Hyphochytrids are eukaryotic organisms in the group of Stramenopiles (Heterokonta).

Scientific classification

Whittaker, 1969[1]

Sparrow ex M.W.Dick, 1983[2]

M.W.Dick, 2001[3]

Bessey, 1950[4]
  • Phylum Hyphochytridiomycota, orth. var.
    • Class Hyphochytridiomycetes Sparrow, 1958, Alexopoulos, 1962, orth. var.
    • Class Hyphochytrea Cavalier-Smith, 1986[5]
      • Order Hyphochytridae Cavalier-Smith, 1989[6]


They are distinguished by an anterior tinsel flagellum[7] on their zoospores. Also they have a rhizoidal or hypha-like vegetative system (hence the prefix "Hypho-").


This group may be put alternatively at the phylum, class, subclass or order level, being referred to as Hyphochytriomycota, Hyphochytriomycetes (or Hyphochytrea), Hyphochytriomycetidae (or Hyphochytridae) and Hyphochytriales, respectively. The variants Hyphochytridiomycota and Hyphochytridiomycetes are also sometimes used, presumably by analogy to the Chytridiomycetes, or due to the perpetuation of a typographical error. However, the stem is Hyphochytri- (from Hyphochytrium) and not Hyphochytridi- (from Chytridium).[8]

In the past the classes Hyphochytridiomycetes, Oomycetes and Chytridiomycetes were grouped together in the now obsolete taxon Mastigomycotina as fungi with flagellate spores or gametes. Now the Chytridiomycetes are still considered true fungi, but the other two sub-groups are classified in the kingdom Protista, or in the group Stramenopiles.

Hyphochytriomycetes are closely related to Oomycetes.[9]

Order Hyphochytriales Bessey 1950 ex Sparrow 1960


This is a relatively small group, composed of about 16 known species, which may be due in part, to sampling methods of scientists.

See alsoEdit


  1. ^ Whittaker, R.H. (1969). "New concepts of kingdoms of organisms". Science. 163 (3863): 150–160. CiteSeerX doi:10.1126/science.163.3863.150. PMID 5762760.
  2. ^ Dick, M.W. 1983. Validation of the class name Hyphochytriomycetes. In: Buczacki (ed.), Zoosporic Plant Pathogens, A Modern Perspective. London & New York: Academic Press.
  3. ^ M.W.Dick, Straminipilous Fungi: 330, 2001.
  4. ^ Bessey, E. A. 1950. Morphology and taxonomy of fungi, [1].
  5. ^ Cavalier-Smith, Prog. Phycol. Res. 4: 324, 1986.
  6. ^ Cavalier-Smith, In: Green, Leadbeater, and Diver (eds.), The Chromophyte Algae: 385 (1989).
  7. ^ "Chytridiomycota". Archived from the original on 2008-08-22. Retrieved 2009-05-26.
  8. ^ David, J. C. (2002). "A preliminary catalogue of the names of fungi above the rank of order". Constancea. 83: 1–30.
  9. ^ Van der Auwera G, De Baere R, Van de Peer Y, De Rijk P, Van den Broeck I, De Wachter R (July 1995). "The phylogeny of the Hyphochytriomycota as deduced from ribosomal RNA sequences of Hyphochytrium catenoides". Mol. Biol. Evol. 12 (4): 671–8. doi:10.1093/oxfordjournals.molbev.a040245. PMID 7659021.


External linksEdit