Lemurs are strepsirrhine primates, all species of which are endemic to Madagascar. They include the smallest primate in the world, Madame Berthe's mouse lemur, which weighs 30 grams (1.1oz), and range up to the size of the indri, which can weigh as much as 9.5 kilograms (21lb). However, recently extinct species grew much larger. As of 2010, five families, 15genera, and 101species and subspecies of lemur were formally recognized.[1] From 2000 through 2008, 39new species were described and nine other taxa resurrected.[2] By 2014, the number of species plus subspecies recognized had increased to 113; of the 105 species then known, the IUCN classified 24as critically endangered, 49as endangered, 20as vulnerable, three as near threatened, three as least concern and four as data deficient; two were yet to be evaluated.
The ring-tailed lemur (Lemur catta) is one of over 100 recognized species of lemur, all found only in Madagascar.
The number of lemur species is likely to continue growing in the coming years, as field studies, cytogenetic and molecular genetic research continues.[2] There is not complete agreement over the latest revisions to lemur taxonomy, with some experts preferring an estimated 50lemur species.[3] The debates are likely to continue, as some scholars label the explosive growth of species numbers as taxonomic inflation. In many cases, classifications will ultimately depend upon which species concept is used.[4] In the case of the lemurs of Madagascar, which have suffered extensively from deforestation and habitat fragmentation, nearly 70% of all species were either endangered or critically endangered as of 2014, most have yet to be extensively studied, and nearly all populations are in decline. For these reasons, taxonomists and conservationists favor splitting them into separate species to develop an effective strategy for the conservation of the full range of lemur diversity.[2] Implicitly, this means that full species status will help grant genetically distinct populations added environmental protection.
At least 17species and eight genera are believed to have become extinct in the 2,000 years since humans first arrived in Madagascar.[5][6] All known extinct species were large, ranging in weight from 10 to 200kg (22 to 441lb). The largest known subfossil lemur was Archaeoindris fontoynonti, a giant sloth lemur, which weighed more than a modern female gorilla. The extinction of the largest lemurs is often attributed to predation by humans and possibly habitat destruction.[5] Since all extinct lemurs were not only large (and thus ideal prey species), but also slow-moving (and thus more vulnerable to human predation), their presumably slow-reproducing and low-density populations were least likely to survive the introduction of humans.[5] Gradual changes in climate have also been blamed, and may have played a minor role; however since the largest lemurs also survived the climatic changes from previous ice ages and only disappeared following the arrival of humans, it is unlikely that climatic change was largely responsible.[5]
There is strong evidence of extensive declines in extant populations since the introductions of humans, particularly among the larger and more specialized lemurs.[5] As long as habitats continue to shrink, degrade and fragment, extinctions are likely to continue.
Taxonomic classification
Main article: Taxonomy of lemurs
Lemurs are classified under eight families, three of which are extinct:
The silky sifaka, one of the most endangered primates in the world.Mouse lemurs are the smallest primates in the world.As of 2014 there are 5species and 3subspecies of bamboo lemurs recognized.
The placement of lemurs within the order Strepsirrhini is currently under debate, although both sides agree upon the same phylogenetic tree.[7]
Order Primates
Suborder Strepsirrhini: lemurs, galagos, and lorisids
Infraorder Lemuriformes
Superfamily Lemuroidea
Family †Archaeolemuridae
Family Cheirogaleidae
Family Daubentoniidae
Family Indriidae
Family Lemuridae
Family Lepilemuridae
Family †Megaladapidae
Family †Palaeopropithecidae
Superfamily Lorisoidea
Suborder Haplorrhini: tarsiers, monkeys and apes
Key
Scientific name
Latin binomial name, or Latin name, of the species
Common name
Common name of the species, per Wilson, et al.Mammal Species of the World (2005) or Mittermeier, et al. "Lemur Diversity in Madagascar" (2008)
Family
Family within the Suborder Strepsirrhini to which the species belongs
Classified
Date in which the species was formally described and classified, as well as the binomial authority on the species
Average size
Average size of adult members of the species, in metric and English weight units
Estimated size
Estimated Average size of adult members of the extinct species
Conservation status
Conservation status of the species, per IUCN as of 2008
Extant species
Main article: Lemur
All lemurs belong to the suborder Strepsirrhini within the order Primates. The 101extant species and subspecies are divided among 5 families and 15 genera. They range in weight from 30g (1.1oz) (Madame Berthe's mouse lemur) to as much as 9.5kg (21lb) (indri). Most are highly arboreal and activity patterns range widely from nocturnal to diurnal to cathemeral. Having diversified over millions of years to fill every ecological niche, diets also vary widely, though fruit, leaves, and insects make up the majority of the diet for most species.
Family: Cheirogaleidae
Family Cheirogaleidae consists of the mouse lemurs (smallest of all primates), the dwarf lemurs, and the fork-marked lemurs and their allies. There are 37extant species.
The gray mouse lemur is one of as many as 21 tiny, nocturnal mouse lemur species.Fork-marked lemurs are the among the largest of the cheirogaleids.
Family Lemuridae consists of the ring-tailed lemur, the brown lemurs, the bamboo lemurs and the ruffed lemurs. There are 21extant species and six subspecies.
The red-fronted lemur, like other brown lemurs, is sexually dichromatic (the sexes have different colorations).The ring-tailed lemur is highly social and is the most popularly known lemur species.Ruffed lemurs are the largest of the extant lemurids.
Family Indriidae consists of the indri (the largest extant lemur), the woolly lemurs and the sifakas. There are 19extant species.
The indri is one of the two largest extant lemurs.Sifakas are vertical clingers and jumpers and are represented by 9 species, 8 of which are considered critically endangered as of 2020.
The aye-aye has many physical traits unique for a primate and is monotypic within its family.
Family Daubentoniidae contains only one surviving species, of the aye-aye. Wide-ranging genetic studies have shown that it separated from the ancestral lemurs long before any other branch of the modern Lemuriformes.[2]
Reports of new species continue to trickle in from the field. However, these reports require further scientific evaluation before their claims can be verified.
Extinct species
Main article: Subfossil lemur
All known extinct lemurs from Madagascar are known from recent, subfossil remains.[278] Conditions for fossilization were not ideal on the island, so little is known about ancestral lemur populations. All known extinct lemurs are thought to have died out after the arrival of humans.
aIn 2008, the red lemur, Eulemur rufus, was split into two species, Eulemur rufus (red lemur) and Eulemur rufifrons (red-fronted lemur). Also, Eulemur rufus was previously known as the red-fronted lemur, but was renamed the red lemur, while Eulemur rufifrons assumed its former name.[2]
bFormerly referred to as Eulemur albocollaris or white-collared brown lemur, but was changed in 2008.[2]
cThis extinction date for Babakotia radofilai is based on a single radiocarbon date from one specimen. For this reason, it is hard to tell when this species became extinct or how it is related to other lemur species.[279]
dAverage weights reported for this species are based on very small sample sizes or are general ranges for its genus and thus require further research.
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