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Zygospore morphology in the conjugating green alga Spirotaenia diplohelica (Streptophyta, Zygnematophyceae, Mesotaeniaceae)



The zygospore of the saccoderm desmid Spirotaenia diplohelica is described for the first time. The spore is most peculiar, for surrounded by a series of transparent, conical projections. In that feature it very much resembles the zygospore of Spirotaenia truncata. Contrary to Spirotaenia condensata and Spirotaenia obscura, no twin zygospores are produced and walls of empty gametangial cells do not solve in an early stage but tend to stick to the zygospore for some time. In view of those essentially different modes of sexual reproduction it is not to be excluded that species in the traditional genus Spirotaenia belong to different phylogenetic cladess.


Streptophyta, Zygnematophyceae, Mesotaeniaceae, Algae

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Archer, W. (1862) Description of a new species of Cosmarium (Corda), of Staurastrum (Meyen), of two new species of Closterium (Nitzsch), and of Spirotaenia (Bréb.). Quarterly Journal of Microscopical Science, new series 2: 247254.

Archer, W. (1867) On the conjugation of Spirotaenia condensata (Bré.) and of Spirotaenia truncata (Arch.). Quarterly Journal of Microscopical Science, new series 7: 186193.

Brook, A.J. & Williamson, D.B. (2010) A Monograph on some British Desmids. Ray Society, London, 364 pp.

Coesel, P.F.M. (1981) Spirotaenia diplohelica spec. nov. (Chlorophyta, Mesotaeniaceae). Acta Botanica Neerlandica 30: 433437.

Coesel, P.F.M. & Meesters, J. (2007) Desmids of the Lowlands. KNNV Publishing, Zeist, 351 pp.

Gontcharov, A.A. (2008) Phylogeny and classification of Zygnematophyceae (Streptophyta): current state of affairs. Fottea 8: 87104.

Gontcharov, A.A. & Melkonian, M. (2004) Unusual position of the genus Spirotaenia (Zygnematophyceae) among streptophytes revealed by SSU rDNA and rbcL sequence comparisons. Phycologia 43: 105113.

Guiry, M.D. (2013) Taxonomy and nomenlature of the Conjugatophyceae (= Zygnematophyceae). Algae 28: 129.

Haga, M. & Ehara, J. (1977) Observations on vegetative cells and the process of sexual reproduction in Spirotaenia obscura Ralfs (Mesotaeniaceae, Zygnematales). Bulletin of the Japanese Society of Phycology 25 (Suppl.): 4554.

Hoshaw, R.W. & Hilton, R.L. (1966) Observations on the sexual cycle of the saccoderm desmid Spirotaenia condensata. Journal of the Arizona Academy of Science 4: 8892.

Krieger, W. (1937) Die Desmidiaceen Europas mit Berücksichtigung der aussereuropäischen Arten. Akademische Verlagsgesellschaft M.B.H., Leipzig, 712 pp.

Lenzenweger, R. (1988) Zygotenbildung bei der Zieralge Spirotaenia obscura. Mikrokosmos 77: 5456.

Mollenhauer, D. (1986) Contributions towards a revision of the genus Spirotaenia (Mesotaeniaceae). Beihefte zur Nova Hedwigia 56: 6190.

West, W. & West, G.S. (1904) A Monograph of the British Desmidiaceae, Vol. 1. The Ray Society, London, 224 pp.


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ISSN 1179-3155 (print); ISSN 1179-3163 (online)

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