Animals discovered since 1900

Try to get a copy of the following book:-

The Lost Ark; New and Rediscovered Animals of the 20th Century (Karl Shuker, 1993)
the second edition is from 2003 (I think) and entitled "The New Zoo"
 
OK, I haven't looked through every post in this topic but here's a partial list of only Primates from about 1990 on, but with a few earlier species.

Large Iron-gray Dwarf Lemur
Small Iron-gray Dwarf Lemur
Golden-brown Mouse Lemur
Northern Rufous Mouse Lemur
Sambirano Mouse Lemur
Bongolava Mouse Lemur
Danfoss's Mouse Lemur
Jolly's Mouse Lemur
Simmons's Mouse Lemur
Goodman's Mouse Lemur
Mittermeier's Mouse Lemur
Berthe's Mouse Lemur

Microcebus mamiratra (unnamed, 2 subspecies)
Claire's Mouse Lemur Microcebus mamiratra mamiratra
Lokobe Mouse Lemur Microcebus mamiratra lokobensis
Northern Mouse Lemur

Fork-marked Lemur subspecies
Amber Mountain Fork-marked Lemur
Pale Fork-marked Lemur
Pariente's Fork-marked Lemur

Ranomafana Bamboo Lemur (Hapalemur griseus ranomafanensis)
Tsiombikibo Bamboo Lemur Hapalemur griseus ssp. (not sure on this one)

Ahmanson's Sportive Lemur
Wright's Sportive Lemur
Antafia Sportive Lemur
Randrianasolo's Sportive Lemur
Seal's Sportive Lemur
Sahamalaza Peninsula Sportive Lemur
Betsileo Sportive Lemur
Daraina Sportive Lemur
James's Sportive Lemur
Mittermeier's Sportive Lemur
Petter's Sportive Lemur

unnamed
Lepilemur tymerlachsoni
Lepilemur hubbardi

Uncertain
Lepilemur otto?
Lepilemur scottorum?

Rondo Bushbaby
Rungwe Bushbaby
Uzungwa Bushbaby
False Potto
Bemaraha Woolly Lemur
Sambirano Woolly Lemur

Southern Woolly Lemur Avahi meridionalis subspecies
Avahi meridionalis meridionalis
Avahi meridionalis peyrierasi
Avahi meridionalis mooriorum

Golden-crowned Sifaka
Sun-tailed Guenon
Ngotto Guenon
Nigerian White-throated Guenon
Blond Capuchin
Ka'apor Capuchin
Highland Mangabey
Uganda Mangabey
Lariang Tarsier
Dian's Tarsier
Siau Tarsier
Rio Acari Marmoset
Rio Manicore Marmoset
Rio Maues Marmoset
Dwarf Marmoset
Black-headed Marmoset
Satere Marmoset
Marca's Marmoset
Black-faced Lion Tamarin
Coimbra's Titi Monkey
Bernhard's Titi Monkey
Golden Palace Titi Monkey (this one has a whole website dedicated to it!)

unnamed
Callicebus cupreus stephennashi
Callicebus personatus barbarabrownae
Callicebus moloch baptista

Araca Uakari?
Neblina Uakari?
Arunachal Macaque
Siberut Macaque
Northern Talapoin
Semliki Red Colobus
Niger Delta Red Colobus
Bhutan Golden Langur
Bicolor Langur
Gray-shanked Douc
Qinling Golden Monkey
Hubei Golden Monkey
 
The Northern Talapoin was discovered in 1969 but was never named.

Jonathan Kingdon in his book The Kingdon Field Guide to African Mammals, published in 1997 by Academic Press mentions this fact on page 55. He proposed a nomen nudem of Miopithecus ogouensis.

His description has been accepted as the formal description of the species. I'm sure the person most surprised by this is Mr Kingdon himself.
 
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Many of the primates named in the last 10 years have only been described as species because the authors follow the phylogenetic species concept. Same reason many primates that before were considered subspecies of one species now considered separate species instead. For example Colin Groves who published influential book "Primate Taxonomy", primate section in 3rd edition of "Mammal Species of the World. A Taxonomic and Geographic Reference" and also many papers on splits in primates follows the phylogenetic concept. 11 of the 15 Lepilemur species from 2006 were described in a single paper and are questionable even if following the phylogenetic species concept. Thats one of the main reasons why those 11 are Data Deficient in the IUCN Red List because they are still not convinced they are actual species. As they say for them all "Further work is now urgently needed to clarify the distribution and taxonomic limits of the recently described Lepilemur species". Ian Tattersall who is one of the people in the world that knows most about lemurs (he was one of the people who wrote the great book Lemurs of Madagascar) mentioned them specifically in a paper of his called "Madagascar's Lemurs: Cryptic diversity or taxonomic inflation?" Also many have assumed that for example rivers always were big barriers to lemurs but that's probably not correct (see paper "Large rivers do not always act as species barriers for Lepilemur sp." from journal "Primates" in 2009).
 
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