Centrohelea - Microworld

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

Ferry Siemensma
Created March 3, 2019
Last updated August 02, 2019

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