Evolution of Placentation in Eugongylini (Squamata: Scincidae): Ontogeny of Extraembryonic Membranes in Oviparous and Viviparous Species of New Zealand

IF 1.5 4区 医学 Q2 ANATOMY & MORPHOLOGY
James R. Stewart, Kelly M. Hare, Michael B. Thompson
{"title":"Evolution of Placentation in Eugongylini (Squamata: Scincidae): Ontogeny of Extraembryonic Membranes in Oviparous and Viviparous Species of New Zealand","authors":"James R. Stewart,&nbsp;Kelly M. Hare,&nbsp;Michael B. Thompson","doi":"10.1002/jmor.70001","DOIUrl":null,"url":null,"abstract":"<div>\n \n <p>New Zealand scincid lizards, genus <i>Oligosoma</i>, represent a monophyletic radiation of a clade, Eugongylini, of species distributed geographically throughout the South Pacific with major radiations in Australia and New Caledonia. Viviparity has evolved independently on multiple occasions within these lineages. Studies of Australian species have revealed that placental specializations resulting in substantial placentotrophy have evolved in two lineages. The pattern of extraembryonic membrane development of oviparous species differs from viviparous species and identical placental architecture has evolved in both placentotrophic lineages. We analyzed extraembryonic membrane development in two New Zealand species, the sole oviparous species, <i>Oligosoma suteri</i>, and placental development of a representative viviparous species, <i>Oligosoma polychroma</i>, using histological techniques. We conclude that these two species share a basic pattern of extraembryonic membrane development with other squamates. Comparisons with Australian species indicate that morphogenesis of the yolk sac of <i>O. suteri</i> results in an elaborate structure previously known only in <i>Oligosoma lichenigerum</i> with a geographic distribution on Lord Howe Island and Norfolk Island. This finding supports a close relationship between these two taxa. We conclude also that the pattern of placental development of <i>O. polychroma</i> is identical to that of viviparous species of Australia. The terminal placental stage for each of these lineages includes a chorioallantoic placenta and an elaborate omphaloplacenta. This level of homoplasy in placental evolution is consistent with a hypothesis that selection favors regional differentiation of the maternal–embryonic interface and that the omphaloplacenta is an adaptation for histotrophic transport.</p></div>","PeriodicalId":16528,"journal":{"name":"Journal of Morphology","volume":null,"pages":null},"PeriodicalIF":1.5000,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Morphology","FirstCategoryId":"3","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/jmor.70001","RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ANATOMY & MORPHOLOGY","Score":null,"Total":0}
引用次数: 0

Abstract

New Zealand scincid lizards, genus Oligosoma, represent a monophyletic radiation of a clade, Eugongylini, of species distributed geographically throughout the South Pacific with major radiations in Australia and New Caledonia. Viviparity has evolved independently on multiple occasions within these lineages. Studies of Australian species have revealed that placental specializations resulting in substantial placentotrophy have evolved in two lineages. The pattern of extraembryonic membrane development of oviparous species differs from viviparous species and identical placental architecture has evolved in both placentotrophic lineages. We analyzed extraembryonic membrane development in two New Zealand species, the sole oviparous species, Oligosoma suteri, and placental development of a representative viviparous species, Oligosoma polychroma, using histological techniques. We conclude that these two species share a basic pattern of extraembryonic membrane development with other squamates. Comparisons with Australian species indicate that morphogenesis of the yolk sac of O. suteri results in an elaborate structure previously known only in Oligosoma lichenigerum with a geographic distribution on Lord Howe Island and Norfolk Island. This finding supports a close relationship between these two taxa. We conclude also that the pattern of placental development of O. polychroma is identical to that of viviparous species of Australia. The terminal placental stage for each of these lineages includes a chorioallantoic placenta and an elaborate omphaloplacenta. This level of homoplasy in placental evolution is consistent with a hypothesis that selection favors regional differentiation of the maternal–embryonic interface and that the omphaloplacenta is an adaptation for histotrophic transport.

Eugongylini(有鳞目:蝎科)胎盘的进化:新西兰卵生和胎生物种胚外膜的本体发育
新西兰鳞蜥属(Oligosoma)是一个支系(Eugongylini)的单系辐射,该支系的物种地理分布在整个南太平洋,主要分布在澳大利亚和新喀里多尼亚。在这些支系中,胎生性多次独立进化。对澳大利亚物种的研究表明,胎盘特化导致大量胎盘营养在两个品系中进化。卵胎生物种的胚胎外膜发育模式不同于胎生物种,而在这两个胎盘营养系中都进化出了相同的胎盘结构。我们利用组织学技术分析了两个新西兰物种(唯一的卵胎生物种Oligosoma suteri)的胚外膜发育情况,以及代表性胎生物种Oligosoma polychroma的胎盘发育情况。我们的结论是,这两个物种与其他有鳞类动物具有相同的胚外膜发育基本模式。与澳大利亚物种的比较结果表明,O. suteri卵黄囊的形态发生产生了一种复杂的结构,这种结构以前只在Oligosoma lichenigerum中出现过,地理分布在豪勋爵岛和诺福克岛。这一发现支持了这两个类群之间的密切关系。我们还得出结论,O. polychroma 的胎盘发育模式与澳大利亚胎生物种的胎盘发育模式相同。这两个类群的胎盘末期都包括一个绒毛膜胎盘和一个复杂的卵母细胞胎盘。胎盘进化过程中的这种同源性与一种假说是一致的,这种假说认为选择有利于母体-胚胎界面的区域分化,而脑胎盘则是对组织运输的一种适应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
Journal of Morphology
Journal of Morphology 医学-解剖学与形态学
CiteScore
2.80
自引率
6.70%
发文量
119
审稿时长
1 months
期刊介绍: The Journal of Morphology welcomes articles of original research in cytology, protozoology, embryology, and general morphology. Articles generally should not exceed 35 printed pages. Preliminary notices or articles of a purely descriptive morphological or taxonomic nature are not included. No paper which has already been published will be accepted, nor will simultaneous publications elsewhere be allowed. The Journal of Morphology publishes research in functional, comparative, evolutionary and developmental morphology from vertebrates and invertebrates. Human and veterinary anatomy or paleontology are considered when an explicit connection to neontological animal morphology is presented, and the paper contains relevant information for the community of animal morphologists. Based on our long tradition, we continue to seek publishing the best papers in animal morphology.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信