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59 results for “crocodilian”
Figure 2 in New remains of a gavialoid crocodilian from the late Oligocene-early Miocene of the Pirabas Formation, Brazil
Figure 2. Gavialoid indet., partial symphyseal portion of mandible, MPEG 1130-V: A, ventral view and A1, schematic ventral view; B, lingual view and B1 schematic ventral view; C, right lateral view.
Figure 1 in New remains of a gavialoid crocodilian from the late Oligocene-early Miocene of the Pirabas Formation, Brazil
Figure 1. Summary map of the study region in north-east South America, showing the localities discussed in the text.
Data from: Sound categorization by crocodilians
<p>Dataset, acoustic signals and all original statistical codes used in the article "Sound categorization by crocodilians".</p>
Data from: Spatial and temporal variation in nest temperatures forecasts sex ratio skews in a crocodilian with environmental sex determination
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Data from: Ecological and evolutionary significance of a lack of capacity for extended developmental arrest in crocodilian eggs
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Data from: Rigorous approaches to species delimitation have significant implications for African crocodilian systematics and conservation
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Data from: Vascular patterns in the heads of crocodilians: blood vessels and sites of thermal exchange
Extant crocodilians are a highly apomorphic archosaur clade that is endothermic, yet often achieve large body sizes that can be subject to higher heat loads. Therefore, the anatomical and physiological roles that blood vessels play in crocodilian thermoregulation need further investigation to better understand how crocodilians establish and maintain cephalic temperatures and regulate neurosensory tissue temperatures during basking and normal activities. The cephalic vascular anatomy of extant crocodilians, particularly American alligator (Alligator mississippiensis) was investigated using a differential-contrast, dual-vascular injection technique and high resolution X-ray micro-computed tomography (μCT). Blood vessels were digitally isolated to create representations of vascular pathways. The specimens were then dissected to confirm CT results. Sites of thermal exchange, consisting of the oral, nasal, and orbital regions, were given special attention due to their role in evaporative cooling and cephalic thermoregulation in other diapsids. Blood vessels to and from sites of thermal exchange were studied to detect conserved vascular patterns and to assess their ability to deliver cooled blood to neurosensory tissues. Within the orbital region, both the arteries and veins demonstrated consistent branching patterns, with the supraorbital, infraorbital, and ophthalmotemporal vessels supplying and draining the orbit. The venous drainage of the orbital region showed connections to the dural sinuses via the orbital veins and cavernous sinus. The palatal region demonstrated a vast plexus that comprised both arteries and veins. The most direct route of venous drainage of the palatal plexus was through the palatomaxillary veins, essentially bypassing neurosensory tissues. Anastomotic connections with the nasal region, however, may provide an alternative route for palatal venous blood to reach neurosensory tissues. The nasal region in crocodilians is probably the most prominent site of thermal exchange, as it offers a substantial surface area and is completely surrounded by blood vessels. The venous drainage routes from the nasal region offer routes directly to the dural venous sinuses and the orbit, offering evidence of the potential to directly affect neurosensory tissue temperatures. The evolutionary history of crocodilians is complex, with large-bodied, terrestrial, and possibly endothermic taxa that may have had to deal with thermal loads that likely provided the anatomical building-blocks for such an extensive vascularization of sites of thermal exchange. A clear understanding of the physiological abilities and the role of blood vessels in the thermoregulation of crocodilians neurosensory tissues is not available but vascular anatomical patterns of crocodilian sites of thermal exchange indicate possible physiological abilities that may be more sophisticated than in other extant diapsids.
Surveys of crocodilians in the hydroelectric dam, Brazilian Amazonia
<p>We counts caimans in the Madeira River, before (2010-2011) and after (2012-2014, 2016-2019) hydroelectric dam.</p>
Figure 7 in Developmental patterns of the crocodilian and avian columella auris: reappraisal of interpretations of the derivation of the dorsal hyoid arch in archosaurian tetrapods
Figure 7. Development of the columella auris and surrounding tissues in Struthio camelus. A–F, day-13 embryo, transverse sections through the external and middle ear region. G, day-15 embryo, postero-left lateral view. H, day-16 embryo, right lateral view. For abbreviations see the Appendix. A–F, histological sections; G and H, whole mounts.
Figure 3 in New remains of a gavialoid crocodilian from the late Oligocene-early Miocene of the Pirabas Formation, Brazil
Figure 3. Reconstruction of the mandibular symphysis of Gavialoid indet., MPEG 1130-V.
Figure 4 in New remains of a gavialoid crocodilian from the late Oligocene-early Miocene of the Pirabas Formation, Brazil
Figure 4. Gavialoid indet., right lateral portion of mandible, MPEG 1010-V, in lateral view.
Data from: The remarkable convergence of skull shape in crocodilians and toothed whales
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Data from: Vascular patterns in the heads of crocodilians: blood vessels and sites of thermal exchange
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Surveys of crocodilians in the hydroelectric dam, Brazilian Amazonia
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Figure 4 in Asynchronous reproduction in three species of crocodilians in south-eastern Amazonia
Figure 4. Distances of Caiman crocodilus, Melanosuchus niger and Paleosuchus trigonatus nests from the nearest water, Xingu River region, Belo Monte dam, Amazonia, Brazil.
Figure 2 in Asynchronous reproduction in three species of crocodilians in south-eastern Amazonia
Figure 2. Number of eggs of Caiman crocodilus (CC), Melanosuchus niger (MN), and Paleosuchus trigonatus (PT) near the Xingu River, Brazil.
Figure 1 in Asynchronous reproduction in three species of crocodilians in south-eastern Amazonia
Figure 1. Spatial distribution of nests located in four reproductive periods between 2013–2014 and 2016–2017, of Paleosuchus trigonatus (Δ), Caiman crocodilus (⁗), and Melanosuchus niger (ο), in the Xingu River region, Belo Monte Hydroelectric dam, Amazonia, Brazil.
Figure 3 in Asynchronous reproduction in three species of crocodilians in south-eastern Amazonia
Figure 3. Variation in precipitation (continuous line) and height of the Xingu River (closed circle) before (a) and after (e) reservoir filling, between June (6) and April (16) of the next year. Numbers of clutches laid (black bars) and number of clutches hatching (shaded bars) of Paleosuchus trigonatus in each month, before (b) and after (f) reservoir filling of the Belo Monte Hydroelectric dam, Amazonia, Brazil. Numbers of clutches laid (black bars) and number of clutches hatching (shaded bars) of Melanosuchus niger in each month, before (c) and after (g) reservoir filling. Numbers of clutches laid (black bars) and number of clutches hatching (shaded bars) of Caiman crocodilus in each month, before (d) and after (h) reservoir filling.
Figure 5. Gavialoid indet., MPEG 608-V in New remains of a gavialoid crocodilian from the late Oligocene-early Miocene of the Pirabas Formation, Brazil
Figure 5. Gavialoid indet., MPEG 608-V. Anterior and lateroventral view (A, A1, respectively) of the articular region of a left mandible; isolated tooth, MPEG 116-V (B); isolated tooth, MPEG 1129-V (C). MPEG 609-V; right lateral view of incomplete fifth cervical vertebra, MPEG 609-V (D). Abbreviations: gf, fossa glenoid; s, surangular; sas, surangular-articular suture; rap, retroarticular process.
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Allen Brain Atlas
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
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OpenNeuro
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