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DOI: http://dx.doi.org/10.11646/phytotaxa.245.1.1

A phylogenetic re-definition of the diatom genus Bacterosira (Thalassiosirales, Bacillariophyta), with the transfer of Thalassiosira constricta based on morphological and molecular characters

Joon Sang Park, Andrew J Alverson, Jin Hwan Lee

Abstract


Thalassiosira constricta was first described from Tromsø in the Norwegian Sea. The species was placed in the large and morphologically diverse genus Thalassiosira based on the presence of classical features of that genus, including the formation of chains held together by β-chitin threads extruded from central fultoportulae. We recently discovered T. constricta in Korean coastal waters near Sinsi Island. Detailed morphological analyses revealed the following cell wall features: i) cells arranged in chains, with adjacent cells directly abutting one another or distinctly separated and linked by β-chitin threads extruded from a central cluster of 0–14 fultoportulae, ii) delicate, biseriate poroid areolae along radial ribs on the valve face and coarse loculate areolae on the valve mantle, iii) a cingulum structure consisting of finely perforated valvocoupla and copula and scratched pleurae, iv) distinct antiligula on the valve, v) a single ring of marginal fultoportulae, vi) one rimoportula located within the ring of marginal fultoportulae, vii) fultoportulae with internal extensions that lack opercula, and viii) fultoportulate with four fully exposed satellite pores, each in a depression and surrounded by a defined cowling. Phylogenetic analysis of nuclear and plastid markers revealed a sister relationship with Bacterosira bathyomphala. Based on these findings, we transfer T. constricta to Bacterosira as Bacterosira constricta comb. nov. and offer an emended the description of the genus Bacterosira, which appears to be one of only a few monophyletic marine genera in Thalassiosirales.


Keywords


Bacterosira, colonial diatoms, Thalassiosira constricta, Thalassiosirales, Algae

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References


Alverson A.J., Jansen, R.K. & Theriot, E.C. (2007) Bridging the Rubicon: Phylogenetic analysis reveals repeated colonizations of marine and fresh waters by thalassiosiroid diatoms. Molecular Phylogenetics and Evolution 45:193–210.

http://dx.doi.org/10.1016/j.ympev.2007.03.024

Cleve, P.T. (1873) Examination of diatoms found on the surface of the Sea of Java. Bihang till Kongliga Svenska Vetenskaps-Akademiens Handlingar 1: 1–13.

Cleve, P.T. (1883) Diatoms, Collected during the expedition of the Vega. Vega-Expedition Vetenskåpliga Iakttagelser 3: 457–517.

http://dx.doi.org/10.5962/bhl.title.68742

Cleve, P.T. (1896) Redogörelse för de svenska hydrografiska undersökningarne februari 1896. V. Planktonundersökningar: Vegetabilskt plankton. Bihang till Kungliga Svenska Vetenskapsakademiens Handlingar 22: 1–33.

Cleve, P.T. & Grunow, A. (1880) Beiträge zur Kenntniss der Arctischen Diatomeen. Kongliga Svenska Vetenskaps-Akademiens Handlingar 17: 1–121.

Comber, T. (1896) On the occurrence of endocysts in the genus Thalassiosira. Journal of the Royal Microscopical Society, series 3 1896: 489–491.

http://dx.doi.org/10.1111/j.1365-2818.1896.tb00910.x

De Toni, G.B. (1894) Sylloge algarum omnium hucusque cognitarum. Vol. II. Sect. III. Sumptibus auctoris, Patavii, pp. 819–1556.

Fourtanier, E. & Kociolek, J.P. (2009) Catalogue of diatom names. Part II. Abas through Bruniopsis. Occasional papers of the California Academy of Sciences 156: 1–231.

Fryxell, G.A. & Hasle, G.R. (1979a) The genus Thalassiosira: T. trifulta sp. nova and other species with tricolumnar supports on strutted processes. Beihefte zur Nova Hedwigia 64: 13–40.

