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
Lister’s Narrow-flowered Dahlbergia (Dalbergia confertiflora ssp. listeri)
Lister’s Narrow-flowered Dahlbergia was described in 1975, it is a large woody climbing plant that is apparently only known from the vicinity of Chittagong, the second-largest city of Bangladesh.
It has never been recorded again after its description and is considered likely extinct.
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This variety is not accepted by all botanists and is sometimes treated as a synonym of the nominate form of the Narrow-flowered Dahlbergia (Dalbergia confertiflora Benth.).
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References:
[1] M. Atiqur Rahman; M. Enamur Rashid: Status of endemic plants of Bangladesh and conservation management strategies. International Journal of Environment 2(1): 231-249. 2013
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edited: 16.05.2021
Bangladesh Rotala (Rotala simpliciuscula)
The Bangladesh Rotala was described in 1880, it is thought to originate from Bangladesh (and Burma according to some sources), where it allegedly was found growing in rice fields.
The species, however, seems not to be accepted by all authors, thus this may in fact be nothing but a synonym for another species.
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edited: 16.04.2019
The Chittagong Croton is, or probably was, a small tree that was found once in 1939 at a place named Myanimukh on a slope of a forested hill in the Chittagong Hill Tracts, a province in eastern Bangladesh.
The species was described in 1983; it has never found since the type collection and might well be extinct.
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edited: 13.08.2022
Braman Frog (Rana brama)
The enigmatic braman Frog is known exclusively from a single illustration (shown here), which, however, may or may not correspond to a specimen that is kept in the National Museum of Natural History in France.
The species is believed to originate from an area somewhere between Bangladesh and India.
The Braman Frog may actually never have existed as a distinct species, however, I’d like to list it here as well, since it’s name often appears in listings of extinct animals.
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edited: 11.05.2019