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Malmgrenia castanea is a species of segmented worms in the family polynoid scaleworms. They are biodiffusors. They are carnivores. Individuals can grow to 18 mm. They are crawlers.

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EOL has data for 25 attributes, including:

Known occurrences, collected specimens and observations of Malmgrenia castanea McIntosh 1876. View this species on GBIF