Phycokey - Cyclonexis images

Cyclonexis (Chrysophyceae)

Cyclonexis annularis
Modified from drawing posted at commons.wikimedia
From the Brockhaus and Efron Encyclopedic Dictionary (1890-1907)

Cyclonexis sp.
Image posted by Proyecto Agua

Cyclonexix annulis
Photograph from 'plingfactory' Germany, posted online