Vitreochlamys Batko, 1970: 415

Classification:
Empire Eukaryota
Kingdom Plantae
Subkingdom Viridaeplantae
Phylum Chlorophyta
Class Chlorophyceae
Order Volvocales
Family Chlamydomonadaceae

• Taxonomy
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Taxonomic status: currently recognized as a distinct genus.

Description: Unicellular thalli spherical, ovoid, or cylindrical. Two isokont, anterior flagella. Protoplast separated from cell wall by a gelatinous layer. Posterior portion of protoplast reported to exhibit metaboly in some species. Single chloroplast cup-shaped, parietal, or H-shaped depending on the species. Pyrenoids present or absent depending on the species. Stigma present. Two or four anterior contractile vacuoles inserted between flagellar bases or many and scattered throughout the periphery of the protoplast. Papillum rarely present. A Polytoma-like species, V. hyalina, lacks photosynthetic pigments and pyrenoids. Asexual reproduction by zoosporogenesis normally producing four motile daughter cells. Aplanospore stages known for some species. Palmella and akinete stages have been reported. Isogamous sexual reproduction known only from V. nekrassowii (V. incisa). Cell wall in Vitreochlamys incisa of the type IV lattice (similar to Lobomonas piriformis), distinguished from the type III lattice in C. asymmetrica, the type II lattice in Brachiomonas, Chlorogonium, Chloromonas, Carteria and some species of Chlamydomonas, and the type I lattice in Chlamydomonas reinhardtii and Volvox aureus. Unicellular thalli spherical, ovoid, or cylindrical. Two isokont, anterior flagella. Protoplast separated from cell wall by a gelatinous layer. Posterior portion of protoplast reported to exhibit metaboly in some species. Single chloroplast cup-shaped, parietal, or H-shaped depending on the species. Pyrenoids present or absent depending on the species. Stigma present. Two or four anterior contractile vacuoles inserted between flagellar bases or many and scattered throughout the periphery of the protoplast. Papillum rarely present. A Polytoma-like species, V. hyalina, lacks photosynthetic pigments and pyrenoids. Asexual reproduction by zoosporogenesis normally producing four motile daughter cells. Aplanospore stages known for some species. Palmella and akinete stages have been reported. Isogamous sexual reproduction known only from V. nekrassowii (V. incisa). Cell wall in Vitreochlamys incisa of the type IV lattice (similar to Lobomonas piriformis), distinguished from the type III lattice in C. asymmetrica, the type II lattice in Brachiomonas, Chlorogonium, Chloromonas, Carteria and some species of Chlamydomonas, and the type I lattice in Chlamydomonas reinhardtii and Volvox aureus.

Comments: Ecologically diverse habitats ranging from oligotrophic to dystrophic bodies of water. Some species are found in temporary pools. No molecular data are available for this organism

NCBI Nucleotide Sequences

Numbers of names and species: There are 10 species (and infraspecific) names in the database at present, of which 6 have been flagged as currently accepted taxonomically.

Names: ('C' indicates a name that is currently accepted taxonomically; 'S' a homotypic or heterotypic synonym; 'U' indicates a name of uncertain taxonomic status, but which has been subjected to some verification nomenclaturally; 'P' indicates a preliminary AlgaeBase entry that has not been subjected to any kind of verification. For more information on a species click on it to activate a link to the Species database):

Vitreochlamys aulata (Pascher) Bako C 
Vitreochlamys fluviatilis (Stein) Batko C 
Vitreochlamys gloeocystiformis (Dill) Batko S 
Vitreochlamys gloeocystiformis (O.Dill) A.Nakazawa S 
Vitreochlamys gloeocystiformis (Dill) Batko P 
Vitreochlamys incisa (Pringsheim) Batko P 
Vitreochlamys lefevrei var. minor Tell P 
Vitreochlamys nekrassovii (Korshikov) A.Nakazawa C 
Vitreochlamys ordinata (H.Skuja) A.Nakazawa C 
Vitreochlamys pinguis A.Nakazawa C 

Information contributed by: M. Buchheim. The most recent alteration to this page was made on 15 Sep 2004 by M.D. Guiry.

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.