{"title":"Petalophyllites speirsiae gen. et sp. nov. (Marchantiophyta: Fossombroniales), a fossil liverwort gametophyte from the Paleocene of Alberta, Canada","authors":"Georgia L. Hoffman, Barbara J. Crandall-Stotler","doi":"10.1139/cjb-2023-0057","DOIUrl":null,"url":null,"abstract":"Botany, Volume 101, Issue 10, Page 462-470, October 2023. <br/> Although liverworts (Marchantiophyta) are postulated to be one of the oldest lineages of land plants, their documented fossil record is sparse. This study describes five new fossil liverwort gametophytes, one of which bears antheridia, from the Paleocene Paskapoo Formation of Alberta, Canada. The thalli are bilaterally symmetrical, with two undissected wings that bear oppositely arranged dorsal lamellae. One specimen is dichotomously branched, and one bears clusters of antheridia along the midrib area of its dorsal surface. These characters are consistent with those of extant Petalophyllum Nees & Gottsche ex Lehm. (Fossombroniales: Petalophyllaceae), and the genus Petalophyllites gen. nov. (Fossombroniales: Petalophyllaceae) is here erected for these fossils. They are the first representatives of Petalophyllaceae and the Fossombroniales from the fossil record. Most of the specimens are in growth position. Their geologic setting and associated fossils indicate that Petalophyllites lived at the margin of a lake or pond in a habitat that may have been intermittently dry, as is also common in extant species of Petalophyllum. The well-preserved thalli and antheridia of these fossils, and their well-documented middle Paleocene age, provide new evidence of liverwort diversification at the dawn of the Cenozoic Era.","PeriodicalId":9092,"journal":{"name":"Botany","volume":null,"pages":null},"PeriodicalIF":1.0000,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Botany","FirstCategoryId":"99","ListUrlMain":"https://doi.org/10.1139/cjb-2023-0057","RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"PLANT SCIENCES","Score":null,"Total":0}
引用次数: 0
Abstract
Botany, Volume 101, Issue 10, Page 462-470, October 2023. Although liverworts (Marchantiophyta) are postulated to be one of the oldest lineages of land plants, their documented fossil record is sparse. This study describes five new fossil liverwort gametophytes, one of which bears antheridia, from the Paleocene Paskapoo Formation of Alberta, Canada. The thalli are bilaterally symmetrical, with two undissected wings that bear oppositely arranged dorsal lamellae. One specimen is dichotomously branched, and one bears clusters of antheridia along the midrib area of its dorsal surface. These characters are consistent with those of extant Petalophyllum Nees & Gottsche ex Lehm. (Fossombroniales: Petalophyllaceae), and the genus Petalophyllites gen. nov. (Fossombroniales: Petalophyllaceae) is here erected for these fossils. They are the first representatives of Petalophyllaceae and the Fossombroniales from the fossil record. Most of the specimens are in growth position. Their geologic setting and associated fossils indicate that Petalophyllites lived at the margin of a lake or pond in a habitat that may have been intermittently dry, as is also common in extant species of Petalophyllum. The well-preserved thalli and antheridia of these fossils, and their well-documented middle Paleocene age, provide new evidence of liverwort diversification at the dawn of the Cenozoic Era.
Petalophyllites specisiae gen. et sp. 11 . (marchantiophysia: Fossombroniales),加拿大阿尔伯塔省古新世苔类配子体化石
植物学,第101卷,第10期,第462-470页,2023年10月。尽管地茅(Marchantiophyta)被认为是最古老的陆地植物谱系之一,但它们的化石记录却很少。本文描述了加拿大阿尔伯塔省古新世Paskapoo组的5个新苔类配子体化石,其中1个带有卵头。菌体两侧对称,有两个未解剖的翅膀,背片相反排列。一个标本是二分叉的,一个沿着其背表面的中脉区域有簇生的肛门。这些特征与现存叶叶属植物的特征一致。Gottsche ex Lehm。(Fossombroniales: Petalophyllaceae),此处为这些化石建立了Petalophyllites gen. 11 . (Fossombroniales: Petalophyllaceae)属。它们是化石记录中最早出现的叶藻科和Fossombroniales的代表。大部分标本处于生长位置。它们的地质环境和相关化石表明,瓣叶植物生活在湖泊或池塘的边缘,栖息地可能是间歇性干燥的,这在现存的瓣叶植物物种中也很常见。这些化石中保存完好的菌体和肛门体,以及它们在古新世中期的良好记录,为新生代初期的苔类多样化提供了新的证据。
期刊介绍:
Botany features comprehensive research articles and notes in all segments of plant sciences, including cell and molecular biology, ecology, mycology and plant-microbe interactions, phycology, physiology and biochemistry, structure and development, genetics, systematics, and phytogeography. It also publishes methods, commentary, and review articles on topics of current interest, contributed by internationally recognized scientists.