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24 results for “Thylacinus cynocephalus”
Figure 17 in Microscopic analysis of the developing dentition in the pouch young of the extinct marsupial Thylacinus cynocephalus, with an assessment of other developmental stages and eruption
Figure 17. Selected dentaries of Thylacinus showing differences in the diastemata between the premolars as the effect of increasing age. A, subadult (in labial view) with m3 erupted, but not m4. Only slight suggestions of diastemata are evident between the premolars; B (lingual view) and C (labial view), showing later stages of m4 eruption and the increase of diastemata in adults.
Figure 16 in Microscopic analysis of the developing dentition in the pouch young of the extinct marsupial Thylacinus cynocephalus, with an assessment of other developmental stages and eruption
Figure 16. Later stages of early eruption in Thylacinus showing the presence and early loss of dp3 in the dentary. A, Part of the dentary (CU A6 7/10), redrawn from Moeller (1968), showing the erupted dp3, the unerupted successor p3 in its alveolar crypt, immediately anterior to dp3, and the erupting m1. The erupting dp1 and dp2 are also labeled; B, A slightly later stage of eruption in the dentary (USNM 115365) shows that the dp3 has been lost, and successor p3 is in early eruption. The m1 is now almost completely erupted. c indicates lower successional canine in B.
Figure 13 in Microscopic analysis of the developing dentition in the pouch young of the extinct marsupial Thylacinus cynocephalus, with an assessment of other developmental stages and eruption
Figure 13. Computed tomography images from the supplementary data of Newton et al. (2018). A, section of the skull and dentition from TMAG A931, a thylacine pouch young of 35 - 37 days old; B, Section of the skull and dentition from TMAG A930, a thylacine pouch young of 66 - 67 days old. Scale bars are 5 mm. C, canine; dP1, deciduous first premolar; dP2, deciduous second premolar; dP3, deciduous third premolar; M1, first molar; P3, successional third premolar.
Figure 12 in Microscopic analysis of the developing dentition in the pouch young of the extinct marsupial Thylacinus cynocephalus, with an assessment of other developmental stages and eruption
Figure 12. Section through dp3 and its successor p3. Only a small fragment of the lingual successional lamina is evident. Compare this single section with the camera lucida drawings in Figure 11. dp3, deciduous third premolar; lsl, lingual successional lamina; p3, successional third premolar.
Figure 10 in Microscopic analysis of the developing dentition in the pouch young of the extinct marsupial Thylacinus cynocephalus, with an assessment of other developmental stages and eruption
Figure 10. Section through the level of the metacone on M1, with thick enamel on its apex and disrupted dentin; d, dentin; e, enamel; me, metacone apex.
Figure 11 in Microscopic analysis of the developing dentition in the pouch young of the extinct marsupial Thylacinus cynocephalus, with an assessment of other developmental stages and eruption
Figure 11. Camera lucida drawings of dp3 and p3 in the dentary, at different planes of section. A, The lingual successional lamina is fragmented, but still largely intact, between the small dp3 and its larger successional p3; B, The small dp3 is evident with its dentin and enamel, and its primary dental lamina connection to the oral epithelium is fragmented but still evident. The section through the successor p3 is not central, but it shows the fragmented lingual successional lamina between the two teeth. A, ameloblasts; AB, alveolar bone; D, dentin; dp3, deciduous third premolar; E, enamel; O, odontoblasts; OE, oral epithelium; P, dental papilla; p3, successor third premolar; PL, primary dental lamina; SL, lingual successional lamina; SR, stellate reticulum.
Figure 6 in Microscopic analysis of the developing dentition in the pouch young of the extinct marsupial Thylacinus cynocephalus, with an assessment of other developmental stages and eruption
Figure 6. Longitudinal section through dP2, with disrupted dentin and well - developed enamel. d, dentin; e, enamel.
Figure 9 in Microscopic analysis of the developing dentition in the pouch young of the extinct marsupial Thylacinus cynocephalus, with an assessment of other developmental stages and eruption
Figure 9. Section of M1, at level of paracone. A, paracone with overlying epithelial nodule; B, paracone at more central level, lacking the epithelial nodule; en, epithelial nodule; pa, paracone apex.
Figure 3 in Microscopic analysis of the developing dentition in the pouch young of the extinct marsupial Thylacinus cynocephalus, with an assessment of other developmental stages and eruption
Figure 3. Histological section of I1 in Thylacinus, in middle bell stage. dp, dental papilla; en, epithelial nodule; o, oral epithelium; pdl, primary dental lamina.
Figure 1 in Microscopic analysis of the developing dentition in the pouch young of the extinct marsupial Thylacinus cynocephalus, with an assessment of other developmental stages and eruption
Figure 1. Thylacinus (71.1 mm Head Length) pouch young, with unerupted dentition; redrawn from Flower, 1867. C, upper and lower canine; dP3, upper and lower deciduous third premolar; M1, upper and lower first molar; P3, upper and lower successional third premolar.
Figure 5 in Microscopic analysis of the developing dentition in the pouch young of the extinct marsupial Thylacinus cynocephalus, with an assessment of other developmental stages and eruption
Figure 5. Longitudinal section through large successional upper canine, with disrupted dentin and well -developed enamel. d, dentin; e, enamel.
Figure 8. Late bell stage successor P3 in Microscopic analysis of the developing dentition in the pouch young of the extinct marsupial Thylacinus cynocephalus, with an assessment of other developmental stages and eruption
Figure 8. Late bell stage successor P3. This tooth lies anterior to dP3 and it lacks dentin and enamel. lsl, short segment of lingual successional lamina; t, tongue.