Fryxell, G.A. & Hasle, G.R. (1979b) The genus Thalassiosira: species with internal extensions of the strutted processes. Phycologia 18: 378–393.

http://dx.doi.org/10.2216/i0031-8884-18-4-378.1

Fryxell, G.A., Hubbard, G.F. & Villareal, T.A. (1981) The genus Thalassioisra: variations of the cingulum. Bacillaria 4: 41–63.

Garrder, K.R. (1938) Phytoplankoton studies from the Tromsø district 1930–31. Tromsø Museums Arshefter, Naturhistorisk Avdeling 11: 1–59.

Gran, H.H. (1897) Bacillariaceen vom Kleinen Karajakfjord. Bibliotheca Botanica 42: 1–24.

Gran, H.H. (1900) Bemerkungen über einige planktondiatomeen. Nyt Magazin for Naturvidenskaberne 38: 103–128.

Greville, R.K. (1865) Descriptions of new and rare diatoms. Series XVI. Transactions of the Microscopical Society of London New Series 13: 43–57.

http://dx.doi.org/10.1111/j.1365-2818.1865.tb05045.x

Harris, A.S.D., Medlin, L.K., Lewis, J. & Jones, J. (1995) Thalassiosira species (Bacillariophyceae) from a Scottish sea-loch. European Journal of Phycology 30: 117–131.

http://dx.doi.org/10.1080/09670269500650881

Hasle, G.R. (1968) The valve processes of the centric diatom genus Thalassiosira. Nytt Magasin for Botanikk 15: 193–201.

Hasle, G.R. (1973) Some marine plankton genera of the diatom family Thalassiosiraceae. Beihft zur Nova Hedwigia 45: 1–49.

Hasle, G.R. (1978) Some Thalassiosira species with one central process. Norwegian Journal of Botany 25: 77–110.

Hasle, G.R. & Syvertsen, E.E. (1993) New nomenclatural combinations of marine planktonic diatoms. The familes Thalassiosiraceae and Rhaphoneidaceae. Beihft zur Nova Hedwigia 106: 297–314.

Hasle, G.R. & Syversten, E.E. (1996) Marine diatoms. In: Tomas, C.R. (Ed.) Identifying marine diatoms and dinoflagellates. Academic Press, San Diego, pp. 5–386.

http://dx.doi.org/10.1016/B978-012693015-3/50005-X

Heimdal, B.R. (1971) Vegetative cells and resting spores of Thalassiosira constricta Gaarder (Bacillariophyceae). Norwegian Journal of Botany 18: 153–159.

Heimdal, B.R. (1974) Further observations on the resting spores of Thalassiosira constricta Gaarder (Bacillariophyceae). Norwegian Journal of Botany 21: 303–307.

Hoppenrath, M., Beszteri, B., Drebes, G., Halliger, H., Beusekom, J.E.E.V., Janisch, S. & Wiltshire, K.H. (2007) Thalassiosira species (Bacillariophyceae, Thalassiosirales) in the North Sea at Helgoland (German Bight) and Sylt (North Frisian Wadden Sea) – a first approach to assessing diversity. European Journal of Phycology 42: 271–288.

http://dx.doi.org/10.1080/09670260701352288

Kaczmarska, I., Beaton, M., Benoit, A.C. & Medlin, L.K. (2006) Molecular phylogeny of selected members of the order Thalassiosirales (Bacillariophyta) and evolution of the fultoportula. Journal of Phycology 42: 121–138.

http://dx.doi.org/10.1111/j.1529-8817.2006.00161.x

Lange, C.B., Hasle, G.R. & Syvertsen, E.E. (1992) Seasonal cycle of diatoms in the Skagerrak, North Atlantic, with emphasis on the period 1980–1990. Sarsia 77: 173–187.

