desmid

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desmid,

a protist of the class Charophyceae (see ChlorophytaChlorophyta
, phylum (division) of the kingdom Protista consisting of the photosynthetic organisms commonly known as green algae. The organisms are largely aquatic or marine.
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).

desmid

[′dez·məd]
(botany)
Any member of a group of microscopic, unicellular green algae of the family Desmidiaceae, having cells of varying shapes but always composed of mirror-image semicells, often demarcated by a median constriction or incision, and a cell wall that has pores, which are frequently ornamented.
References in periodicals archive ?
Other desmids also were described having apical concavity as Vincularia roraimae K.
Group Jan Feb Mar Apr May Jun Jul Aug Sep Ga 7.6 52.3 38.3 36.1 29.5 52.5 63.3 38.4 36.6 Bga 17.6 8.5 7.9 16.3 16.3 6 3 15.6 8.1 Dia 62.8 15.8 26.9 17 18.6 16.6 18.1 19 31.8 Des 3 9.3 7.3 11.5 20.5 12.9 6.5 9.3 8.8 Pro 0.3 1.5 4.2 5.9 4.4 1.1 0 4.2 3.5 Cru 0 0.8 0.7 0.2 0 0 0 0 0.2 Rot 0 0 0.9 0.2 0 0 0 0 0 Ins 0.1 0.2 5.1 0.1 0.7 0.9 0.5 0.3 0 Mis 8.6 11.6 8.7 12.9 10 10 8.6 13.1 11 Group Oct Nov Dec Average Ga 48 48.9 14 36.5 Bga 10 10.1 27.1 12.8 Dia 3.3 11 44.5 25.4 Des 28.6 12.9 6.1 11 Pro 2.1 4.9 2.2 3.2 Cru 0 1.4 0 0.3 Rot 0 0.1 0 0.1 Ins 0 1.8 0.1 1.1 Mis 7.9 8.9 5.9 9.7 ga: green algae; bga: blue-green algae; dia: diatom; des: desmids; pro: protozoa; cru: crustacean; rot: rotifer; ins: insect; mis: miscellaneous.
Wisconsin Desmids. III: Desmid community composition and distribution in relation to lake type and water chemistry.
Key words: Desmids, taxonomy, ecology, Colombian Amazon Basin.
The most important factor towards a correct taxonomical identification of algae is the careful detailed knowledge of its morphological variability, much more when desmids are concerned since the species concept in the group is presently so very bad defined (Kouwets, 2008).
Botos Lake was dominated by dinoflagelates (Hargraves & Viquez 1981, Umana 2001), Chato Lake was dominated by desmids (Arthodesmus bifidus) and Cryptophyta was not found in the samples (Umana & Jimenez 1995).
Among the Chlorophyta, the desmids were the most diverse, accounting for 52% of the taxa of this division.
(2007) studied the Paraibuna and Pomba River and recorded a dominance of diatoms and desmids in the biovolume in the middle and downstream stretch of Pomba River.