{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T01:13:25Z","timestamp":1787015605073,"version":"build-2736575974"},"reference-count":181,"publisher":"Wiley","issue":"6","license":[{"start":{"date-parts":[[2017,9,28]],"date-time":"2017-09-28T00:00:00Z","timestamp":1506556800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Journal of Anatomy"],"published-print":{"date-parts":[[2017,12]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    The existing different modes of reproduction in monotremes, marsupials and placentals are the main source for our current understanding of the origin and evolution of the mammalian reproduction. The reproductive strategies and, in particular, the maturity states of the neonates differ remarkably between the three groups. Monotremes, for example, are the only extant mammals that lay eggs and incubate them for the last third of their embryonic development. In contrast, marsupials and placentals are viviparous and rely on intra\u2010uterine development of the neonates via choriovitelline (mainly marsupials) and chorioallantoic (mainly placentals) placentae. The maturity of a newborn is closely linked to the parental care strategy once the neonate is born. The varying developmental degrees of neonates are the main focus of this study. Monotremes and marsupials produce highly altricial and nearly embryonic offspring. Placental mammals always give birth to more developed newborns with the widest range from altricial to precocial. The ability of a newborn to survive and grow in the environment it was born in depends highly on the degree of maturation of vital organs at the time of birth. Here, the anatomy of four neonates of the three major extant mammalian groups is compared. The basis for this study is histological and ultrastructural serial sections of a hatchling of\n                    <jats:italic>Ornithorhynchus anatinus<\/jats:italic>\n                    (Monotremata), and neonates of\n                    <jats:italic>Monodelphis domestica<\/jats:italic>\n                    (Marsupialia),\n                    <jats:italic>Mesocricetus auratus<\/jats:italic>\n                    (altricial Placentalia) and\n                    <jats:italic>Macroscelides proboscideus<\/jats:italic>\n                    (precocial Placentalia). Special attention was given to the developmental stages of the organs skin, lung, liver and kidney, which are considered crucial for the maintenance of vital functions. The state of the organs of newborn monotremes and marsupials are found to be able to support a minimum of vital functions outside the uterus. They are sufficient to survive, but without capacities for additional energetic challenges. The organs of the altricial placental neonate are further developed, able to support the maintenance of vital functions and short\u2010term metabolic increase. The precocial placental newborn shows the most advanced state of organ development, to allow the maintenance of vital functions, stable thermoregulation and high energetic performance. The ancestral condition of a mammalian neonate is interpreted to be similar to the state of organ development found in the newborns of marsupials and monotremes. In comparison, the newborns of altricial and precocial placentals are derived from the ancestral state to a more mature developmental degree associated with advanced organ systems.\n                  <\/jats:p>","DOI":"10.1111\/joa.12689","type":"journal-article","created":{"date-parts":[[2017,9,28]],"date-time":"2017-09-28T11:52:04Z","timestamp":1506599524000},"page":"798-822","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":57,"title":["Comparative anatomy of neonates of the three major mammalian groups (monotremes, marsupials, placentals) and implications for the ancestral mammalian neonate morphotype"],"prefix":"10.1111","volume":"231","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9646-9759","authenticated-orcid":false,"given":"Kirsten","family":"Ferner","sequence":"first","affiliation":[{"name":"Leibniz\u2010Institut f\u00fcr Evolutions\u2010 und Biodiversit\u00e4tsforschung Museum f\u00fcr Naturkunde Berlin Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Julia A.","family":"Schultz","sequence":"additional","affiliation":[{"name":"Department of Organismal Biology and Anatomy University of Chicago Chicago IL USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ulrich","family":"Zeller","sequence":"additional","affiliation":[{"name":"Lebenswissenschaftliche Fakult\u00e4t FG Spezielle Zoologie Albrecht Daniel Thaer\u2010Institut f\u00fcr Agrar\u2010 und Gartenbauwissenschaften Humboldt\u2010Universit\u00e4t zu Berlin Berlin Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2017,9,28]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1113\/jphysiol.1969.sp008809"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1093\/oxfordjournals.bmb.a071243"},{"key":"e_1_2_6_4_1","first-page":"131","article-title":"Postnatal growth of the mouse lung","volume":"124","author":"Amy RWM","year":"1977","journal-title":"J Anat"},{"key":"e_1_2_6_5_1","doi-asserted-by":"publisher","DOI":"10.1272\/jnms.71.360"},{"key":"e_1_2_6_6_1","doi-asserted-by":"publisher","DOI":"10.1159\/000144418"},{"key":"e_1_2_6_7_1","doi-asserted-by":"publisher","DOI":"10.1134\/S0031030106060098"},{"key":"e_1_2_6_8_1","doi-asserted-by":"publisher","DOI":"10.1071\/RD9960989"},{"key":"e_1_2_6_9_1","doi-asserted-by":"publisher","DOI":"10.1002\/ar.21242"},{"key":"e_1_2_6_10_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-642-88402-3_10"},{"key":"e_1_2_6_11_1","doi-asserted-by":"crossref","first-page":"35","DOI":"10.1093\/oso\/9780199535033.003.0004","volume-title":"The Timetree of Life","author":"Benton M","year":"2009"},{"key":"e_1_2_6_12_1","first-page":"1223","volume-title":"Rudolph's Pediatrics. 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