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19 results for “Pouch Young”
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.
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.
Figure 15 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 15. Computed tomography image of the skull and dentition of AM P 762, taken from the supplementary data of Newton et al. (2018). The figure clearly shows the erupted dP3 in both jaws, and the unerupted successor P3 immediately anterior to their predecessors. Scale bar equals 5 mm. Other early erupting and unerupted teeth are clearly labeled. C, successional canine; dP1, deciduous first premolar; dP2, deciduous second premolar; dP3, deciduous third premolar; M1, first molar; P3, successional third premolar.
Figure 7 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 7. Longitudinal section through the apex of the small dP3, with its disrupted dentin and thick enamel. A segment of its lingual successional lamina is evident, but its attachment to the outer enamel epithelium is not evident in this section. d, dentin; e, enamel; lsl, lingual successional lamina.
Data from: Letting the "cat" out of the bag: pouch young development of the extinct Tasmanian tiger revealed by X-ray computed tomography
The Tasmanian tiger or thylacine (Thylacinus cynocephalus) was an iconic Australian marsupial predator that was hunted to extinction in the early 1900s. Despite sharing striking similarities with canids, they failed to evolve many of the specialized anatomical features that characterize carnivorous placental mammals. These evolutionary limitations are thought to arise from functional constraints associated with the marsupial mode of reproduction, in which otherwise highly altricial young use their well-developed forelimbs to climb to the pouch and mouth to suckle. Here we present the first 3D digital developmental series of the thylacine throughout its pouch life using X-ray computed tomography on all known ethanol-preserved specimens. Based on detailed skeletal measurements, we refine the species growth curve to improve age estimates for the specimens. Comparison of allometric growth trends in the appendicular skeleton (fore- and hindlimbs) with that of other placental and marsupial mammals revealed that despite their unique adult morphologies, thylacines retained a generalized early marsupial ontogeny. Our approach also revealed mislabelled specimens that possessed large epipubic bones (vestigial in thylacine) and differing vertebral numbers. All of our generated CT models are publicly available, preserving their developmental morphology and providing a novel digital resource for future studies of this unique marsupial.
Data from: Letting the “cat” out of the bag: pouch young development of the extinct Tasmanian tiger revealed by X-ray computed tomography
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