Gomez’s Lagenandra (Lagenandra gomezii)
This species was described in 1857; it is known only from material that was collected in 1828 somewhere in the Sylhet Division in north-eastern Bangladesh.
The original locality is now a very densely populated region and given the fact that the species has never been relocated since its description, it is quite safe to say that it is extinct.
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edited: 12.05.2022