Cosmarium pseudoconnatum Nordst.

SÁNCHEZ, Luzmila, SÁNCHEZ, Fernando R., RÍOS-TOUMA, Blanca & José V. MONTOYA, 2025, Desmidiales (Desmidiaceae, Zygnematophyceae) from lowland rivers and floodplain lakes of Ecuadorian Amazonia, Cryptogamie, Algologie 20 (3), pp. 31-60 : 37

publication ID	https://doi.org/10.5252/cryptogamie-algologie2025v46a3
DOI	https://doi.org/10.5281/zenodo.17067965
persistent identifier	https://treatment.plazi.org/id/C7390B66-FFF7-9139-ACA9-FCD80A3FF9EF
treatment provided by	Plazi
scientific name	Cosmarium pseudoconnatum Nordst.
status

Treatment

( Fig. 2H View FIG )

Videnskabelige meddelelser fra Dansk naturhistorisk forening i Københaven 21 (14-15): 214 ( Nordstedt 1870). — Calocylindrus pseudoconnatus (Nordstedt) Wolle , Bulletin of the Torrey Botanical Club 8 (4): 39 ( Wolle 1881). — Pleurotaeniopsis pseudoconnata (Nordstedt) Lagerheim, Botaniska Notiser 1887: 197 ( Lagerheim (1887).

DISTRIBUTION. — Cosmopolitan. Amazon Basin: Scott et al. (1965); Förster (1969, 1974); Thomasson (1971); Uherkovich (1976); Uherkovich & Franken (1980); Lopes & Bicudo (2003); Melo et al. (2005); Souza de et al. (2007); Melo & Souza de (2009). Western Amazonia (lowlands): Krieger & Scott (1957); Montoya (1974); Duque & Donato (1996a), Duque & Nuñez-Avellaneda (2000); Nuñez-Avellaneda (2008).

DESCRIPTION

Cells 46.0-54.5 µm long, 34.5-41.4 µm wide, isthmus 31.0-37.0 µm, cells 1.3 times longer than wide. Punctuated cell wall, smooth isthmic region, apical view of cells circular, median constriction not very marked, and shallow median sinus. Subsemicircular semicells, lateral view of semicell same as front. Parietal chloroplast.

Kingdom	Plantae
Phylum	Charophyta
Class	Conjugatophyceae
Order	Zygnematales
Family	Desmidiaceae
Genus	Cosmarium