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Fig. 7 in Morphology and histology of dorsal spines of the xenacanthid shark Orthacanthus platypternus from the Lower Permian of Texas, USA: Palaeobiological and palaeoenvironmental implications
Fig. 7. Cross-section of dorsal spine of Orthacanthus platypternus (Cope, 1884), Lower Permian, Craddock Bone Bed, Texas, USA; specimen HMNS-J7 non-denticulated region) showing color-banding in centrifugal trabecular dentine and growth lines in lamellar dentine. A. General view (posterior side of spine towards the top of the figure). B, C. Details of periphery showing pairs of growth lines (marked by arrows) in the centrifugal lamellar dentine. D. Detail of interglobular spaces within the centripetal lamellar dentine (arrows denote interglobular spaces).
Fig. 1 in Morphology and histology of dorsal spines of the xenacanthid shark Orthacanthus platypternus from the Lower Permian of Texas, USA: Palaeobiological and palaeoenvironmental implications
Fig. 1. Baylor County map (A) and stratigraphic section (B) at the Craddock Ranch (denoted with a star), Seymour Texas, lower Clear Fork Formation (cf. Nelson et al. 2013). Numbers 1–5 denote units through the sampled portion of the Craddock Ranch exposure.
Content Hosting & Services Agreement between Google Arts & Culture and The University of Texas at Austin
<p>This document was obtained through a public records request filed under the <a href="https://www.texasattorneygeneral.gov/open-government/members-public/overview-public-information-act" target="_blank" rel="noopener">Texas Public Information Act</a>. It details the terms of a collaboration between the University of Texas at Austin and the Google Cultural Institute (now Google Arts & Culture). The document was requested as part of a data collection process for my PhD dissertation at the University of Texas at Austin, which, among other topics, examined the platform's use by cultural institutions. Contracts, alongside terms of service and content guidelines, are a critical aspect of a platform’s governance mechanisms.</p> <p>The document was released in response to request <strong>R005413-103123</strong> and made available on <strong>November 17, 2023</strong>, without redactions. For this version, I redacted email addresses and other personally identifiable information.</p> <p>You can find my dissertation, which references this document, on <a href="https://zenodo.org/records/13994044" target="_blank" rel="noopener">Zenodo</a> or through the <a href="https://doi.org/10.26153/tsw/55818" target="_blank" rel="noopener">University</a>.</p>
Supporting datasets for Mexico-Texas heatwave analysis
<p>This repository contains supporting data for the manuscript titled "Contributions of Atmospheric Ridging and Low Soil Moisture to the Record-Breaking June 2023 Mexico-Texas Heatwave" by Kalashnikov et al. (2025). Please contact me with any questions at dkalashnikov@ucmerced.edu. -Dmitri</p>
Fig. 5 in Rugosuscandona, a New Genus of Candonidae (Crustacea: Ostracoda) from Groundwater Habitats in Texas, North America
Fig. 5. Rugosuscandona scharfi gen. nov. sp. nov. A, B, E: holotype male (OK-TX-AW016-008: 01), C, D: allotype female (OK-TX- AW016-008: 02). A) T2, B) T3, C) T1, D) UR with genital organ and furcal attachment, E) labium. Scale bar: 100 µm.
Fig. 4 in Rugosuscandona, a New Genus of Candonidae (Crustacea: Ostracoda) from Groundwater Habitats in Texas, North America
Fig. 4. Rugosuscandona scharfi gen. nov. sp. nov. A, B, D, E: holotype male (OK-TX-AW016-008: 01), C: allotype female (OK-TX- AW016-008: 02). A) A1, B) A2, C) A2, D) Md, E) Mxl with vibratory plate. Scale bar: 100 µm.
Fig. 3 in Rugosuscandona, a New Genus of Candonidae (Crustacea: Ostracoda) from Groundwater Habitats in Texas, North America
Fig. 3. SEM photographs of Rugosuscandona scharfi gen. nov. sp. nov. removed RV, paratype (OK-TX-AW016-008: 07) female. A) LV, interior view, B) right pair of A2, C) UR shown with thin arrow, D) sperm packs, E) close view of sperm packs. Scale bars: 100 µm for A; 10 µm for B–E. Arrows indicate forward.
Fig. 2 in Rugosuscandona, a New Genus of Candonidae (Crustacea: Ostracoda) from Groundwater Habitats in Texas, North America
Fig. 2. SEM photographs of carapace of Rugosuscandona scharfi gen. nov. sp. nov. A, C, D, H, I: paratype (OK-TX-AW016-008: 05) male. B, E, F, G, J: paratype (OK-TX-AW016-008: 06) female. A) right side view, B) dorsal view, C) posterior end of right side, D) anterior end of right side, E) dorsal view of anterior margin, F) dorsal view of posterior margin, G) pore canals on dorsal side, H) central muscle scars, I) pore canals on anterior end, J) pore canals and surface ornamentation. Scale bars: 100 µm for A, B; 10 µm for C–J. Arrows indicate forward.
