Two new **Orthoseira** species (Bacillariophyceae) from lava tubes on Île Amsterdam and Big Island (Hawai'i)

Abstract: Two new species of Orthoseira from lava tubes on Île Amsterdam and Big Island (Hawai΄i) are described using light and scanning electron microscopy: Orthoseira johansenii Lowe & Kociolek sp. nov., from Hawaii, and O. verleyenii Van de Vijver sp. nov., from the subantarctic. Both species...

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Published in:Phytotaxa
Main Authors: Lowe, Rex L., Kociolek, J. Patrick, Van de Vijver, Bart
Format: Article in Journal/Newspaper
Language:English
Published: 2013
Subjects:
Online Access:https://hdl.handle.net/10067/1087550151162165141
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spelling ftunivantwerpen:c:irua:108755 2023-07-16T03:59:15+02:00 Two new **Orthoseira** species (Bacillariophyceae) from lava tubes on Île Amsterdam and Big Island (Hawai'i) Lowe, Rex L. Kociolek, J. Patrick Van de Vijver, Bart 2013 https://hdl.handle.net/10067/1087550151162165141 eng eng info:eu-repo/semantics/altIdentifier/doi/10.11646/PHYTOTAXA.111.1.3 info:eu-repo/semantics/altIdentifier/isi/000320394200003 info:eu-repo/semantics/closedAccess 1179-3155 Phytotaxa Biology info:eu-repo/semantics/article 2013 ftunivantwerpen https://doi.org/10.11646/PHYTOTAXA.111.1.3 2023-06-26T22:16:45Z Abstract: Two new species of Orthoseira from lava tubes on Île Amsterdam and Big Island (Hawai΄i) are described using light and scanning electron microscopy: Orthoseira johansenii Lowe & Kociolek sp. nov., from Hawaii, and O. verleyenii Van de Vijver sp. nov., from the subantarctic. Both species have flat valve surfaces, the striae on the mantle are composed of uniseriate areolae and the valve face areolae are small and more or less irregularly scattered, occupying almost 2/3 of the total valve face surface. The areolae in O. johansenii are occluded by an internal velum; no velum was detected in O. verleyenii. In the centre of the valve is a small central hyaline area with 16 carinoportulae in O. verleyenii, 24 in O. johansenii. A distinct ring of marginal linking spines or straight, non-linking spines are present at the valve face/mantle junction. No caverns or internal undulations are present. Internal valves have not been encountered. Both Orthoseira johansenii and O. verleyenii have valves of about the same dimensions. The two species differ in that O. verleyenii shows a rather regular striation pattern near the valve face/mantle junction is noted whereas this is not the case in O. johansenii. Moreover, O. johansenii short slits between the carinoportulae on the internal valve side are absent whereas in O. verleyenii most valves possesses these slits. The two new species are compared with others in this small (ca. 15 species) genus. The biogeographic implications of species separated by 15,000 km are discussed. Article in Journal/Newspaper Île Amsterdam IRUA - Institutional Repository van de Universiteit Antwerpen Lowe ENVELOPE(-30.309,-30.309,-80.537,-80.537) Phytotaxa 111 1 39
institution Open Polar
collection IRUA - Institutional Repository van de Universiteit Antwerpen
op_collection_id ftunivantwerpen
language English
topic Biology
spellingShingle Biology
Lowe, Rex L.
Kociolek, J. Patrick
Van de Vijver, Bart
Two new **Orthoseira** species (Bacillariophyceae) from lava tubes on Île Amsterdam and Big Island (Hawai'i)
topic_facet Biology
description Abstract: Two new species of Orthoseira from lava tubes on Île Amsterdam and Big Island (Hawai΄i) are described using light and scanning electron microscopy: Orthoseira johansenii Lowe & Kociolek sp. nov., from Hawaii, and O. verleyenii Van de Vijver sp. nov., from the subantarctic. Both species have flat valve surfaces, the striae on the mantle are composed of uniseriate areolae and the valve face areolae are small and more or less irregularly scattered, occupying almost 2/3 of the total valve face surface. The areolae in O. johansenii are occluded by an internal velum; no velum was detected in O. verleyenii. In the centre of the valve is a small central hyaline area with 16 carinoportulae in O. verleyenii, 24 in O. johansenii. A distinct ring of marginal linking spines or straight, non-linking spines are present at the valve face/mantle junction. No caverns or internal undulations are present. Internal valves have not been encountered. Both Orthoseira johansenii and O. verleyenii have valves of about the same dimensions. The two species differ in that O. verleyenii shows a rather regular striation pattern near the valve face/mantle junction is noted whereas this is not the case in O. johansenii. Moreover, O. johansenii short slits between the carinoportulae on the internal valve side are absent whereas in O. verleyenii most valves possesses these slits. The two new species are compared with others in this small (ca. 15 species) genus. The biogeographic implications of species separated by 15,000 km are discussed.
format Article in Journal/Newspaper
author Lowe, Rex L.
Kociolek, J. Patrick
Van de Vijver, Bart
author_facet Lowe, Rex L.
Kociolek, J. Patrick
Van de Vijver, Bart
author_sort Lowe, Rex L.
title Two new **Orthoseira** species (Bacillariophyceae) from lava tubes on Île Amsterdam and Big Island (Hawai'i)
title_short Two new **Orthoseira** species (Bacillariophyceae) from lava tubes on Île Amsterdam and Big Island (Hawai'i)
title_full Two new **Orthoseira** species (Bacillariophyceae) from lava tubes on Île Amsterdam and Big Island (Hawai'i)
title_fullStr Two new **Orthoseira** species (Bacillariophyceae) from lava tubes on Île Amsterdam and Big Island (Hawai'i)
title_full_unstemmed Two new **Orthoseira** species (Bacillariophyceae) from lava tubes on Île Amsterdam and Big Island (Hawai'i)
title_sort two new **orthoseira** species (bacillariophyceae) from lava tubes on île amsterdam and big island (hawai'i)
publishDate 2013
url https://hdl.handle.net/10067/1087550151162165141
long_lat ENVELOPE(-30.309,-30.309,-80.537,-80.537)
geographic Lowe
geographic_facet Lowe
genre Île Amsterdam
genre_facet Île Amsterdam
op_source 1179-3155
Phytotaxa
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info:eu-repo/semantics/altIdentifier/isi/000320394200003
op_rights info:eu-repo/semantics/closedAccess
op_doi https://doi.org/10.11646/PHYTOTAXA.111.1.3
container_title Phytotaxa
container_volume 111
container_issue 1
container_start_page 39
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