Читать книгу The Diatomaceæ of Philadelphia and Vicinity - Charles S. Boyer - Страница 15

Table of Contents

1. Coscinodisceæ.—Valve not divided by rays or costæ into sectors; puncta sometimes radiate; ocelli or processes absent.

2. Actinodisceæ.—Valve with radial striæ divided into sectors: ocelli and processes absent.

3. Eupodisceæ.—Valve disc-shaped with mammiform processes or one or more ocelli.