Plagioselmis

{{Short description|Genus of single-celled organisms}}

{{Taxobox

| domain = Eukaryota

| phylum = Cryptophyta

| classis = Cryptophyceae

| ordo = Cryptomonadales

| familia = Cryptomonadaceae

| genus = Plagioselmis

| genus_authority = Butcher 1967 ex Novarino, Lucas & Morrall 1994

| type_species = Plagioselmis prolonga

| type_species_authority = Butcher 1967 ex Novarino, Lucas & Morrall 1994

| subdivision_ranks = Species

| subdivision =

• P. lacustris (Pascher & Ruttner 1913) Javornický 2001
• P. nannoplanctica (Skuja 1948) Novarino, Lucas & Morrall 1994{{Cite book|title = Freshwater Algae of North America: Ecology and Classification|url = https://books.google.com/books?id=yjnLAwAAQBAJ|publisher = Elsevier|date = 2015-06-05|isbn = 9780123858771|first1 = John D.|last1 = Wehr|first2 = Robert G.|last2 = Sheath|first3 = J. Patrick|last3 = Kociolek|page = 840}}
• P. prolonga Butcher 1967 ex Novarino, Lucas & Morrall 1994{{cite journal |author=B. H. Kim, M. S. Han & N. Takamura |title=Effects of fish introduction on the length of the tail of cryptomonads in mesocosm experiments |journal=Oecologia |volume=136 |issue=1 |pages=73–79 |date=June 2003 |pmid=12820066 |doi=10.1007/s00442-003-1226-3|bibcode=2003Oecol.136...73K |s2cid=7490221 }}
• P. pygmaea (Javornický 1976) Javornický 2001

}}

Plagioselmis is a genus of cryptophytes, including the species Plagioselmis punctata.{{ITIS |taxon=Plagioselmis |id=10672}}

Plagioselmis was first described by Butcher in 1967 as a saltwater life form. In 1994, Novarino placed the freshwater Rhodomonas minuta into the genus, giving it the new binomial name of Plagioselmis nannoplanctica. P. nannoplanctica is the only freshwater species in this genus. Rhodomonas was first described by Klaveness, who agreed with the reclassification.{{Cite book|title = Archiv für Hydrobiologie: Supplement volume|url = https://books.google.com/books?id=tI3zAAAAMAAJ|publisher = E. Schweizerbart|date = 2001-01-01|page = 112}}

The cells are comma-shaped and appear red or similar colors. Some strains within the genus appear to have a furrow, while other do not. Researchers have suggested that those without furrows should be placed into a new genus.