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272 results for “crocodiles”
Fig. 1 in Contributions to the herpetofauna of the Angolan Okavango-Cuando-Zambezi River drainages. Part 2: Lizards (Sauria), chelonians, and crocodiles
Fig. 1. Adult female Acanthocercus cf. cyanocephalus (PEM R23560) from Quembo River source. Photo by Werner Conradie.
Fig. 2 in Dwarfism and feeding behaviours in Oligo-Miocene crocodiles from Riversleigh, northwestern Queensland, Australia
Fig. 2. Vertebrae of mekosuchine crocodile Mekosuchus whitehunterensis Willis, 1997; White Hunter Site, Riversleigh World Heritage Area, northwestern Queensland, Australia; late Oligocene. A. Axis vertebra (QM F56039). B. Third cervical vertebra (QM F56040). C. Fourth cervical vertebra (QM F56041). D. Sixth cervical vertebra (QM F56042). E. Ninth cervical vertebra (QM F56043). F. Third thoracic vertebra (QM F56321). G. Third cervical vertebra (QM F56320). H. Eighth cervical vertebra (QM F56322). Arrows indicate extent of the neurocentral suture; left (A1–H1) and right (A2–H2) views.
Fig. 3 in Dwarfism and feeding behaviours in Oligo-Miocene crocodiles from Riversleigh, northwestern Queensland, Australia
Fig. 3. Vertebral morphology of mekosuchine crocodile Mekosuchus whitehunterensis Willis, 1997 (A, C, E) from White Hunter Site, Riversleigh World Heritage Area, northwestern Queensland, Australia, late Oligocene compared with Crocodylus johnstoni Krefft, 1873 (B, D, F) from upper Herbert River, northeastern Queensland, Australia, late Pleistocene– Holocene. Axis vertebrae (A, QM F56039; B, AR 17683). Third cervical vertebrae (C, QM F56040; D, AR 17683). Eighth cervical vertebrae (E, QM F56322; F, AR 17683). All in left view.
Fig. 1 in Dwarfism and feeding behaviours in Oligo-Miocene crocodiles from Riversleigh, northwestern Queensland, Australia
Fig. 1. Rostra of mekosuchine crocodile Mekosuchus whitehunterensis Willis, 1997; White Hunter Site, Riversleigh World Heritage Area, northwestern Queensland, Australia; late Oligocene. A. Left maxilla (QM F56046) in buccal (A1) and ventral (A2) views. B. Left dentary (QM F 56047) in lingual (B1), dorsal (B2), and buccal (B3) views.
Fig. 10 in Camallanid nematodes from Clarias gariepinus (Burchell, 1822) in the Crocodile River, Gauteng, South Africa: Exploring diversity and divergence in an acid-mine drainage impacted environment
Fig. 10. Bar graphs showing the ratio of life stages and sexes in each sample. A- Procamallanus (Procamallanus) pseudolaeviconchus Moravec and van As, 2015. B- Paracamallanus cyathopharynx (Baylis, 1923). Prevalence of each group in each month is given in the line graphs. F = female, M = male, L = larvae, US = unknown sex.
Fig. 8 in Camallanid nematodes from Clarias gariepinus (Burchell, 1822) in the Crocodile River, Gauteng, South Africa: Exploring diversity and divergence in an acid-mine drainage impacted environment
Fig. 8. Lateral view of isolated buccal capsules of Paracamallanus specimens, morphotypes A and B. (i). Brightfield. (ii). Epifluorescence [Filter-set 09 (Ex. 470/40)]. (iii). SEM. 1 = anterior part of posterior capsule; 2 = posterior part of posterior capsule; t = trident; ellipse = elliptical shape of capsule; rectangle = rectangular shape of capsule.
Fig. 9 in Camallanid nematodes from Clarias gariepinus (Burchell, 1822) in the Crocodile River, Gauteng, South Africa: Exploring diversity and divergence in an acid-mine drainage impacted environment
Fig. 9. Principal Component Analyses (PCA) of Paracamallanus morphometry collected from Clarias gariepinus (Burchell, 1822). A- PCA using morphometric ratios for both males and females. B- PCA using buccal capsule ratios for both males and females. Each parasite is indicated as a dot, with the fill, shape and colour corresponding to morphotype and lineage (refer to key). F = female; M = male.
