What is in a model?

After reading contradictory claims of model status for some insect species, we feel a brief discussion of the topic may be useful. Here, we document a few examples where clarity on model status seems to be lacking, briefly review work on widely recognized models, and offer criteria for including any given species as a model organism. What are the model species in research? Easily maintained in culture systems. Research subjects of many scientists. Research findings applicable to a broad range of other organisms. Outcomes from model to be published in respected journals. Highlight What are the model species in research? They are easily maintained in culture systems and research subjects of many scientists. Research findings in models can be applied to a broad range of other organisms. Works on model species lead to publications in respected journals.