University of Oulu

Santiañez, W., Macaya, E., Lee, K., Cho, G., Boo, S., Kogame, K. (2018) Taxonomic reassessment of the Indo-Pacific Scytosiphonaceae (Phaeophyceae): Hydroclathrus rapanuii sp. nov. and Chnoospora minima from Easter Island, with proposal of Dactylosiphon gen. nov. and Pseudochnoospora gen. nov.. Botanica Marina, 61 (1), . doi:10.1515/bot-2017-0089

Taxonomic reassessment of the Indo-Pacific Scytosiphonaceae (Phaeophyceae) : Hydroclathrus rapanuii sp. nov. and Chnoospora minima from Easter Island, with proposal of Dactylosiphon gen. nov. and Pseudochnoospora gen. nov.

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Author: Santiañez, Wilfred John E.1; Macaya, Erasmo C.2,3; Lee, Kyung Min4;
Organizations: 1Department of Natural History Sciences, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
2Laboratorio de Estudios Algales (ALGALAB), Departamento de Oceanografía, Casilla 160-C, Universidad de Concepción, Concepción, Chile
3Millennium Nucleus: Ecology and Sustainable Management of Oceanic Island (ESMOI), Coquimbo, Chile
4Department of Ecology and Genetics, University of Oulu, Oulu 90014, Finland
5National Institute of Biological Resources, Incheon 22689, South Korea
6Department of Biology, Chungnam National University, Daejeon 305-764, South Korea
7Department of Biological Sciences, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan
Format: article
Version: published version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe201803135969
Language: English
Published: De Gruyter, 2018
Publish Date: 2019-01-10
Description:

Abstract

A new and putatively endemic species of Hydroclathrus, Hydroclathrus rapanuii, is described from the geographically isolated Easter Island in the southeastern Pacific based on morphological and molecular phylogenetic data. It is distinguished from other Hydroclathrus by thalli of unevenly furrowed thin membranes, and angular, block-like plurangial sori. Our phylogenetic analyses indicated that H. rapanuii is closely related to the generitype Hydroclathrus clathratus. We also report on the morphology and phylogeny of Chnoospora minima from Easter I. and elsewhere in the Indo-Pacific Ocean, noting the previously unreported presence of hollow portions in its medulla. Although not collected from Easter I., we herein propose the recognition of two new genera, Dactylosiphon gen. nov. and Pseudochnoospora gen. nov., based on our three-gene phylogeny and their known morphologies and anatomies. Dactylosiphon is based on the three species currently assigned to Colpomenia (C. bullosa, C. durvillei, and C. wynnei) that are genetically and morphologically (i.e. thalli with erect and finger-like tubes arising from a common saccate base) distinct from other members of Colpomenia. The monotypic genus Pseudochnoospora is represented by the decumbent, branching, and interadhesive species currently known as Chnoospora implexa. With the above proposals, we further increase the genus-level diversity of Scytosiphonaceae in the Indo-Pacific Ocean.

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Series: Botanica marina
ISSN: 0006-8055
ISSN-E: 1437-4323
ISSN-L: 0006-8055
Volume: 61
Issue: 1
Pages: 47 - 64
DOI: 10.1515/bot-2017-0089
OADOI: https://oadoi.org/10.1515/bot-2017-0089
Type of Publication: A1 Journal article – refereed
Field of Science: 1181 Ecology, evolutionary biology
Subjects:
Funding: WJES is funded by the Ministry of Education, Japan (MEXT) under the Monbukagakusho Scholarship Grant. ECM is funded by the Chilean Millennium Initiative (NC120030) grant.
Copyright information: ©2018 Walter de Gruyter GmbH, Berlin/Boston.