|Pygmy mouse lemur (M. myoxinus)|
É. Geoffroy, 1834
|About 24 species|
|Combined distribution of Microcebus|
Mouse lemurs have a combined head, body and tail length of less than 27 centimetres (11 in), making them the smallest primates (the smallest species being Madame Berthe's mouse lemur); however, their weight fluctuates in response to daylight duration. Lemurs and Mouse Lemurs were announced by the IUCN as the most endangered of all vertebrates. There were 2 known mouse lemur species in 1992; by 2016, there were 24.  It was estimated that the 24 mouse lemur species evolved from a common ancestor 10 million years ago. Evolution of mouse lemurs is an example for adaptive radiation.
Mouse lemurs are omnivorous; their diets are diverse and include insect secretions, arthropods, small vertebrates, gum, fruit, flowers, nectar, and also leaves and buds depending on the season.
Mouse lemurs are considered cryptic species - with very little morphological differences between the various species, but with high genetic diversity. Recent evidence points to differences in their mating calls, which is very diverse. Since mouse lemurs are nocturnal, they might not have evolved to look differently, but had evolved various auditory and vocal systems.
Mouse lemurs have the smallest known brain of any primate, at just 0.004 pounds (2 grams).
As written in Genetics, mouse lemurs help to provide a more extensive understanding of the biology, behavior, and health of primates. Due to their fascinating genetic similarities to both humans and mice, mouse lemurs are categorized as prosimian primates. They are among the smallest and most rapidly developing primates and are becoming more abundant in Madagascar and around the world. These tiny creatures are helping to prove valuable information about the biology and evolution of primates through the analysis of their phenotypes and mutations. 
Reproduction and evolutionEdit
Mouse lemurs are also known for their sperm competition. During breeding seasons, the testicles of male mouse lemurs increase in size to about 130% of their normal size. This was speculated to increase the sperm production thereby conferring an advantage for the individual to bear more offspring. There are various hypotheses relating the rapid evolution of mouse lemur species to this sperm competition. In sexually inactive females the vulva is sealed, during the reproductive cycle the vulva is open. The vaginal morphology is also based on the time of day.
- Genus Microcebus: mouse lemurs
- Gray mouse lemur, Microcebus murinus
- Reddish-gray mouse lemur, M. griseorufus
- Golden-brown mouse lemur, M. ravelobensis
- Northern rufous mouse lemur, M. tavaratra
- Sambirano mouse lemur, M. sambiranensis
- Simmons' mouse lemur, M. simmonsi
- Pygmy mouse lemur, M. myoxinus
- Brown mouse lemur, M. rufus
- Madame Berthe's mouse lemur, M. berthae
- Goodman's mouse lemur, M. lehilahytsara
- Jolly's mouse lemur, M. jollyae
- MacArthur's mouse lemur, M. macarthurii 
- Mittermeier's mouse lemur, M. mittermeieri
- Claire's mouse lemur, M. mamiratra, synonymous to M. lokobensis 
- Bongolava mouse lemur M. bongolavensis 
- Danfoss' mouse lemur M. danfossi 
- Arnhold's mouse lemur, M. arnholdi 
- Margot Marsh's mouse lemur, M. margotmarshae 
- Gerp's mouse lemur. M. gerpi
- Anosy mouse lemur. M. tanosi
- Marohita mouse lemur. M. marohita
- Ganzhorn's mouse lemur. M. ganzhorni 
- Boraha mouse lemur Microcebus boraha 
- Microcebus manitatra 
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