It may be necessary to distinguish between detritivores and saprotrophs based on the fact the former ingest and digest dead organic matter internally, while the latter absorb nutrients through external chemical and biological processes, see https://www.differencebetween.com/difference-between-detritivores-and-vs-saprotrophs/

There is some debate over whether saprotroph and subclasses should be broad synonyms of detritivore and subclasses. We welcome input on our issue tracker: https://github.com/nleguillarme/soil_trophic_web_ontology/

A decomposer that obtains nutrition through extracellular digestion of decaying organic matter