Figure 2. Sibling pouch young thylacines. A, NMV C5754 in Microscopic analysis of the developing dentition in the pouch young of the extinct marsupial Thylacinus cynocephalus, with an assessment of other developmental stages and eruption
Figure 2. Sibling pouch young thylacines. A, NMV C5754, male specimen sectioned for histology images; B, NMV C 5757, female specimen, used by Feigin et al. (2018) for genomic analysis.
Figure 14 in Microscopic analysis of the developing dentition in the pouch young of the extinct marsupial Thylacinus cynocephalus, with an assessment of other developmental stages and eruption
Figure 14. Images of the head, skull, and dentition of the thylacine pouch young from the Australian Museum (AM P 762). A, X-ray of the skull, showing deciduous and successional teeth in varying stages of development and early eruption; B, Head and upper body of the pouch young, prior to X-ray analysis; C, Higher magnification of a portion of the X-ray shown in figure A, with emphasis on the erupted lower dp3, and the unerupted but larger successional p3 immediately anterior to it.
FIG. 31. Thylacinus cynocephalus NMB c.2526 in Transverse Canal Foramen And Pericarotid Venous Network In Metatheria And Other Mammals
FIG. 31. Thylacinus cynocephalus NMB c.2526 (Thylacinidae, Dasyuromorphia), adult caudal cranium, selected coronal segments in rostrocaudal order (data source, table 2). In A and B, apart from endocranial apertures of carotid canals, there are no additional openings in endocranial floor and no evidence of transverse canal junction rostral to hypophyseal fossa. These facts are consistent with rostral branch of transverse canal vein being absent, and caudal branch sharing foramen with internal carotid neurovascular bundle. In C–F, two carotid and two transverse canals briefly coalesce to form composite space (asterisk). Whether this coalescence occurs in other thylacine skulls is likely but poorly documented. Key: AS, alisphenoid; astp, tympanic process of alisphenoid; bcf, basicapsular fenestra; BS, basisphenoid; cc, carotid canal; co, cochlea; cspf, craniospinal foramen; ctbs, caudal portion of transverse basisphenoid sinus; encf, endocranial carotid foramen; EO, exoccipital; evpf, foramen for extra-
FIG. 30. Thylacinus cynocephalus NMB c.2526 in Transverse Canal Foramen And Pericarotid Venous Network In Metatheria And Other Mammals
FIG. 30. Thylacinus cynocephalus NMB c.2526 (Thylacinidae, Dasyuromorphia), adult specimen, endocast reconstruction showing osteological features associated with pericarotid venous network and related vasculature (data source, table 2; color key, fig. 4). Views: A, ventral; B, same, with transverse basisphenoid sinus superimposed; C, oblique right lateral; D, closeup of mesocranial vascular features; E, ventrolateral surface, intact caudal cranium; F, as in D, but with shape of hypophyseal fossa (yellow) separately depicted and resected to show position of endocarotid foramina. In A and B, carotid and transverse canals form complicated multiple union; see text and also figures 29 and 31. In C, no sulcus is in evidence to connect jugular foramen with sigmoid sinus trackway (which instead exclusively joins sulcus for vertebral vein), consistent with internal jugular vein reduced or absent. In D, single asterisks indicate small openings in transverse canals and other features, mostly representing connection points (interstitial canaliculi) with transverse basisphenoid sinus. In F, communication between caudal branch veins, cavernous sinus, and internal carotid vein is suggested but its actual soft-tissue form cannot be reconstructed. Because both CRVs originate from CS/ICV they are not considered to form a confluence like that of RBVs. Internal carotid artery would have passed rostrally out of endocranial carotid foramen as ophthalmic artery. Other features in D: a, large connector joining transverse canal to accessory ventral petrosal sinus; b, intercanal branch, significance unknown; c, notochord (or transclival canal); d, reduced left accessory ventral petrosal sinus, partly hidden by carotid canal (compare right side); e, canaliculus linking c and d. Key: avpsc, canal for right accessory ventral petrosal sinus; cbtc, caudal branch of transverse canal (pathway); cc, carotid canal; cchc, caudal condylohypoglossal
FIG. 29. Thylacinus cynocephalus AMNH M-144316 in Transverse Canal Foramen And Pericarotid Venous Network In Metatheria And Other Mammals
FIG. 29. Thylacinus cynocephalus AMNH M-144316 (Thylacinidae, Dasyuromorphia), adult specimen, coronally hemisected skull. Views: A, ventral; B, oblique ventrolateral; C, oblique dorsocaudal; and D, coronal section through mesocranium, caudal aspect, closeup of endocranial carotid grooves. Asterisks mark union of carotid and transverse canals in base of carotid grooves (see fig. 31). In this version of hybrid configuration, interpretation is that enlarged caudal branch vein arising from cavernous sinus shares carotid groove with internal carotid neurovascular bundle before separating and departing through transverse canal to join trunk. For this reason,
Figure 4. Longitudinal section through I4 and transverse section through smaller I3. e in Microscopic analysis of the developing dentition in the pouch young of the extinct marsupial Thylacinus cynocephalus, with an assessment of other developmental stages and eruption
Figure 4. Longitudinal section through I4 and transverse section through smaller I3. e, disrupted enamel.
Thylacinus Cynocephalus cranium
Metashape (130 cameras) Made by [Renee Dixson](https://twitter.com/Renee_Dixson), [Skullbook - Digital Bone Library](http://cdhr.cass.anu.edu.au/research/projects/skullbook-digital-bone-library) Source: Objaverse 1.0 / Sketchfab
Thylacinus Cynocephalus cranium
Range Vision, 3D Spectrum scanner Made by [Renee Dixson](https://twitter.com/Renee_Dixson), [Skullbook - Digital Bone Library](http://cdhr.cass.anu.edu.au/research/projects/skullbook-digital-bone-library) Source: Objaverse 1.0 / Sketchfab
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