Densely-haired Aglaia (Aglaia densitricha)
This species was described in 1992, it is known only from the type material which had been collected in 1953 along a road in the state of Terengganu, Malaysia.
The species was not found since and is thought to might be extinct. [1]
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References:
[1] D. J. Mabberley; C. M. Pannell; A. M. Sing: Meliaceae. Flora Malesiana; Series 1 – Spermatophyta 12: 1-388. 1995
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edited: 04.09.2019
Schaefer’s Spiny-jawed Snake was described in 1995; it is, however, known from a single specimen that was collected in Hutan Lipur Templer, a forest reserve in the Gombak District of Selangor, Malaysia.
The species was apparently never found since; it is officially treated as “Data Deficient” but, given the ongoing destruction of many forests around the world, might well be already extinct.
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edited: 22.01.2022
King’s Alphonsea (Alphonsea kingii)
King’s Alphonsea is known only from the type material which was collected in the Kinta District of Perak, Malaysia, a region that today is heavily mined over, thus the survival of this species appears to be very doubtful.
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edited: 30.04.2021
Wooly-stalked Begonia (Begonia eiromischa)
The Wooly-stalked Begonia, described in 1917, was restricted to the small island Pulau Betong, Malaysia, it is known only from two collections made in 1886 and 1898.
The habitat is now completely destroyed and this species is definetly extinct.
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edited: 04.09.2019
De Crespigny’s Karst Snail (Opisthostoma decrespignyi)
This minute species, whose shell hardly reaches 0,2 cm, was described in the year 1865.
De Crespigny’s Karst Snail inhabited small islets like Pulau Burung, Pulau Daat, and Pulau Papan offshore the island state of Labuan, which again lies offshore Borneo’s northwest coast, where it was strictly restricted to limestone rocks.
The limestone (of all these islands ?) was removed in the 1960s by quarrying, and thus the habitat of this snail species was destroyed. [1]
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De Crespigny’s Karst Snail is now considered possibly extinct – however, there have been no recent surveys to confirm this assumption.
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References:
[1] Reuben Clements; Navjot S. Sodhi; Menno Schilthuizen; Peter K. L. Ng: Limestone Karsts of Southeast Asia: Imperiled Arks of Biodiversity. BioScience 56(9): 733-742. 2006
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edited: 04.11.2020
Catappa-leaved Castanopsis (Castanopsis catappifolia)
This species is known only from its type which had been collected in 1886 in the forests of the Malaysian Peninsula.
The tree has not been recorded since and is feared to be extinct.
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edited: 25.08.2022
Lesser Pygmy Flying Squirrel (Petaurillus emiliae)
The Lesser Pygmy Flying Squirrel was described in 1908 based on a single specimen that was collected in 1901 in Sabah, northern Borneo.
It is the smallest of the three species within its genus, reaching a full size of about 14 cm (including the tail).
The species was never found since its description and, probably being restricted to intact forest habitats, may now be extinct since large areas in the region have been converted into oil palm plantations.
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edited: 29.05.2019
Many-flowered Rose Apple (Syzygium myrianthum)
The Many-flowered Rose Apple, described in 1901, was found at an unknown locality in the state of Perak, Malyasia.
The species is only known from the type collection and may in fact already be extinct.
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edited: 28.03.2017
Ulu Bera Actinodaphne (Actinodaphne cuspidata)
This species appears to be known only from a single specimen that had been collected somewhere in the state of Perak, Malaysia in the last century.
The species is very likely extinct.
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edited: 26.11.2018