• xitellus richardsoni,
• vitellus richardsoni,
• fitellus richardsoni,
• ditellus richardsoni,
• cutellus richardsoni,
• cjtellus richardsoni,
• cktellus richardsoni,
• cotellus richardsoni,
• c9tellus richardsoni,
• c8tellus richardsoni,
• cirellus richardsoni,
• cifellus richardsoni,
• cigellus richardsoni,
• ciyellus richardsoni,
• ci6ellus richardsoni,
• ci5ellus richardsoni,
• citwllus richardsoni,
• citsllus richardsoni,
• citdllus richardsoni,
• citrllus richardsoni

The adjective form of "Citellus Richardsoni" would be "Richardson's" as it is a proper adjective originating from the scientific name of the species.

The plural form of the word "Citellus Richardsoni" is "Citellus Richardsoni." It remains the same in both singular and plural form.

The singular form of the word "Citellus Richardsoni" is "Citellus Richardsoni" itself. It is the scientific name for a specific species of ground squirrel commonly known as the Richardson's ground squirrel. The scientific name remains unchanged in both singular and plural usage.