Fig. 6 in Rugosuscandona, a New Genus of Candonidae (Crustacea: Ostracoda) from Groundwater Habitats in Texas, North America
Fig. 6. Rugosuscandona scharfi gen. nov. sp. nov. holotype male (OK-TX-AW016-008: 01). A) left clasping organ, B) right clasping organ, C) Zenker's organ, D) hemipenis. Scale bar: 100 µm.
Sand and gravel sediment flux data, San Antonio River, Texas
<p>Dataset consists of field observations of sand and gravel sediment fluxes and bed material in the lower San Antonio River, Texas. A Helley-Smith bedload sampler was deployed at three locations over stream discharges that span two orders of magnitude. Details are given in Haschenburger (2021), Fractional Transport Rates in a Poorly Sorted Sand-bed River, Geomorphology, 389, 107797, https://doi.org/10.1016/j.geomorph.2021.107797</p>
Hybrid evolution repeats itself across environmental contexts in Texas sunflowers (Helianthus)
<p>To what extent is evolution repeatable? Little is known about whether the evolution of hybrids is more (or less) repeatable than non-hybrids. We used field experimental evolution in annual sunflowers (<em>Helianthus</em>) in Texas to ask the extent to which hybrid evolution is repeatable across environments compared to non-hybrid controls. We created hybrids between <em>Helianthus annuus</em> (L.) and <em>H. debilis</em> (Nutt.) and grew plots of both hybrids and non-hybrid controls through eight generations at three sites in Texas. We collected seeds from each generation and grew each generation × treatment × home site combination at two final common gardens. We estimated the strength and direction of evolution in terms of fitness and 24 traits, tested for repeated versus non-repeated evolution, and assessed overall phenotypic evolution across lineages and in relation to a locally adapted phenotype. Hybrids consistently evolved higher fitness over time while controls did not, though trait evolution varied in strength across home sites. Repeated evolution was more evident in hybrids versus non-hybrid controls, and hybrid evolution was often in the direction of the locally adapted phenotype. Our findings have implications for both the nature of repeatability in evolution and the contribution of hybridization to evolution across environmental contexts.</p>
Data from: Texas field crickets (Gryllus texensis) use visual cues to place learn but perform poorly when intra- and extra-maze cues conflict
<p>Central place foraging field crickets are an ideal system for studying the adaptive value of learning and memory, but more research is needed on ecology-relevant cognition in these invertebrates. Here, we test the visuospatial place learning of Texas field crickets (<em>Gryllus texensis</em>) in a radial arm maze. Our study expands previous work on <em>G. texensis</em> cognition for accuracy measures and extends our previous findings on females to both sexes. Additionally, our study examines whether crickets use intra- or extra-maze cues to locate a food reward using a maze rotation putting the cues in conflict. We found that male and female crickets improved performance over trials when measured by accuracy variables but not latency variables; thigmotaxis negatively impacted performance in both sexes. In a reward-absent trial, both male and female crickets demonstrated place memory. When intra- and extra-maze cues conflicted during a rotation trial, crickets' performance was not better than chance. Our rotation results suggest that crickets may experience reciprocal overshadowing of conflicting cues – a result most often seen in other taxa with conflicting multi-modal cues. We conclude that crickets do not rely solely on: (1) a single-cue association; (2) route-following; or (3) their own scent cues to navigate the maze. Instead, male and female Texas field crickets seem to learn the location of the reward using a combination of proximal and distal cues. The possibility to test large numbers of wild-caught or laboratory-reared individuals opens the door to future investigations on the evolutionary ecology of visuospatial learning in these invertebrates.</p>
River gravel mobility observations, San Antonio River, Texas
<p>This data set characterizes the frequency of gravel mobility in the lower San Antonio River near Floresville, Kenedy, and Goliad, Texas. Mobility data consist of the first flow discharge when a given gravel size was mobile, the general bedload transport conditions during these mobilizing flows, the frequency of mobilizing flow during in a typical year based on flow duration analysis, and the grain size distribution of bed material. Details are given in Haschenburger (2022), Frequency of river gravel mobility, Geomorphology, 410, 108270, https://doi.org/10.1016/j.geomorph.2022.108270</p>
Data from: Homogenization of populations in the wildflower Texas bluebonnet (Lupinus texensis)
Wildflowers seeds are routinely spread along highways and thoroughfares throughout North America as part of federal beautification policy, but the genetic effect of the introduction of these cultivated populations on wild populations of the same species is unknown. Interbreeding may occur between these seeded and wild populations, resulting in several possible outcomes. Here we sample 187 individuals in 12 matched pairs of neighboring wild and seeded populations of the Texas bluebonnet (Lupinus texensis), a species popular in commercially available wildflower seed mixes used by both the Texas Department of Transportation and the public. We use genotyping by sequencing to identify 11,741 genome-wide single nucleotide polymorphisms, as well as a smaller number of SNPs from the chloroplast genome, to analyze population structure and genetic diversity within and between the populations. We find a striking lack of population structure both between wild and seeded populations and amongst wild populations. STRUCTURE analyses indicate that all populations are apparently panmictic. This pattern may be explained by extensive swamping of wild populations by seeded germplasm and increased dispersal of semi-domesticated seed across this species' core native range by humans. We discuss the possible negative and positive ramifications of homogenization on the evolutionary future of this popular wildflower species.
