Microglena Ehrenberg, 1832

Holotype species: Microglena monadina Ehrenberg

Original publication: Ehrenberg, C.G. (1832). Über die Entwickelung und Lebensdauer der Infusionsthiere; nebst ferneren Beiträgen zu einer Vergleichung ihrer organischen Systeme. Abhandlungen der Königlichen Akademie Wissenschaften zu Berlin, Physikalische Klasse 1831: 1-154, pls I-IV.

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Type designated in: Ehrenberg, C.G. (1838). Die Infusionsthierchen als vollkommene Organismen. Ein Blick in das tiefere organische Leben der Natur. pp. i-xviii, [1-4], 1-[548], 64 pls. Leipzig: Verlag von Leopold Voss.

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Description: Unicellular green alga with two equal flagella and a clockwise basal body orientation. Cells ellipsoidal to widely ellipsoid or spherical; cell wall thick; papilla broad, trapezoidal or crown-like. Chloroplast cup-shaped, with or without a thick basal part; pyrenoid variable, from one wide ellipsoidal to elongated quarterhalf- ring- or ring-shaped, or sausage-like body, to Revision of Microglena 281 fragmented into several round pyrenoids; pyrenoid surrounded by many small or several big starch grains oriented in parallel, located in the thick basal part or in lateral thickenings of the chloroplast in basal, medial or upper positions. Stigma bright, ellipsoidal, rod-like or fusiform (sometimes drop- or patch-like) and in an anterior to medial position. Two apical contractile vacuoles. Nucleus central or basal. Asexual reproduction by sporulation into two or four zoospores, cell division with or without rotation of protoplast by 90. Akinetes spherical, with layered smooth cell wall, yellowish. Sexual reproduction by homothallic advanced anisogamy. Macro- and microgametes covered by cell wall. During copulation microgametes attach to macrogametes by the papilla or laterally near the anterior part; both gametes lose their flagella during copulation. Mature zygotes with layered smooth or corrugated cell wall, yellowish.

Information contributed by: Emended description from Demchenko et al. 2012. The most recent alteration to this page was made on 2021-10-18 by M.D. Guiry.

Taxonomic status: This name is of an entity that is currently accepted taxonomically.

Gender: This genus name is currently treated as feminine.

Most recent taxonomic treatment adopted: Demchenko, E, Mikhailyuk, T., Coleman, A.W. & Proschold, T. (2012). Generic and species concepts in Microglena (previously the Chlamydomonas monadina group) revised using an integrative approach. European Journal of Phycology 47(3): 264-290.

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Contributors
Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in CD format. These AlgaeBase descriptions are now being continually updated, and each current contributor is identified above. The PSA and AlgaeBase warmly acknowledge the generosity of all past and present contributors and particularly the work of Dr Parker.

Descriptions of chrysophyte genera were subsequently published in J. Kristiansen & H.R. Preisig (eds.). 2001. Encyclopedia of Chrysophyte Genera. Bibliotheca Phycologica 110: 1-260.

Linking to this page: https://www.algaebase.org/search/genus/detail/?genus_id=44159

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 18 October 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 16 July 2024

 
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