The Ichthyosporea (or DRIP clade, or Mesomycetozoea) are a small group of Opisthokonta in Eukaryota (formerly protists), mostly parasites of fish and other animals.
| Ichthyosporea Temporal range:
| |
|---|---|
| |
| Sphaeroforma arctica | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Clade: | Amorphea |
| Clade: | Obazoa |
| (unranked): | Opisthokonta |
| (unranked): | Holozoa |
| Class: | Ichthyosporea Cavalier-Smith, 1998[1] |
| Orders | |
| Synonyms | |
|
Mesomycetozoa Mendoza et al., 2002 | |
Significance
editThey are not particularly distinctive morphologically, appearing in host tissues as enlarged spheres or ovals containing spores, and most were originally classified in various groups as fungi, protozoa, or colorless algae. However, they form a coherent group on molecular trees, closely related to both animals and fungi and so of interest to biologists studying their origins. In a 2008 study they emerge robustly as the sibling-group of the clade Filozoa, which includes the animals.[2][3]
Huldtgren et al., following x-ray tomography of microfossils of the Ediacaran Doushantuo Formation, has interpreted them as mesomycetozoan spore capsules.[4]
Terminology
editThe name DRIP is an acronym for the first protozoa identified as members of the group,[5] Cavalier-Smith later treated them as the class Ichthyosporea, since they were all parasites of fish.
- order Dermocystida
- "D": Dermocystidium. One species, Rhinosporidium seeberi, infects birds and mammals, including humans.
- "R": the "rosette agent", now known as Sphaerothecum destruens
- order Ichthyophonida
- "I": Ichthyophonus
- "P": Psorospermium
Since other new members have been added (e.g. the former fungal orders Eccrinales and Amoebidiales), Mendoza et al. suggested changing the name to Mesomycetozoea, which refers to their evolutionary position. On Eukaryota tree, in Opisthokont clade, Mesomycetozoea is in the middle ("Meso-") of the fungi ("-myceto-") and the animals ("-zoea").[6] The name Mesomycetozoa (without a third e) is also used to refer to this group, but Mendoza et al. use it as an alternate name for basal Opisthokonts.[7]
Phylogeny
edit
| Ichthyosporea[8][9] |
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Taxonomy
edit- Class Ichthyosporea Cavalier-Smith 1998[10][11]
- Order Dermocystida Cavalier-Smith 1998
- Family Rhinosporidiaceae Mendoza et al. 2001
- Order Ichthyophonida Cavalier-Smith 1998
- Suborder Sphaeroformina Cavalier-Smith 2012
- Family Creolimacidae Cavalier-Smith 2012
- Family Psorospermidae Cavalier-Smith 2012
- Family Piridae Cavalier-Smith 2012
- Suborder Trichomycina Cavalier-Smith 2012
- Genus †Paleocadus Poinar 2016
- Family Amoebidiidae Lichtenstein 1917 ex Kirk et al. 2001
- Family Ichthyophonidae Cavalier-Smith 2012
- Family Paramoebidiidae Reynolds et al. 2017
- Family Parataeniellaceae Manier & Lichtward 1968
- Family Eccrinaceae Leger & Duboscq 1929 [Palavasciaceae Manier & Lichtward 1968]
- Suborder Sphaeroformina Cavalier-Smith 2012
- Order Dermocystida Cavalier-Smith 1998
References
edit- ^ Cavalier-Smith, T. 1998. Neomonada and the origin of animals and fungi. In: Coombs GH, Vickerman K, Sleigh MA, Warren A (ed.) Evolutionary relationships among protozoa. Kluwer, London, pp. 375-407,
- ^ Shalchian-Tabrizi, Kamran; Minge, Marianne A.; Espelund, Mari; Orr, Russell; Ruden, Torgeir; Jakobsen, Kjetill S.; Cavalier-Smith, Thomas; Aramayo, Rodolfo (7 May 2008). Aramayo, Rodolfo (ed.). "Multigene phylogeny of choanozoa and the origin of animals". PLOS ONE. 3 (5): e2098. Bibcode:2008PLoSO...3.2098S. doi:10.1371/journal.pone.0002098. PMC 2346548. PMID 18461162.
- ^ Dawkins, Richard; Wong, Yan (2016). The Ancestor's Tale. Houghton Mifflin Harcourt. ISBN 978-0544859937.
- ^ Douglas Fox, "How life got complicated", Discover Magazine, December 2012.
- ^ Ragan MA, Goggin CL, Cawthorn RJ, et al. (October 1996). "A novel clade of protistan parasites near the animal-fungal divergence". Proc. Natl. Acad. Sci. U.S.A. 93 (21): 11907–12. Bibcode:1996PNAS...9311907R. doi:10.1073/pnas.93.21.11907. PMC 38157. PMID 8876236.
- ^ Herr RA, Ajello L, Taylor JW, Arseculeratne SN, Mendoza L (September 1999). "Phylogenetic Analysis of Rhinosporidium seeberi's 18S Small-Subunit Ribosomal DNA Groups This Pathogen among Members of the Protoctistan Mesomycetozoa Clade". J. Clin. Microbiol. 37 (9): 2750–4. doi:10.1128/JCM.37.9.2750-2754.1999. PMC 85368. PMID 10449446.
- ^ Mendoza L, Taylor JW, Ajello L (October 2002). "The class mesomycetozoea: a heterogeneous group of microorganisms at the animal-fungal boundary". Annu. Rev. Microbiol. 56: 315–44. doi:10.1146/annurev.micro.56.012302.160950. PMID 12142489.
- ^ Borteiro, Claudio; Baldo, Diego; Maronna, Maximiliano Manuel; Ubilla (2018). "Amphibian parasites of the Order Dermocystida (Ichthyosporea): current knowledge, taxonomic review and new records from Brazil". Zootaxa. 4461 (4): 499–518. doi:10.11646/zootaxa.4461.4.3. hdl:11336/84098. PMID 30314064. S2CID 52977120.
- ^ Reynolds, Nicole K.; Smith, Matthew E.; Tretter, Eric D.; Gause, Justin; Heeney, Dustin; Cafaro, Matías J.; Smith, James F.; Novak, Stephen J.; Bourland, William A.; White, Merlin M. (2017). "Resolving relationships at the animal-fungal divergence: A molecular phylogenetic study of the protist trichomycetes (Ichthyosporea, Eccrinida)". Molecular Phylogenetics and Evolution. 109: 447–464. Bibcode:2017MolPE.109..447R. doi:10.1016/j.ympev.2017.02.007. PMID 28219758.
- ^ Cavalier-Smith (May 2012). "Early evolution of eukaryote feeding modes, cell structural diversity, and classification of the protozoan phyla Loukozoa, Sulcozoa, and Choanozoa". European Journal of Protistology. 49 (2): 115–178. doi:10.1016/j.ejop.2012.06.001. PMID 23085100.
- ^ Crous PW, Gams W, Stalpers JA, Cannon PF, Kirk PM, David JC, Triebel D (November 2004). "An online database of names and descriptions as an alternative to registration". Mycological Research. 108 (11): 1236–1238. doi:10.1017/S0953756204221554.
- "Eccrinida". Species Fungorum. 2016.