FIGURE 21 in Stenolaemate bryozoans from the Graham Formation, Pennsylvanian (Virgilian) at Lost Creek Lake, Texas, USA
FIGURE 21. Bryozoan diversity indices in profiles B and C (species richness, Shannon index, and Fisher's α). Diversity indices were counted using PAST version 1.81 (Hammer et al., 2001).
FIGURE 18. Septopora blanda Moore, 1929 in Stenolaemate bryozoans from the Graham Formation, Pennsylvanian (Virgilian) at Lost Creek Lake, Texas, USA
FIGURE 18. Septopora blanda Moore, 1929 (A–C): A, B – tangential section showing autozooecial apertures and chambers, and cyclozooecia (arrows) (XCI 47); C – tangential section showing autozooecial chambers and cyclozooecia (XCI 54). Penniretepora flexistriata Richards, 1959 (D–J): D–F – colony fragments with autozooecial apertures with apertural pores (arrows) and stellate structures, divided by low undulating keel (D: (XCI 121), E–F: (XCI 122); G – autozooecial aperture with apertural pore (arrow) and stellate structure (XCI 123); H, I – thin section showing autozooecial chambers (XCI 83); J – thin section showing autozooecial apertures with apertural pore (arrow) (XCI 82).
FIGURE 20 in Stenolaemate bryozoans from the Graham Formation, Pennsylvanian (Virgilian) at Lost Creek Lake, Texas, USA
FIGURE 20. Distribution of bryozoan growth forms (number of fragments) within the profiles B and C (samples B1-B4 contained almost no bryozoans).
FIGURE 16. Polypora triangularis Rogers, 1900 in Stenolaemate bryozoans from the Graham Formation, Pennsylvanian (Virgilian) at Lost Creek Lake, Texas, USA
FIGURE 16. Polypora triangularis Rogers, 1900 (A–G): A–C – colony fragments with intact chambers of reproductive heterozooecia (XCI 114); D – branch fragment with nanozooecia (XCI 115); E, F – branch fragment with autozooecial apertures with proximal pores (arrows) (XCI 116); G – branch fragment with nodes on the reverse side (XCI 117). Polypora aff. hexagona Moore, 1929 (H, I) – colony fragment with fenestrules, autozooecial apertures, and nodes (XCI 118).
FIGURE 14 in Stenolaemate bryozoans from the Graham Formation, Pennsylvanian (Virgilian) at Lost Creek Lake, Texas, USA
FIGURE 14. Cavernella praecavifera (Schulga-Nesterenko, 1951) (A–D): A – tangential section showing autozooecial apertures and chambers (XCI 69); B–D – tangential section showing cavernozooecia (arrows) (XCI 73). Acupipora elliptica (Rogers, 1900) (E) – colony fragment showing fenestrules, autozooecial apertures and nodes (XCI 113).
FIGURE 11. Laxifenestella placida Moore, 1929 in Stenolaemate bryozoans from the Graham Formation, Pennsylvanian (Virgilian) at Lost Creek Lake, Texas, USA
FIGURE 11. Laxifenestella placida Moore, 1929 (A–D): A – tangential section showing autozooecial apertures and keel with nodes (XCI 35); B – deep tangential section showing autozooecial chambers with hemisepta (XCI 65); C, D – colony fragment showing fenestrules, autozooecial apertures and keels with nodes (XCI 108). Laxifenestella texana n. sp. (E, F) – tangential section showing fenestrules, autozooecial apertures and chambers, keels with nodes, and reproductive heterozooecia (arrows), holotype (XCI 81).
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
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DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.