Coscinodiscophytina

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Coscinodiscophytina

Paralids

Chain-forming, heavily silicified; valves circular, radially symmetrical; rimoportulae or tube processes small, restricted to the mantle; girdle bands hoop-like. Paralia.

Melosirids

Usually chain-forming; valves circular, radially symmetrical; rimoportulae small, scattered on the valve face or marginal; girdle bands hoop-like or segmental. Aulacoseira, Melosira, Stephanopyxis.

Coscinodiscids

Solitary; valves generally circular, radiating from a central, subcentral or submarginal circular annulus; rimoportulae central, scattered on the valve face or marginal; girdle bands hoop-like. Actinoptychus, Coscinodiscus.

Arachnoidiscids

Solitary, heterovalvar; valves circular, radially symmetrical; valve centre with radial slits, apparently modified rimoportulae; girdle bands hoop-like. Arachnoidiscus.

Rhizosolenids

Chain-forming, rarely solitary; valves circular, radially symmetrical or with the pattern centre displaced towards one side; rimoportula single, associated closely with the annulus, sometimes developed into a spine; girdle bands segmental. Guinardia, Leptocylindrus, Rhizosolenia.

Corethrids

Solitary; valves circular; radially symmetrical; articulating spines secreted from around the valve margin; rimoportulae absent; girdle bands segmental. Corethron.

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