- Dictyostelium purpureum
Dictyostelium purpureum Scientific classification Domain: Eukarya Kingdom: Amoebozoa Phylum: Mycetozoa Class: Dictyostelia Order: Dictyosteliida Family: Dictyosteliidae Genus: Dictyostelium Species: D. purpureum
D.purpureum is a distinct species from D. discoideum, although it belongs in the same phenotypic grouping. Like D. discoideum, it exhibits a robust multicellular life cycle, and shares some of the early signaling molecules with D. discoideum. Both species spend vegetative growth preying on bacteria in the soil, and when starved, aggregate to enter multicellular development that culminates into a fruiting body with resistant viable spores (D. purpureum is so named for its strikingly purple spores), and supporting stalk structures. 
Altruism in the specie
Wild strains of D. purpureum were taken from the Houston Arboretum and took back to the lab where they were cultured in dishes. In each of 14 experiments, a pair of strains were placed in a dish in equal proportion, and one of the strains in each pair was labeled with a fluorescent dye. Food was withheld, causing the microbes in each dish to form dozens of slugs and fruiting bodies. Upon observing their social development, the team found that individual fruiting bodies contained predominantly one strain or the other. This shows that an individual D. purpureum isn't going to offer itself to form a stalk unless it's sure that the rest of the aggregate, benefit from its sacrifice or a close relative. This demonstrated that molecular recognition of "self" and "close to self" (the basis of a modern immune system) happens even in primitive organisms. 
- ^ Mehdiabadi NJ, Kronforst MR, Queller DC, Strassmann JE (February 2009). "Phylogeny, reproductive isolation and kin recognition in the social amoeba Dictyostelium purpureum". Evolution 63 (2): 542–8. doi:10.1111/j.1558-5646.2008.00574.x. PMID 19215294. http://www3.interscience.wiley.com/resolve/openurl?genre=article&sid=nlm:pubmed&issn=0014-3820&date=2009&volume=63&issue=2&spage=542.
- ^ http://genome.jgi-psf.org/Dicpu1/Dicpu1.home.html
- ^ http://tdj.livejournal.com/1261231.html
discosean: Dermamoebaother: Sappinia, ThecamoebaArcellinidaEuamoebida
Echinamoebidae (Echinamoeba, Filamoeba, Gephyramoeba, Hartmannella vermiformis)
Leptomyxida (Leptomyxa, Rhizamoeba, Flabellula, Paraflabellula)Amoebidae (Amoeba, Chaos, Hydramoeba, Metachaos, Polychaos, Trichamoeba) · Hartmannellidae (Glaeseria, true Hartmannella, Nolandella, Saccamoeba)Centramoebida
ConosaMacromycetozoaProtostelialesPlanoprotostelium · ProtosteliumOtherPhalansterium · Multicilia BreviateaBreviata Other/ungroupedStereomyxa · Trichosphaerium This protist-related article is a stub. You can help Wikipedia by expanding it.