Plant Ecology and Evolution 152(3): 539-545, doi: 10.5091/plecevo.2019.1600
Microcostatus elisabethianus, a new limnoterrestrial diatom species (Bacillariophyta) from the sub-Antarctic region
expand article infoBart Van de Vijver‡, Luc Ector§
‡ Botanic Garden Meise, Meise, Belgium§ Environmental Research & Innovation (ERIN) Department, Luxembourg Institute of Science and Technology (LIST), 4422 Belvaux, Luxembourg

Corresponding author: Bart Van de Vijver ( bart.vandevijver@plantentuinmeise.be )

© Bart Van de Vijver, Luc Ector.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation: Van de Vijver B, Ector L (2019) Microcostatus elisabethianus, a new limnoterrestrial diatom species (Bacillariophyta) from the sub-Antarctic region. Plant Ecology and Evolution 152(3): 539-545. https://doi.org/10.5091/plecevo.2019.1600
Open Access
Abstract

Background and aims – During a survey of the soil diatom flora of the sub-Antarctic islands in the southern Indian Ocean, an unknown small-celled naviculoid taxon was discovered living in small cracks in cliffs bordering the ocean. The taxon showed a set of morphological features only found in the genus Microcostatus. However, the unknown taxon could not be identified using the currently available literature.

Methods – Using both light microscopical and scanning electron microscopical techniques, the morphology of the unknown Microcostatus taxon was documented. The new taxon is described, illustrated and compared with all other similar Microcostatus taxa worldwide.

Key results – Microcostatus elisabethianus possesses a unique combination of morphological features that excludes conspecificity with all other members of the genus. It is characterized by a lanceolate valve outline with protracted, elongate apices, a very large, porous conopeum reaching the valve margins and uniseriate striae composed of only one macroareola and mantle areolae restricted to the valve apices. The morphological features of the genus Microcostatus are evaluated and discussed. Notes on the occurrence and ecology of the new taxon are added.

Keywords
diatoms, sub-Antarctic region, Crozet archipelago, Microcostatus, new species, morphology

