Dictyochophyceae

class of algae

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June 25, 2026

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The Dictyochophyceae are a class of algae, predominantly marine flagellates. This group includes silicoflagellates, which form skeletons found in diatomite deposits. The class contains fewer than 25 described species and is divided into two orders: Pedinellales and Dictyochales (silicoflagellates). The Dictyochales are characterized by siliceous skeletons resembling spiny baskets that enclose the cells. Fossils of Dictyochophyceae date back to approximately 100 million years ago.12

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4 Britannica Sources

algae - Annotated classification
Dictyotaceae
algae - Evolution and paleontology of algae
Charophyceae

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algae
Annotated classification
Class Dictyochophyceae Predominantly marine flagellates, including silicoflagellates that form skeletons common in diatomite deposits; fewer than 25 described species. Order Pedinellales When pigmented, has 6 chloroplasts in a radial arrangement; flagella bases attached almost directly to nucleus; includes Apedinella, Actinomonas, Mesopedinella
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Class Dictyochophyceae Predominantly marine flagellates, including silicoflagellates that form skeletons common in diatomite deposits; fewer than 25 described species. Order Pedinellales When pigmented, has 6 chloroplasts in a radial arrangement; flagella bases attached almost directly to nucleus; includes Apedinella, Actinomonas, Mesopedinella
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protozoan
Annotated classification
Dictyochophyceae Solitary or colonial flagellates or amoebae; cells may be naked, produce organic scales, or otherwise possess silica skeletons. Chloroplasts possess girdle lamella; plastid DNA has scattered granule-type genophore. Lack eyespots. Flagellated cells possess a paraflagellar rod. Opalinata Multiple cilia with a double-stranded
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Dictyochophyceae Solitary or colonial flagellates or amoebae; cells may be naked, produce organic scales, or otherwise possess silica skeletons. Chloroplasts possess girdle lamella; plastid DNA has scattered granule-type genophore. Lack eyespots. Flagellated cells possess a paraflagellar rod. Opalinata Multiple cilia with a double-stranded
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