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Issue: Vol. 402 No. 2: 24 April 2019
Type: Article
Published: 2019-04-24
DOI: 10.11646/phytotaxa.402.2.7
Page range: 126–130
Abstract views: 19
PDF downloaded: 13

Sueria laxinervis, a new fossil species of Cycadales from the Upper Cretaceous Quiriquina Formation in Cocholgüe, Bíobío Region, Chile

Botanical Gardens, Faculty of Science, Osaka City University, Kisaichi, Katano, Osaka 576-0004, Japan
School of Natural System, College of Science and Technology, Kanazawa University, Kanazawa 920-1192, Japan
Fukui Prefectural Dinosaur Museum, Katsuyama, Fukui 911-8601, Japan
Graduate School of Science, Chiba University, Chiba 263-8522, Japan
Department of Geology and Paleontology, National Museum of Nature and Science, Tsukuba, Ibaraki 305-0005, Japan
Department of Biological Sciences, Faculty of Science and Engineering, Chuo University, Tokyo 112-8551, Japan
Department of Geology and Paleontology, National Museum of Nature and Science, Tsukuba, Ibaraki 305-0005, Japan
Instituto Antártico Chileno, Plaza Muñoz Gamero 1055, Punta Arenas, Chile
Laboratorio de Paleoecologia, Facultad de Ciencias, Universidad de Chile, Instituto de Ecología y Biodiversidad, Las Palmeras 3425, Ñuñoa, Santiago CP 780-0024, Chile
Departamento de Botaìnica, Universidad de Concepcioìn, Casilla 160-C, Concepcioìn, Chile
Department of Biological Sciences, Faculty of Science and Engineering, Chuo University, Tokyo 112-8551, Japan
Monocots Cycads Maastrichtian Mesozoic taeniopterid-type leaf

Abstract

A new fossil cycad species, Sueria laxinervis, is described from the Upper Cretaceous (Maastrichtian) Quiriquina Formation in Cocholgüe, Bíobío Region, Chile. The generic assignment is supported by the taeniopterid-type leaf with haplocheilic stomata and sinuate anticlinal walls of leaf epidermal cells, while S. laxinervis clearly differs from the other two described Sueria species in its sparse veins and large epidermal cells. The vascular bundles of the midrib are arranged in an inverted-omega shape, supporting the placement of Sueria in Cycadales.