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27 results for “Didelphis virginiana”
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
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.
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
Data from: Transcriptomic analysis of skin pigmentation variation in the Virginia opossum (Didelphis virginiana).
Open the record for dataset details and reuse information.
On following pages: 50. Big Lutrine Opossum (Lutreolina crassicaudata); 51. Massoia's Lutrine Opossum (Lutreolina massoia); 52. Virginia Opossum (Didelphis virginiana), 53. Brazilian White-eared Opossum (Didelphis albiventris); 54. Guianan White-eared Opossum (Didelphis imperfecta); 55. Andean White-eared Opossum (Didelphis pernigra); 56. Southern Black-eared Opossum (Didelphis aurita); 57. Northern Black-eared Opossum (Didelphis marsupialis). in Didelphidae
On following pages: 50. Big Lutrine Opossum (Lutreolina crassicaudata); 51. Massoia's Lutrine Opossum (Lutreolina massoia); 52. Virginia Opossum (Didelphis virginiana), 53. Brazilian White-eared Opossum (Didelphis albiventris); 54. Guianan White-eared Opossum (Didelphis imperfecta); 55. Andean White-eared Opossum (Didelphis pernigra); 56. Southern Black-eared Opossum (Didelphis aurita); 57. Northern Black-eared Opossum (Didelphis marsupialis).
On following pages: 50. Big Lutrine Opossum (Lutreolina crassicaudata); 51. Massoia's Lutrine Opossum (Lutreolina massoia); 52. Virginia Opossum (Didelphis virginiana), 53. Brazilian White-eared Opossum (Didelphis albiventris); 54. Guianan White-eared Opossum (Didelphis imperfecta); 55. Andean White-eared Opossum (Didelphis pernigra); 56. Southern Black-eared Opossum (Didelphis aurita); 57. Northern Black-eared Opossum in Didelphidae
On following pages: 50. Big Lutrine Opossum (Lutreolina crassicaudata); 51. Massoia's Lutrine Opossum (Lutreolina massoia); 52. Virginia Opossum (Didelphis virginiana), 53. Brazilian White-eared Opossum (Didelphis albiventris); 54. Guianan White-eared Opossum (Didelphis imperfecta); 55. Andean White-eared Opossum (Didelphis pernigra); 56. Southern Black-eared Opossum (Didelphis aurita); 57. Northern Black-eared Opossum
FIGURE 6. A in Morphological and molecular data on helminths of Didelphis virginiana and Philander vossi (Mammalia: Didelphidae) from the Yucatán Peninsula, southeast Mexico
FIGURE 6. A. Posterior end of male Trichuris minuta from Didelphis virginiana showing the cilindrical spicular sheath, lateral view. B. Esophagus-intestine junction, and vulva of female Trichuris sp. from Philander vossi, lateral view. C. SEM micrograph of female proboscis of Oligacanthorhynchus microcephalus, lateral view. Abbreviations: egg (e), hook (h), proboscis (p), spicule (s), trunk (t), vulva (v), spicule sheath (ss), distal cloacal tube (dct).
FIGURE 2 in Morphological and molecular data on helminths of Didelphis virginiana and Philander vossi (Mammalia: Didelphidae) from the Yucatán Peninsula, southeast Mexico
FIGURE 2. Mathevotaenia sp. from Didelphis virginiana. A. SEM micrograph of scolex in lateral view. B. Mature proglottid in dorsal view. Abbreviations: sucker (s), cirrus sac (cs), ovary (o), testis (t), vitelline gland (vg).
FIGURE 1 in Morphological and molecular data on helminths of Didelphis virginiana and Philander vossi (Mammalia: Didelphidae) from the Yucatán Peninsula, southeast Mexico
FIGURE 1. Brachylaima sp. and Platynosomum illiciens from Didelphis virginiana. A. Adult specimen of Brachylaima sp., ventral view. B. SEM micrograph of Brachylaima sp. anterior end, ventral view. C. Adult specimen of Platynosomum illiciens ventral view. Abbreviations: oral sucker (os), ventral sucker (vs), testis (t), vitellaria (v), ovary (o), genital pore (gp).
FIGURE 9 in Morphological and molecular data on helminths of Didelphis virginiana and Philander vossi (Mammalia: Didelphidae) from the Yucatán Peninsula, southeast Mexico
FIGURE 9. Maximum-likelihood (ML) phylogenetic tree of Trichostrongylidea inferred with 28S rRNA sequence data using the GTR + G model (ln likelihood -6392.437537). GenBank accession numbers precede species name, followed by host name. Bootstrap support values for ML are provided at the nodes. The new sequences of the present study are in bold.
FIGURE 4. A in Morphological and molecular data on helminths of Didelphis virginiana and Philander vossi (Mammalia: Didelphidae) from the Yucatán Peninsula, southeast Mexico
FIGURE 4. A. Male caudal bursa of Viannaia arriguensis from Philander vossi, ventral view. B. Male caudal bursa of Viannaia sp. from Didelphis virginiana, ventral view. C. Cross section at midbody showing features of the synlophe of male Travassostrongylus sp. from Didelphis virginiana. D. Male caudal bursa of Travassostrongylus sp. from Didelphis virginiana, ventral view. E. Anterior end of female Strongyloides sp. from Philander vossi, ventral view. F. Female tail of Strongyloides sp. from Philander vossi showing the anus, lateral view. G. Vulva of Strongyloides sp. from Philander vossi, lateral view. Abbreviations: anus (a), egg (e), intestine (i), spicule (s), vulva (v), dorsal ray (dr), esophagus (es).
FIGURE 8 in Morphological and molecular data on helminths of Didelphis virginiana and Philander vossi (Mammalia: Didelphidae) from the Yucatán Peninsula, southeast Mexico
FIGURE 8. Maximum-likelihood (ML) phylogenetic tree of Anoplocephalidae inferred with 28S rRNA sequence data using the GTR + G model (ln likelihood -10764.655700). GenBank accession numbers precede species name, followed by host name. Bootstrap support values for ML are provided at the nodes. The new sequences of the present study are in bold.
FIGURE 7 in Morphological and molecular data on helminths of Didelphis virginiana and Philander vossi (Mammalia: Didelphidae) from the Yucatán Peninsula, southeast Mexico
FIGURE 7. Maximum-likelihood (ML) phylogenetic tree of Brachylaimidea inferred with 28S rRNA sequence data using the TVM + G (ln likelihood -4739.195144). GenBank accession numbers precede species name, followed by host name. Bootstrap support values for ML are provided at the nodes. The new sequences of the present study are in bold.
FIGURE 3 in Morphological and molecular data on helminths of Didelphis virginiana and Philander vossi (Mammalia: Didelphidae) from the Yucatán Peninsula, southeast Mexico
FIGURE 3. Males of Cruzia americana and Cruzia tentaculata from Didelphis virginiana. A. SEM micrograph of C. americana anterior end, apical view. B. SEM micrograph of internal structures of pharynx (columnar structures of cuticular lamellae) of C. americana, longitudinal section. C. SEM micrograph of C. americana posterior end, lateral view. D. Cruzia americana posterior end, ventral view. E. Gubernaculum of C. americana, ventral view. F. Internal structures of pharynx (columnar structures of cuticular lamellae) of C. tentaculata, longitudinal section. G. Gubernaculum of C. tentaculata, ventral view. Abbreviations: amphid (a), dorsal lip (dl), ventral lip (vl), papillae (p), pharyngeal lamellae (pl), paracloacal papillae (pac), precloacal papillae (pec), poscloacal papillae (poc), single precloacal papilla (spec), teeth (t).
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