http://dx.doi.org/10.1080/00364827.1992.10413503

Luddington, I. A., Kaczmarska, I. & Lovejoy, C. (2012) Distance and Character-Based Evaluation of the V4 Region of the 18S rRNA Gene for the Identification of Diatoms (Bacillariophyceae). PLoS ONE 7: e45664.

http://dx.doi.org/10.1371/journal.pone.0045664

Park, J.S. & Lee, J.H. (2014) Description of the pseudocryptic species Conticribra weissflogiopsis sp. nov. (Thalassiosirales, Bacillariophyta) isolated from brackish waters in Korea, based on its cingulum structure and molecular analysis. Phytotaxa 191 (1): 115–128.

http://dx.doi.org/10.11646/phytotaxa.191.1.7

Park, J.S. & Lee, J.H. (2015) A new gelatinous colony-forming Thalassiosira minicosmica sp. nov. (Bacillariophyta) from Korean coastal waters and a consideration of the Thalassiosira subtilis group. Diatom Research 30: 163–173.

http://dx.doi.org/10.1080/0269249X.2014.993338

Round, F.E., Crawford, R.M. & Mann, D.G. (1990) The diatoms: biology and morphology of the genera. Cambridge University Press, Cambridge, 747 pp.

Round, F.E. (1972) Some observations on colonies and ultrastructure of the frustule of Coenobiodiscus muriformis and its transfer to Planktoniella. Journal of Phycology 8: 222–231.

http://dx.doi.org/10.1111/j.1529-8817.1972.tb04032.x

Schütt, F. (1892) Das Pflanzenleben der Hochsee. Ergebnisse der Plankton-Expedition der Humboldt-Stiftung 1A: 243–314.

http://dx.doi.org/10.1093/bioinformatics/btu033

Smayda, T.J. & Boleyn, B.J. (1965) Experimental observations on the flotation of marine ditoms. I. Thalassiosira cf. nana, Thalassiosira rotula and Nitzschia seriata. Limnology and Oceanography 10: 499–509.

http://dx.doi.org/10.4319/lo.1965.10.4.0499

Stamatakis, A. (2014) RAxML Version 8: A tool for Phylogenetic Analysis and Post-Analysis of Large Phylogenies. Bioinformatics 30: 1312–1313.

von Stosch, H. (1975) An amended terminology of the diatom girdle. Beihft zur Nova Hedwigia 53: 1–35.

Theriot, E.C. & Serieyssol, K. (1994) Phylogenetic systematics as a guide to understanding features and potential morphological characters of the centric diatom family Thalassiosiraceae. Diatom Research 9: 429–450.

http://dx.doi.org/10.1080/0269249X.1994.9705318

de Vargas, C., Audic, S., Henry, N., Decelle, J., Mahé, F., Logares, R., Lara, E., Berney, C., Le Bescot, N., Probert, I., Carmichael, M., Poulain, J., Romac, S., Colin, S., Aury, J.-M., Bittner, L., Chaffron, S., Dunthorn, M., Engelen, S., Flegontova, O., Guidi, L., Horák, A., Jaillon, O., Lima-Mendez, G., Lukeš, J., Malviya, S., Morard, R., Mulot, M., Scalco, E., Siano, R., Vincent, F., Zingone, A., Dimier, C., Picheral, M., Searson, S., Kandels-Lewis, S., Coordinators, T. O., Acinas, S. G., Bork, P., Bowler, C., Gorsky, G., Grimsley, N., Hingamp, P., Iudicone, D., Not, F., Ogata, H., Pesant, S., Raes, J., Sieracki, M. E., Speich, S., Stemmann, L., Sunagawa, S., Weissenbach, J., Wincker, P. & Karsenti, E. (2015) Eukaryotic plankton diversity in the sunlit ocean. Science 348.

http://dx.doi.org/10.1126/science.1261605

Verity, P.G. (1986) Growth rates of natural tintinnid populations in Narragansett Bay. Marine Ecology Progress Series 29: 117–126.

http://dx.doi.org/10.3354/meps029117


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