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| Russian | English |
| домик простейший | lorica (a protective external shell or case, as of a rotifer or any of certain other microscopic organisms) |
| домик простейших | lorica (a protective external shell or case, as of a rotifer or any of certain other microscopic organisms) |
| простейшее животное | protozoan |
| простейший полип | hydrula (1. a hypothetical primitive polyp of simple type; 2. a developmental phase of many coelenterates [as hydroids] in which they have the form of a simple polyp) |