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Centrohelea Kühn 1926

Diagnosis: Non-flagellate heliozoa with axopodial axonemes; nucleus eccentric; centrosome central; two types of siliceous scales present ancestrally (flat inner tangential plate scales and elongated, usually pointed, outer radial spine scales), but outer scales or both scale layers secondarily lost in several derived lineages.

Included families (key should be updated):
1Periplast composed of siliceous scales

2

Periplast without siliceous elements5
2Periplast with tangential rod-shaped spicules or platesRaphidiophryidae
Periplast wit tangential plates and radial spicules3
3Radial spicules with centrally attached basal plateAcanthocystidae
Radial spines without such a plate4
4Radial spines with winglike structuresPterocystidae
Radial spines with eccentrically attached basal plateChoanocystidae
518S rRNA shortHeterophryidae
18S rRNA markedly longerMarophryidae
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