Biology:Plasmodiidae

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Short description: Family of apicomplexan protists

Plasmodiidae
Plasmodium vivax 01.png
A mature Plasmodium vivax trophozoite
Scientific classification e
Domain: Eukaryota
Clade: Diaphoretickes
Clade: SAR
Clade: Alveolata
Phylum: Apicomplexa
Class: Aconoidasida
Order: Haemospororida
Family: Plasmodiidae
Mesnil, 1903
Genera

See text

The Plasmodiidae are a family of apicomplexan parasites, including the type genus Plasmodium, which is responsible for malaria. This family was erected in 1903 by Mesnil and is one of the four families in the order Haemospororida.

Diagnostic criteria

The diagnostic criteria of the Plasmodiidae are:

  • Macrogametes and microgamonts develop independently
  • Meiosis is absent
  • Microgametocyte produces eight flagellated microgametes
  • Zygote is motile (known as an ookinete)
  • Conoid present in ookinete stage only
  • Sporozoites naked in oocyst (that is without a sporocyst)
  • Sporozoites have three walls
  • Heteroxenous: merogony and gamogony occur in vertebrate host, and fertilization and sporogony in definitive host (a blood-sucking insect)
  • Hemozoin pigment is produced

Taxonomy

The family Plasmodiidae has three sister taxa in the order Haemospororida: the families Garniidae, Haemoproteidae, and Leucocytozoidae.

The Haemoproteidae and the Plasmodiidae both produce pigment, and these have been placed in the suborder Laveraniina.

Neither the Haemoproteidae nor the Leucocytozoidae have an asexual cycle in the peripheral blood.

The Garniidae do not produce pigment, but do have an asexual cycle in the blood. They appear to be the earliest diverging clade in this group.

The Plasmodiidae contain these genera:

The genus Mesnilium is the only taxon that infects fish. The genus has a single species and has been reported only once. This genus may have been mistakenly placed in this genus. DNA studies are likely to be needed to clarify this point.

References

Wikidata ☰ Q1929486 entry