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Image by Carosaurus via FlickrMessengers isn't a given Sears subject heading but is inferred from: Persons SA classes of persons, e.g. Elderly; Handicapped; Explorers; Drug addicts; etc. [to be added as needed]One of the nice things about Sears is those generic terms which can be expanded "as needed." I do check LCSH Authorities to see whether such a heading was listed and it was.
Unfortunately, Microorganisms does not have a similar note so the list of choices is limited to Bacteria; Protozoa; and Viruses. Not very helpful. I had to catalog a film about the red tide (a toxic dinoflagellate bloom) so I added Dinoflagellates and Red tide to the record. Both are LCSH. I could have used the more generic Algae for dinoflagellates but specificity is good in a record. Besides, dinoflagellates are curious critters since both botany and zoology have claimed them. It's only fairly recently that some kind of agreement has been reached about their classification. See Wikipedia article for more info.
BTW, Sears is mistaken to make Marine plants a broader term for Algae since not all algae are marine. It also doesn't cross reference Algae from Microorganisms, which could be helpful.
I just confirmed that the use of Dinoflagellates can be inferred from the following: Plants SA ... names of categories of plants, e.g. Ferns [to be added as need]. Aha!
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