Fig. 5 in Camallanid nematodes from Clarias gariepinus (Burchell, 1822) in the Crocodile River, Gauteng, South Africa: Exploring diversity and divergence in an acid-mine drainage impacted environment
Fig. 5. Scanning electron micrographs of male Paracamallanus cyathopharynx (Baylis, 1923) from Clarias gariepinus (Burchell, 1822). A-posterior end, ventrolateral view, arrows show precloacal papillae; Bposterior end, ventral view, solid arrow shows right spicule, dashed arrow shows pair of adcloacal papillae, double arrows show postcloacal papillae; Cisolated right spicule, ventrolateral view, arrow shows shaft; D-right spicule tip, dorsal view; E– right spicule tip, ventral view, arrow shows ventral barb; Fisolated left spicule.
Fig. 3 in Camallanid nematodes from Clarias gariepinus (Burchell, 1822) in the Crocodile River, Gauteng, South Africa: Exploring diversity and divergence in an acid-mine drainage impacted environment
Fig. 3. Scanning electron micrographs of Procamallanus (Procamallanus) pseudolaeviconchus Moravec and van As, 2015 from Clarias gariepinus (Burchell, 1822). A-postequatorial region of female, vulva, ventral view; B- vulva, lateral view, arrows show lips; C- first-stage larva exiting vulva; D-posterior end of male, ventral view, solid arrows show pre-cloacal papillae, dashed arrows show post-cloacal papillae, circles show adcloacal papillae; D(i)- pedunculate papilla; E– isolated right spicule, lateral view, solid arrow shows shaft, dashed arrow shows spicule tip; E (i)- right spicule tip, arrow shows velum; F- posterior end of male, ventrolateral view, arrow shows right spicule; G-isolated left spicule, lateral view; G(i)- left spicule tip, arrow shows velum.
Fig. 2 in Camallanid nematodes from Clarias gariepinus (Burchell, 1822) in the Crocodile River, Gauteng, South Africa: Exploring diversity and divergence in an acid-mine drainage impacted environment
Fig. 2. Scanning electron micrographs of Procamallanus (Procamallanus) pseudolaeviconchus Moravec and van As, 2015 from Clarias gariepinus (Burchell, 1822). A-anterior end, lateral view; B- anterior end, apical view, solid arrow shows smooth peribuccal flange, dashed arrow shows marginal elevation; Cisolated buccal capsule, lateral view, arrow shows oesophagus; D-isolated buccal capsule, apical view, solid arrows show marginal elevations; E– buccal capsule interior, apical view, dashed arrow shows narrow ring, solid arrow shows basal ring; F- microdissected buccal capsule, lateral view, dashed arrow shows narrow ring, solid arrow shows basal ring; Ganterior region, lateral view, arrow shows excretory pore; G(i)- excretory pore, lateral view; H- lateral deirid, lateral view; I- lateral deirid, apical view. a = amphid; s = submedian papilla.
Fig. 7 in Camallanid nematodes from Clarias gariepinus (Burchell, 1822) in the Crocodile River, Gauteng, South Africa: Exploring diversity and divergence in an acid-mine drainage impacted environment
Fig. 7. Phylogram of Camallanidae based on CO1 mtDNA, with Spirocerca lupi (Rudolphi, 1809) as the outgroup. Procamallanus data and Paracamallanus lineage one (LI1) and two (LI2) from the present study are indicated in purple, orange and green, respectively. Nodal support presented for Bayesian inference and Maximum Likelihood approaches (BI/ML), with support lower than 0.75/75% excluded and support above 0.9/90% indicated by an asterisk (*).
Fig. 6 in Camallanid nematodes from Clarias gariepinus (Burchell, 1822) in the Crocodile River, Gauteng, South Africa: Exploring diversity and divergence in an acid-mine drainage impacted environment
Fig. 6. Phylogram of Camallanidae based on 18S rDNA, with Spirocerca lupi (Rudolphi, 1809) as the outgroup. Procamallanus and Paracamallanus data from the present study are indicated in purple and orange, respectively. Nodal support presented for Bayesian inference and Maximum Likelihood approaches (BI/ML), with support lower than 0.75/75% excluded and support above 0.9/90% indicated by an asterisk (*).
Fig. 4 in Camallanid nematodes from Clarias gariepinus (Burchell, 1822) in the Crocodile River, Gauteng, South Africa: Exploring diversity and divergence in an acid-mine drainage impacted environment
Fig. 4. Scanning electron micrographs of Paracamallanus cyathopharynx (Baylis, 1923) from Clarias gariepinus (Burchell, 1822). A-anterior end, apical view; B- anterior end, apical view, arrow shows oesophagus; C- isolated buccal capsule, lateral view, arrow shows oesophagus; C(i)- isolated buccal capsule, lateral view, double arrow shows isthmus; D-microdissected anterior buccal capsule, ventral view of longitudinal ridges. E- lateral view of deirid; F, G, G(i)- posterior end of female, apical view, digit-like processes. a = amphid; s = submedian papilla; sc = sclerotised plate; t = trident; 1 = anterior buccal capsule; 2 = anterior part of posterior buccal capsule; 3 = posterior part of buccal capsule.
