Some time ago, I discovered a colony of Girardia in a pond near my home in French Polynesia. However, this taxon isn’t officially present in Polynesia, and the INaturalist community hasn’t identified it beyond the genus level. So I don’t know if these Girardia are a new species. How can I find out?
https://www.inaturalist.org/observations/239543013
https://www.inaturalist.org/observations/271891401
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Usually, a taxonomist with extensive familiarity with the genus has to notice that it doesn’t match anything they know. That’s why taxonomists tend to be specialists – because there are only so many genera that one person can know that well.
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has engaged with both obs. You also have thoughtful helpful comments there.
The next step is patience … (ask me how I know 
This plant has only 4 obs on iNat
And this identifier who has gone in search of the ID, arrived on iNat yesterday!