Monactinus

Monactinus is a genus of green algae in the family Hydrodictyaceae.[1] It is very common in freshwater regions throughout the world.[2]

Monactinus
Monactinus simplex
Scientific classification Edit this classification
(unranked): Viridiplantae
Division: Chlorophyta
Class: Chlorophyceae
Order: Sphaeropleales
Family: Hydrodictyaceae
Genus: Monactinus
Corda, 1839
Species
  • Monactinus asymmetricus
  • Monactinus simplex

Description

Monactinus forms flat colonies, termed coenobia, of cells in powers of two, usually four, eight, or 16. Coenobia are disc-shaped in outline, and marginal cells are drawn out into one lobe or point. This distinguishes it from Pediastrum and closely related genera, which have marginal cells which are drawn out into two lobes or points.[3] Monactinus shows a considerable amount of morphological diversity, with cells displaying different shapes, cell wall surface granulations, and inter-cellular gaps (or lack thereof).[4] Cells have one chloroplast filling the cell, each with a single pyrenoid.[3]

Taxonomy

Although Monactinus was first described by August Carl Joseph Corda in 1839, for most of its history it was considered to be a synonym of Pediastrum. In 2005, molecular phylogenetic analyses showed that Pediastrum sensu lato was paraphyletic with respect to Hydrodictyon. Therefore, Pediastrum was split up into several genera, including Monactinus.[5]

References
  1. See the NCBI webpage on Monactinus. Data extracted from the "NCBI taxonomy resources". National Center for Biotechnology Information. Retrieved 2007-03-19.
  2. McManus, Hilary A.; Lewis, Louise A. (2011). "Molecular Phylogenetic Relationships in the Freshwater Family Hydrodictyaceae (Sphaeropleales, Chlorophyceae), with an Emphasis on Pediastrum duplex". Journal of Phycology. 47 (1): 152–163. doi:10.1111/j.1529-8817.2010.00940.x. PMID 27021721. S2CID 20549311.
  3. Bicudo, Carlos E. M.; Menezes, Mariângela (2006). Gêneros de Algas de Águas Continentais do Brasil: chave para identificação e descrições (2 ed.). RiMa Editora. p. 508. ISBN 857656064X.
  4. Rosini, Edna Ferreira; Sant'Anna, Célia Leite; Tucci, Andréa (2012). "Chlorococcales (exceto Scenedesmaceae) de pesqueiros da Região Metropolitana de São Paulo, SP, Brasil: Levantamento florístico". Hoehnea. 39: 11–38. doi:10.1590/S2236-89062012000100002.
  5. Buchheim, Mark; Buchheim, Julie; Carlson, Tracy; Braband, Anke; Hepperle, Dominik; Krienitz, Lothar; Wolf, Matthias; Hegewald, Eberhard (2005). "Phylogeny of the Hydrodictyaceae (Chlorophyceae): Inferences from rDNA Data". Journal of Phycology. 41 (5): 1039–1054. doi:10.1111/j.1529-8817.2005.00129.x. S2CID 83698514.


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