References

  • Bory de Saint-Vincent J.B.G.M. (1822) III. Navicule, Navicula. N. In: Bory de Saint-Vincent J.B.G.M. (ed.) Dictionnaire classique d’histoire naturelle: 128. Paris, Rey et Gravier, Baudouin frères. Available at http://biodiversitylibrary.org/page/25672090 [accessed 6 Mar. 2019].
  • Bourrelly P., Manguin E. (1954) Contribution à la flore algale d’eau douce des Iles Kerguelen. Mémoires de l’Institut Scientifique de Madagascar, séries B 5: 7–58.
  • Cantonati M., Van de Vijver B., Lange-Bertalot H. (2009) Microfissurata gen. nov. (Bacillariophyta), a new diatom genus from dystrophic and intermittently wet terrestrial habitats. Journal of Phycology 45(3): 732–741. https://doi.org/10.1111/j.1529-8817.2009.00683.x
  • Germain H. (1937) Diatomées d’une tourbe de l’île Kerguelen. Bulletin de la Société Française de Microscopie 6(1): 11–17, 1 pl.
  • Hustedt F. (1961–1966) Die Kieselalgen Deutschlands, Österreichs und der Schweiz unter Berücksichtigung der übrigen Länder Europas sowie der angrenzenden Meeresgebiete. In: Dr. L. Rabenhorst’s Kryptogamen-Flora von Deutschland, Österreich und der Schweiz Band VII, 3. Teil. Leipzig, Akademische Verlagsgesellschaft.
  • Lange-Bertalot H., Ruppel M., Sabater S. (1990) Conopeum-like structures in Pennate Diatoms. Présence chez les Diatomées Pennées de structures ayant des similitudes avec le conopeum. In: Ricard M. (ed.) Ouvrage dédié à la Mémoire du Professeur Henry Germain (1903–1989): 157–167. Koenigstein, Koeltz Scientific Books.
  • Lebouvier M., Frenot Y. (2007) Conservation and management in the French sub-Antarctic islands and surrounding seas. Papers and Proceedings of the Royal Society of Tasmania 141(1): 23–28. https://doi.org/10.26749/rstpp.141.1.23
  • Le Cohu R., Maillard R. (1983) Les diatomées monoraphidées des îles Kerguelen [The diatoms “monoraphidinae” in the Kerguelen islands]. Annales de Limnologie 19(3): 143–167. https://doi.org/10.1051/limn/1983018
  • Le Cohu R., Maillard R. (1986) Diatomées d’eau douce des îles Kerguelen (à l’exclusion des Monoraphidées) [Freshwater diatoms from Kerguelen Islands (excluding Monoraphideae)]. Annales de Limnologie 22(2): 99–118. https://doi.org/10.1051/limn/1986018
  • Li Y., Suzuki H., Nagumo T., Tanaka J., Sun Z., Xu K. (2016) Microcostatus salinus sp. nov., a new benthic diatom (Bacillariophyceae) from esturarine intertidal sediments, Japan. Phytotaxa 245(1): 51–58. https://doi.org/10.11646/phytotaxa.245.1.5
  • Metzeltin D., Lange-Bertalot H. (2007) Tropical diatoms of South America II. Special remarks on biogeography disjunction. Iconographia Diatomologica 18: 1–877.
  • Ross R., Cox E.J., Karayeva N.I., Mann D.G., Paddock T.B.B., Simonsen R., Sims P.A. (1979) An amended terminology for the siliceous components of the diatom cell. Nova Hedwigia, Beiheft 64: 513–533.
  • Round F.E., Crawford R.M., Mann D.G. (1990) The diatoms: biology & morphology of the genera. Cambridge, Cambridge University Press.
  • Stanek-Tarkowska J., Wetzel C.E., Noga T., Ector L. (2016) Study of the type material of Navicula egregia Hustedt and descriptions of two new aerial Microcostatus (Bacillariophyta) species from Central Europe. Phytotaxa 280(2): 163–172. https://doi.org/10.11646/phytotaxa.280.2.6
  • Taylor J.C., Levanets A., Blanco S., Ector L. (2010) Microcostatus schoemanii sp. nov., M. cholnokyi sp. nov. and M. angloensis sp. nov. three new terrestrial diatoms (Bacillariophyceae) from South Africa. Phycological Research 58(3): 177–187. https://doi.org/10.1111/j.1440-1835.2010.00576.x
  • van der Werff A. (1955) A new method for cleaning and concentrating diatoms and other organisms. Verhandlungen der Internationalen Vereinigung für theoretische und angewandte Limnologie 12(1): 276–277. https://doi.org/10.1080/03680770.1950.11895297
  • Van de Vijver B., Beyens L. (1999) Freshwater diatoms from Ile de la Possession (Crozet Archipelago, sub-Antarctica): an ecological assessment. Polar Biology 22(3): 178–188. https://doi.org/10.1007/s003000050408
  • Van de Vijver B., Frenot Y., Beyens L. (2002a) Freshwater diatoms from Ile de la Possession (Crozet Archipelago, Subantarctica). Bibliotheca Diatomologica 46: 1–412.
  • Van de Vijver B., Ledeganck P., Beyens L. (2002b) Soil diatom communities from Ile de la Possession (Crozet, sub-Antarctica). Polar Biology 25(10): 721–729.
  • Van de Vijver B., Beyens L., Vincke S., Gremmen N.J.M. (2004a) Moss-inhabiting diatom communities from Heard Island, sub-Antarctic. Polar Biology 27(9): 532–543. https://doi.org/10.1007/s00300-004-0629-x
  • Van de Vijver B., Beyens L., Iserentant R. (2004b) Microcostatus zackenbergensis Van de Vijver, Beyens et Iserentant sp. nov. and Microcostatus deslooveri Iserentant et Van de Vijver sp. nov.: two new aerophilic diatoms from Greenland and Papua New Guinea. Nova Hedwigia 78(3–4): 389–397. https://doi.org/10.1127/0029-5035/2004/0078-0389
  • Van de Vijver B., Frenot Y., Beyens L., Lange-Bertalot H. (2005) Labellicula, a new diatom genus (Bacillariophyta) from lIe de la Possession (Crozet Archipelago, Subantarctica). Cryptogamie, Algologie 26(2): 125–133.
  • Van de Vijver B., Gremmen N., Smith V. (2008) Diatom communities from the sub-Antarctic Prince Edward Islands: diversity and distribution patterns. Polar Biology 31(7): 795–808. https://doi.org/10.1007/s00300-008-0418-z
  • Van de Vijver B., Kopalová K., Zidarova R., Cox E.J. (2013) New and interesting small-celled naviculoid diatoms (Bacillariophyta) from the Maritime Antarctic Region. Nova Hedwigia 97
  • Van de Vijver B., Chattová B., Lebouvier M., Houk V. (2017a) Ferocia gen. nov., a new centric diatom genus (Bacillariophyceae) from the sub-Antarctic region. Phytotaxa 332(1): 22–30. https://doi.org/10.11646/phytotaxa.332.1.2
  • Van de Vijver B., Lange-Bertalot H., Wetzel C.E., Ector L. (2017b) Michelcostea, a new diatom genus (Bacillariophyta) from the sub-Antarctic Region. Nova Hedwigia, Beiheft 146: 125–136. https://doi.org/10.1127/1438-9134/2017/125
  • Wetzel C.E., Martínez-Carreras N., Hlúbiková D., Hoffmann L., Pfister L., Ector L. (2013) New combinations and type analysis of Chamaepinnularia species (Bacillariophyceae) from aerial habitats. Cryptogamie, Algologie 34(2): 149–168. https://doi.org/10.7872/crya.v34.iss2.2013.149
  • Wydrzycka Ú, Lange-Bertalot H. (2001) Las diatomeas (Bacillariophyceae) acidófilas del río Agrio y sitios vinculados con su cuenca,volcán Poás, Costa Rica. Brenesia 55–56: 1–68.
  • Zidarova R., Kopalová K., Van de Vijver B. (2016) Diatoms from the Antarctic Region: Maritime Antarctica. Iconographia Diatomologica 24: 1–504.