Cladophorales are an order of green algae, in the class Ulvophyceae. There is a plausible fossil example in the mid-Ordovician Winneshiek shale
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[ "Phylogenetic tree", "Chlorophyta", "Cladophora", "Green algae", "Basicladia", "Struvea", "Chaetomorpha melagonium", "Anadyomenaceae", "Pithophoraceae" ]