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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):
1 Periplast composed of siliceous scales

2

Periplast without siliceous elements 5
2 Periplast with tangential rod-shaped spicules or plates Raphidiophryidae
Periplast wit tangential plates and radial spicules 3
3 Radial spicules with centrally attached basal plate Acanthocystidae
Radial spines without such a plate 4
4 Radial spines with winglike structures Pterocystidae
Radial spines with eccentrically attached basal plate Choanocystidae
5 18S rRNA short Heterophryidae
18S rRNA markedly longer Marophryidae
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