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61 results for “Didelphis”
FIG. 2. Didelphis virginiana AMNH M-217731 in Transverse Canal Foramen And Pericarotid Venous Network In Metatheria And Other Mammals
FIG. 2. Didelphis virginiana AMNH M-217731 (Didelphidae, Didelphimorphia), caudal cranium in A, ventral; B, oblique caudal, and C, endocranial views. In C, only one foramen (for internal carotid neurovascular bundle) opens into endocranial carotid groove, because caudal branch of transverse canal vein and its foramen are not present. Small aperture opening in rostral wall of hypophyseal fossa is cranio-
FIG. 4. Didelphis virginiana TMM M-2517 in Transverse Canal Foramen And Pericarotid Venous Network In Metatheria And Other Mammals
FIG. 4. Didelphis virginiana TMM M-2517 (Didelphidae, Didelphimorphia), adult specimen, endocast reconstruction showing osteological features associated with pericarotid venous network and related vasculature (data source, table 2). In this and all other figures depicting endocasts, unless indicated otherwise red-colored structures are casts of carotid canal, and thus represent both internal carotid artery and internal carotid vein. Blue-colored structures mostly represent venous conduits. Isolated portions of certain trackways have been reconnected to restore continuity of ventral petrosal sinus, extracranial continuation of ventral petrosal sinus, and sigmoid sinus. Views: A, ventral; B, same, with transverse basisphenoid sinus (in green) superimposed; C, oblique right lateral; D, oblique dorsal closeup of transverse canal junction (simple pattern); E, oblique caudoventral surface of intact caudal cranium. In D, note craniopharyngeal canal and interstitial canaliculi communicating with transverse canal along different planes. Canals actually open into transverse basisphenoid sinus, although this is not obvious because of color coding. Gap (asterisk) locates positions of cavernous sinus and pituitary. In E, extracranial continuation of ventral petrosal sinus reconstructed and shown passing, suc-
FIG. 5. Didelphis virginiana TMM M-2517 in Transverse Canal Foramen And Pericarotid Venous Network In Metatheria And Other Mammals
FIG. 5. Didelphis virginiana TMM M-2517 (Didelphidae, Didelphimorphia), adult caudal cranium, selected coronal (A–H) and parasagittal (I–K) segments (data source, table 2). In A and B, note junction of rostral branches of transverse canals, communicating with but not enveloped by transverse basicranial sinus. Boundary between transverse basisphenoid sinus and regular diploe is gradational. In B–D, craniopharyngeal canal, of uncertain function, connects transverse canal junction with hypophyseal infundibular sulcus (see also I). In E, true caudal branches of transverse canals are absent; only short interstitial canaliculi represented. In J and K, pneumatized areas (possible additional sites of hematopoiesis) also seen in basioccipital and presphenoid). Key: AS, alisphenoid; BO, basioccipital; BS, basisphenoid; cc, carotid canal; cpc, craniopharyngeal canal; cpf, craniopharyngeal foramen; crp, cribriform plate; ctbs, caudal portion of transverse basisphenoid sinus; el, ethmoid labyrinth; encf, endocranial carotid foramen; encg, endocranial carotid groove; excf, exocranial carotid foramen; fm, foramen magnum; FR, frontal; his, hypophyseal infundibular sulcus; hpf, hypophyseal fossa; isc, interstitial canaliculus; junc, junction of transverse canals; junc + rtbs, combined junction and rostral transverse basisphenoid sinus; le, lateral extension of transverse basisphenoid
Figure 1 in Breeding and reproductive behaviour of the neo-tropical opossum, Didelphis marsupialis insularis, Allen 1902 under captive conditions
Figure 1. Design and layout of Adult Units using a Single Corridor Layout. Source: Tardieu and Garcia, 2018).
Figure 2 in Breeding and reproductive behaviour of the neo-tropical opossum, Didelphis marsupialis insularis, Allen 1902 under captive conditions
Figure 2. Photo of opossum breeding unit showing – (A) Human Access panel to Male; (B) Male Cage; (C & D) Male Access panels to females; (E) Female Cage; (F) Human Access panel to Female.
Fig. 1 in Eosinophilic meningoencephalitis associated with rat lungworm (Angiostrongylus cantonensis) migration in two nine-banded armadillos (Dasypus novemcinctus) and an opossum (Didelphis virginiana) in the southeastern United States
Fig. 1. Caudal end of a male nematode extracted from the brain of Armadillo 1. Arrow indicates bursal rays.
Fig. 2. Neuroparenchyma. Fig. 2a in Eosinophilic meningoencephalitis associated with rat lungworm (Angiostrongylus cantonensis) migration in two nine-banded armadillos (Dasypus novemcinctus) and an opossum (Didelphis virginiana) in the southeastern United States
Fig. 2. Neuroparenchyma. Fig. 2a: Armadillo B. High numbers of eosinophils and lymphocytes expand the perivascular spaces. A focus of hemorrhage, eosinophils, and glial cells interrupts the neuroparenchyma. Photomicrographs are stained with hematoxylin and eosin (H&E). Bar = 200 Mm. Fig. 2b: Armadillo A. Cross section of a nematode larva (200 Mm width) within the thalamus is characterized by a smooth cuticle, coelomyarian musculature, lateral cords, and a distinct pharynx (consistent with a metastrongyle). No inflammatory cells surround the nematode. H&E, Bar = 50 Mm.
