of home ranges (minimum convex polygons, MCP), and of GPS positions, representing specific microhabitats (A–B) or rock types (C–D), for three male (A and C) and seven female (B and D) Karoo Dwarf Tortoises (Chersobius boulengeri) in 2018–2020.
FIG. 2 in Habitat Use by the Rock-Dwelling Karoo Dwarf Tortoise, Chersobius boulengeri
FIG. 2. Proportions of the effective surface area (shaded bars) of the core of a Karoo Dwarf Tortoise (Chersobius boulengeri) study site that were characterized as slope, plateau, sill, and river bed microhabitats (A), or as dolerite and sandstone rock types (B), and proportions of the total number of unique males (black bars, n ¼ 29) and females (white bars, n ¼ 23) that were encountered in each microhabitat (A) or rock type (B) in 2018–2020.
FIG. 1 in Habitat Use by the Rock-Dwelling Karoo Dwarf Tortoise, Chersobius boulengeri
FIG. 1. Core of a Karoo Dwarf Tortoise (Chersobius boulengeri) study site in 2018–2020, with plateau, slope, sill, and river bed microhabitats. Dominant rock type at the site was dolerite, except where dots indicate sandstone. Contour lines represent equal elevations ranging from 1,373 (northeast) to 1,445 (southwest) meters above sea level. Star and diamond symbols are locations where 54 individual tortoises were encountered for the first time.
Stellar Parameter Estimation for Half a Million LAMOST M Dwarfs based on Cycle-StarNet
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Fig. 1. Frankenia fruticosa, Helme 7796 in Frankenia fruticosa (Frankeniaceae), a new dwarf shrub from the Knersvlakte, Western Cape
Fig. 1. Frankenia fruticosa, Helme 7796 (NBG). A, calyx; B, petal; C, stamen (adaxial view) and detached anther (abaxial view); D, ovary at anthesis (left) and after pollination (right). Scale: 1 mm. Artist: John Manning.
Quantitative genetics of extreme insular dwarfing: the case of red deer (Cervus elaphus) on Jersey
<p><b>Aim: </b>The Island Rule – i.e. the tendency for body size to decrease in large mammals and increase in small mammals on islands has been commonly evaluated through macroecological or macroevolutionary, pattern-orientated approaches, which generally fail to model the microevolutionary processes driving either dwarfing or gigantism. Here, we seek to identify which microevolutionary process could have driven extreme insular dwarfism in the extinct dwarf red deer population on the island of Jersey.</p> <p><b>Location:</b> Jersey, UK (Channel Islands).</p> <p><b>Taxon:</b> Red deer ( <i>Cervus elaphus</i>)</p> <p><b>Methods:</b> We applied an individual-based quantitative genetics model parameterized with red deer life-history data to study the evolution of dwarfism in Jersey's deer, considering variations in island area and isolation through time due to sea level changes.</p> <p><b>Results:</b> The body size of red deer on Jersey decreased fast early on, due to phenotypic plasticity, then kept decreasing almost linearly over time down to the actual body size of the Jersey deer (36 kg on average). Only 1% out of 10,000 replicates failed to reach that size in our simulations. The distribution of time to adaptation in these simulations was right-skewed, with a median of 395 generations (equivalent to roughly 4 ky years), with complete dwarfism effectively occurring in less than 6 ky 84.6% of times. About 72% of the variation in the time to adaptation between simulations was collectively explained by higher mutational variance, the number of immigrants from the continent after isolation, available genetic variance, heritability, and phenotypic plasticity.</p> <p><b>Main Conclusions:</b> The extreme dwarfing of red deer on Jersey is an expected outcome of high mutational variance, high immigration rate, a wide adaptive landscape, low levels of inbreeding, and high phenotypic plasticity (in the early phase of dwarfing), all occurring within a time window of around 6 ky. Our model reveals how extreme dwarfism is a plausible outcome of common, well-known evolutionary processes.</p>
FIGURE 3 in Is a dwarf population of Corythomantis greeningi Boulenger, 1896 (Anura, Hylidae) a new species?
FIGURE 3. Power spectrum (A), audiospectrogram (B) and oscillogram (C) of the advertisement call of Corythomantis greeningi.
FIGURE 1 in Is a dwarf population of Corythomantis greeningi Boulenger, 1896 (Anura, Hylidae) a new species?
FIGURE 1. (A) Adult specimen and (B) tadpole of Corythomantis greeningi photographed alive by W. Hödl.
FIGURE 2 in Is a dwarf population of Corythomantis greeningi Boulenger, 1896 (Anura, Hylidae) a new species?
FIGURE 2. Tadpole of Corythomantis greeningi (on of the lot MZUEFS 542) stage 35: (A) lateral view; (B) dorsal view; (C) ventral view (scale bar = 15 mm); (D) oral disc (scale bar = 1.0 mm).
Figure 1 in Parental care in the dwarf caiman, Paleosuchus palpebrosus Cuvier, 1807 (Reptilia: Crocodilia: Alligatoridae)
Figure 1. Locations of survey in three sites, around the Pantanal (1), in the Guaporé-Madeira (2) and Amazon Rivers (3), Brazil.
Figure 2 in Parental care in the dwarf caiman, Paleosuchus palpebrosus Cuvier, 1807 (Reptilia: Crocodilia: Alligatoridae)
Figure 2. Number of hatchlings of Paleosuchus palpebrosus counted in sites around the Pantanal, in the Guaporé-Madeira and Amazon Rivers between 2005 and 2011. Groups accompanied by an adult are indicated by triangles, and those for which an accompanying adult was not detected are shown by circular symbols.
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Allen Brain Atlas
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International Brain Laboratory public data
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OpenNeuro
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