The genus Craspedostauros E.J.Cox (Bacillariophyta) on the coasts of Livingston Island, Maritime Antarctica

RALITSA ZIDAROVA; MYRIAM DE HAAN; PLAMEN IVANOV; ELITSA HINEVA; BART VAN DE VIJVER

doi:10.11646/phytotaxa.572.1.1

Issue: Vol. 572 No. 1: 8 November 2022

Type: Article

Published: 2022-11-08

DOI: 10.11646/phytotaxa.572.1.1

Page range: 1-24

Abstract views: 60

PDF downloaded: 3

**The genus Craspedostauros E.J.Cox (Bacillariophyta) on the coasts of Livingston Island, Maritime Antarctica**

RALITSA ZIDAROVA⁺⁻
MYRIAM DE HAAN⁺⁻
PLAMEN IVANOV⁺⁻
ELITSA HINEVA⁺⁻
BART VAN DE VIJVER⁺⁻

Institute of Oceanology at the Bulgarian Academy of Sciences, 40 Parvi May Str., 9000 Varna, Bulgaria

Meise Botanic Garden, Research Department, Nieuwelaan 38, 1860 Meise, Belgium

Institute of Biodiversity and Ecosystem Research at the Bulgarian Academy of Sciences, 2 Mayor Yurii Gagarin Str., 1113 Sofia, Bulgaria

Institute of Oceanology at the Bulgarian Academy of Sciences, 40 Parvi May Str., 9000 Varna, Bulgaria

Meise Botanic Garden, Research Department, Nieuwelaan 38, 1860 Meise, Belgium; University of Antwerp, Department of Biology – ECOSPHERE, Universiteitsplein 1, B-2610 Wilrijk, Belgium

Antarctic Region diatoms marine benthos South Shetland Islands taxonomy Algae

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Abstract

During a survey of diatoms present in tidal pools on the coasts of Livingston Island (South Shetland Islands), we found several populations, belonging presumably to the Antarctic endemic Craspedostauros laevissimus. Further analyses using light microscopy revealed that the populations show differences in stria density. Following scanning electron microscopy observations, only part of the investigated populations could be assigned to C. laevissimus, whereas the others are sufficiently morphologically different based on stria density and their cribrate areolae structure to be described as a new species: Craspedostauros confusus sp. nov. The new taxon is compared with known, morphologically similar, Craspedostauros taxa. The paper presents morphological and ecological data for both taxa discussed in the study. A detailed survey of the early Antarctic literature showed that the Craspedostauros taxa in Antarctica have convoluted taxonomic histories and that the new taxon has likely been hidden for long within the variability of C. laevissimus.

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