Figs 14-17 in Dental anomalies in Didelphis albiventris (Mammalia, Marsupialia, Didelphidae) from Argentina, Brazil and Uruguay
Figs 14-17. Dental anomalies in Didelphis albiventris Lund, 1840 and D. marsupialis Linnaeus, 1758: 14, MZUSP 2996; 15, MNHN 3963; 16, MACN 24163; 17, MZUSP 4745. White arrows indicate the anomaly. See teXt for details.
Figs 8-13 in Dental anomalies in Didelphis albiventris (Mammalia, Marsupialia, Didelphidae) from Argentina, Brazil and Uruguay
Figs 8-13. Dental anomalies in Didelphis albiventris Lund, 1840: 8, ZVC 1285; 9, CFA 2663; 10, CFA 10249; 11, MACN 24168; 12, MACN 32.184; 13, MACN 36.734. White arrows indicate the anomaly. See teXt for details.
Figs 2-7 in Dental anomalies in Didelphis albiventris (Mammalia, Marsupialia, Didelphidae) from Argentina, Brazil and Uruguay
Figs 2-7. Dental anomalies in Didelphis albiventris Lund, 1840: 2, CFA 3235; 3, MACN 36753; 4, MACN 24174; 5, MACN 25.23; 6, MNHN 2590; 7, MACN 49.49. White arrows indicate the anomaly. See teXt for details.
Fig. 1 in Dental anomalies in Didelphis albiventris (Mammalia, Marsupialia, Didelphidae) from Argentina, Brazil and Uruguay
Fig. 1. Map with distribution of the analyzed specimens of Didelphis albiventris Lund, 1840 (grey squares), and distribution of the specimens with dental anomalies (black circles).
Fig. 1 in Surveillance and genotype characterization of zoonotic trypanosomatidae in Didelphis marsupialis in two endemic sites of rural Panama
Fig. 1. Map showing the communities of Las Pavas (LP) (top set of images) and Trinidad de Las Minas (TM) (bottom set of images) with the number of opossums captured and infected with T. cruzi in the 3 collection sites in each community. A. Map with the geographic location of the LP and TM communities in the country of Panama. Satellite view of the P: Peridomicile (B), R1: remnant 1 (C) and R2: remnant 2 (D) collection site each with its 4 transects in the LP community. Satellite view of the P: Peridomicile (E), R1: remnant 1 (F) and R2: remnant 2 (G) collection site each with its 4 transects in the TM community.
Three-dimensional mandibular kinematics of mastication in the marsupial Didelphis virginiana
<p><span><em>Didelphis virginiana</em> </span>(the Virginia opossum) is often used as an extant model for understanding feeding behavior in Mesozoic mammaliaforms, primarily due to their morphological similarities, including an unfused mandibular symphysis and tribosphenic molars. However, the 3D jaw kinematics of opossum chewing have not yet been fully quantified. We used biplanar videofluoroscopy and the X-Ray Reconstruction of Moving Morphology workflow to quantify mandibular kinematics in four wild-caught opossums feeding on hard (almonds) and soft (cheese cubes) foods. These data were used to test hypotheses regarding the importance of roll versus yaw in chewing by early mammals, and the impact of food material properties (FMPs) on jaw kinematics. The magnitude of roll exceeds that of yaw, but both are necessary for tooth-tooth or tooth-food-tooth contact between complex occlusal surfaces. We confirmed the utility of the four vertical kinematic gape cycle phases identified in tetrapods but we further defined two more in order to capture non-vertical kinematics. Statistical tests support the separation of chew cycle phases into two functional groups: occlusal and non-occlusal phases. The separation of slow close into two (occlusal) phases gives quantitative kinematic support for the long-hypothesized multifunctionality of the tribosphenic molar.</p>
Three-dimensional mandibular kinematics of mastication in the marsupial Didelphis virginiana
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Didelphis virginiana (Didelphidae) - whole organism
Image of Didelphis virginiana (Didelphidae) - whole organism
Didelphis virginiana (Didelphidae) - whole organism
Image of Didelphis virginiana (Didelphidae) - whole organism
Figure 3 in Breeding and reproductive behaviour of the neo-tropical opossum, Didelphis marsupialis insularis, Allen 1902 under captive conditions
Figure 3. Photo of opossum breeding unit showing view from top of enclosure.
Data from: Transcriptomic analysis of skin pigmentation variation in the Virginia opossum (Didelphis virginiana).
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FIGURE 4 in Eimeria spp. (Apicomplexa: Eimeriidae) in Didelphis aurita Wied-Neuwied, 1826 (Didelphimorphia: Didelphidae) and description of a new species infecting this opossum
FIGURE 4. Eimeria caluromydis. Stieda body (black arrow), substieda body (red arrow) and sporocyst residuum (grey arrow). Scale bar 10µm
FIGURE 3. Eimeria auritanensis. A in Eimeria spp. (Apicomplexa: Eimeriidae) in Didelphis aurita Wied-Neuwied, 1826 (Didelphimorphia: Didelphidae) and description of a new species infecting this opossum
FIGURE 3. Eimeria auritanensis. A—Polar granule (black arrow) and sporocyst residuum (yellow arrow); B—Stieda body (blue arrow). Scale bar 10µm
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