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
Abstract: Luckett, W.P., Hong Luckett, N. and Harper, T. 2019. 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. Memoirs of Museum Victoria 78: 1-21. A pouch young of the extinct dasyuromorphian marsupial Thylacinus cynocephalus was examined histologically to study the stages of the developing dentition during the pre-eruptive period of development. Both deciduous and successional stages of … Show more
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Cited by 3 publications
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The current literature on marsupial phylogenetics includes numerous studies based on analyses of morphological data with relatively limited sampling of Recent and fossil taxa, and many studies based on analyses of molecular data that include a dense sampling of Recent taxa, but relatively few that combine both data types. Another dichotomy in the 9 2021) belonging to seven clades that are currently ranked as orders in the Linnean hierarchy (Table 1; Aplin and Archer, 1987;Wilson and Reeder, 2005;Burgin et al., 2018;Eldridge et al., 2019): Didelphimorphia (opossums), Paucituberculata (shrew opossums), Microbiotheria (the "monito del monte" Dromiciops gliroides), Dasyuromorphia (predominantly carnivorous forms such as quolls, antechinuses, dunnarts, the Tasmanian devil, the numbat, and the recently extinct thylacine), Diprotododontia (possums, gliders, kangaroos, wallabies, rat kangaroos, wombats, koalas, etc.), Notoryctemorphia (marsupial moles), and Peramelemorphia (bandicoots and bilbies).
The current literature on marsupial phylogenetics includes numerous studies based on analyses of morphological data with relatively limited sampling of Recent and fossil taxa, and many studies based on analyses of molecular data that include a dense sampling of Recent taxa, but relatively few that combine both data types. Another dichotomy in the 9 2021) belonging to seven clades that are currently ranked as orders in the Linnean hierarchy (Table 1; Aplin and Archer, 1987;Wilson and Reeder, 2005;Burgin et al., 2018;Eldridge et al., 2019): Didelphimorphia (opossums), Paucituberculata (shrew opossums), Microbiotheria (the "monito del monte" Dromiciops gliroides), Dasyuromorphia (predominantly carnivorous forms such as quolls, antechinuses, dunnarts, the Tasmanian devil, the numbat, and the recently extinct thylacine), Diprotododontia (possums, gliders, kangaroos, wallabies, rat kangaroos, wombats, koalas, etc.), Notoryctemorphia (marsupial moles), and Peramelemorphia (bandicoots and bilbies).
The current literature on marsupial phylogenetics includes numerous studies based on analyses of morphological data with relatively limited sampling of Recent and fossil taxa, and many studies based on analyses of molecular data that include a dense sampling of Recent taxa, but relatively few that combine both data types. Another dichotomy in the marsupial phylogenetic literature is between studies that focus on New World taxa, others that focus on Sahulian taxa. To date, there has been no attempt to assess the phylogenetic relationships of the global marsupial fauna, based on combined analyses of morphology and molecular sequences, for a dense sampling of Recent and fossil taxa. For this report, we compiled morphological and molecular data from an unprecedented number of Recent and fossil marsupials. Our morphological data consist of 180 craniodental characters that we scored for 97 species representing every currently recognized Recent genus, 42 additional ingroup (crown-clade marsupial) taxa represented by well-preserved fossils, and 5 outgroups (non-marsupial metatherians). Our molecular data comprise 24.5 kb of DNA sequences from whole-mitochondrial genomes and six nuclear loci (APOB, BRCA1, GHR, RAG1, RBP3 and VWF) for 97 marsupial terminals (the same Recent taxa scored for craniodental morphology) and several placental and monotreme outgroups. The results of separate and combined analyses of these data using a wide range of phylogenetic methods support many currently accepted hypotheses of ingroup (marsupial) relationships, but they also underscore the difficulty of placing fossils with key missing data (e.g., †Evolestes), and the unique difficulty of placing others that exhibit mosaics of plesiomorphic and autapomorphic traits (e.g., †Yalkaparidon). Unique contributions of our study are (1) critical discussions and illustrations of marsupial craniodental morphology, including descriptions and illustrations of some features never previously coded for phylogenetic analysis; (2) critical assessments of relative support for many suprageneric clades; (3) estimates of divergence times derived from tip-and-node dating based on uniquely taxon-dense analyses; and (4) a revised, higher-order classification of marsupials accompanied by lists of supporting craniodental synapomorphies. Far from the last word on these topics, this report lays the foundation for future research that may be enabled by the discovery of new fossil taxa, better-preserved material of previously described taxa, novel morphological characters, and improved methods of phylogenetic analysis. There has been disagreement for more than 100 years concerning the presence or absence of deciduous and successional third premolars in the dentition of the Australian dasyurid marsupial Dasyurus viverrinus as well as in other species of the genus Dasyurus. Most authors during the 19th and 20th centuries have considered the missing premolar in Dasyurus to be the third premolar family in both jaws, in part because of the reduction in size of the third deciduous premolar in many other genera of dasyurids. While other authors, found “the deciduous premolar to be constantly present in the young mammary foetus as a small and precociously calcified vestigial tooth”. However, the fate of this deciduous tooth, and its possible successor in later developmental stages, was never described; and the vestigial dp3 and its possible successor were assumed to undergo absorption during foetal life. With access to later developmental stages of Dasyurus viverrinus, via the extensive collections of Professor J.P. Hill, we present new evidence for the later development of dP3 and P3 in both jaws, the probable eruption of the successional P3 in both jaws and evidence that dP2 is the missing tooth in both jaws of this dasyurid species. scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health. customersupport@researchsolutions.com 10624 S. Eastern Ave., Ste. A-614 Henderson, NV 89052, USA This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. Copyright © 2024 scite LLC. All rights reserved. Made with 💙 for researchers Part of the Research Solutions Family.Dromiciops gliroides (the sole extant microbiotherian) and the three genera of modern paucituberculatans (Caenolestes, Lestoros, and Rhyncholestes, all members of the family Caenolestidae) are exclusively South American in distribution (Gardner, 2008). Fossil members of both orders are known from South America (
Dromiciops gliroides (the sole extant microbiotherian) and the three genera of modern paucituberculatans (Caenolestes, Lestoros, and Rhyncholestes, all members of the family Caenolestidae) are exclusively South American in distribution (Gardner, 2008). Fossil members of both orders are known from South America (
Initiation and early development of the postcanine deciduous dentition in the dasyurid marsupial Dasyurus viverrinus
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