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We will continue working on checklists and will soon add a new type of checklist based strictly on our nativity layers. Since our existing checklists are based strictly on occurrences, they may lack species for which we lack, or have only spotty data. For example, we are well aware of our relatively sparse data for American Eel (Anguilla rostrata), which we are confident is due to an artifact of sampling biases or rareness. But we also know, based on life history and other data, that this species occurs in many places from which we lack specimens. Producing checklists based on our nativity layers should skirt such problems and provide consistently more taxonomically complete checklists.
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