Fig. 1. Maps indicating the sampling locality within South Africa. A in Camallanid nematodes from Clarias gariepinus (Burchell, 1822) in the Crocodile River, Gauteng, South Africa: Exploring diversity and divergence in an acid-mine drainage impacted environment
Fig. 1. Maps indicating the sampling locality within South Africa. A- Map of Africa. B- Map of South Africa; red square highlighting area of interest. C- Map of Crocodile River flowing from Lake Heritage (sampling site) to Hartbeespoort Dam further downstream.
Fig. 4 in New records of Hepatozoon and Oswaldofilaria from saltwater crocodiles (Crocodylus porosus) in Australia
Fig. 4. Relationship of a new species of Oswaldofilaria (bold) from the blood of the saltwater crocodile with representative taxa represented in the GenBank database, established based on a phylogenetic analysis of sequence data from part of the mitochondrial cytochrome c oxidase subunit 1 gene (cox1; 681 bp) employing the neighbour-joining distance method. Branch supports are represented by neighbour-joining bootstrap percentages. Members of the genus Spirocerca were used as outgroups.
Fig. 3 in New records of Hepatozoon and Oswaldofilaria from saltwater crocodiles (Crocodylus porosus) in Australia
Fig. 3. Microfilaria of a species of Oswaldofilaria in a blood smear from a saltwater crocodile (Crocodylus porosus). Stained with Wright's Giemsa; examined at 100-times magnification; scale bar = 5 μm.
Fig. 1. A in New records of Hepatozoon and Oswaldofilaria from saltwater crocodiles (Crocodylus porosus) in Australia
Fig. 1. A stage of Hepatozoon identified in erythrocytes in blood smears from a saltwater crocodile (Crocodylus porosus). Stained with Wright's Giemsa; examined at 100× magnification; scale bar = 5 μm.
Fig. 2 in New records of Hepatozoon and Oswaldofilaria from saltwater crocodiles (Crocodylus porosus) in Australia
Fig. 2. Relationship of a new species of Hepatozoon (bold) identified in erythrocytes from the blood of the saltwater crocodile with representative taxa represented in the GenBank database, established based on a phylogenetic analysis of sequence data from part of the small subunit of nuclear ribosomal RNA gene (SSU; 889 bp) employing the neighbour-joining distance method. Branch supports are represented by neighbour-joining bootstrap percentages. Species of Dactylosoma were used as outgroups.
Data from: Ancestral hybridization yields evolutionary distinct hybrids lineages and species boundaries in crocodiles, posing unique conservation conundrums
<p>Interspecific hybridization can lead to adaptation and speciation, especially in the context of recent radiations. The emblematic <em>Crocodylus</em> (true crocodiles) is the most broadly distributed, ecologically diverse, and species-rich crocodylian genus. Nonetheless, their within-species evolutionary processes are poorly resolved mainly due to their potential for hybridization. Notably, the evolutionary outcomes when hybridization is ancient and involves long-lived species, like crocodiles, remain largely unexplored. Here, we evaluate the genomic admixture between the American (<em>Crocodylus</em> <em>acutus</em>) and the Morelet's (<em>Crocodylus</em> <em>moreletii</em>) species, and demonstrate that this hybridization system challenges the definition of species boundaries and poses a triple conservation conundrum: what has been recognized as <em>C. acutus</em> is actually two distinct species, therefore its taxonomic reassessment is needed; we identified two evolutionary distinct hybrids lineages, which are genetically discernible from the parental species; the remaining <em>C. moreletii </em>populations evidence its likely extinction as a species and/or evolution via hybridization. Hence, the crocodiles' distinct species and hybrids lineages warrant recognition and need urgent conservation efforts.</p>
Fig. 5 in A Comparative Study Of Crocodile Lizards (Shinisaurus Crocodilurus Ahl, 1930) From Vietnam And China
Fig. 5. Habitat of Shinisaurus crocodilurus in north-eastern Vietnam: the evergreen lowland forest of Yen Tu Nature Reserve, Quang Ninh province. Photograph by Le Khac Quyet.
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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.