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Mouse Lemur
The mouse lemurs are nocturnal lemurs of the genus ''Microcebus''. Like all lemurs, mouse lemurs are native to Madagascar. Mouse lemurs have a combined head, body and tail length of and weigh , 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 two 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 18–11 million years ago. 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 po ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Madame Berthe's Mouse Lemur
Madame Berthe's mouse lemur (''Microcebus berthae'') or Berthe's mouse lemur is the smallest of the mouse lemurs and the smallest primate in the world; the average body length is and seasonal weight is around . ''Microcebus berthae'' is one of many species of Malagasy lemurs that came about through extensive speciation, caused by unknown environmental mechanisms and conditions. This primate is found chiefly in the Kirindy Forest in western Madagascar. After its discovery in 1992 in the dry deciduous forest of western Madagascar, it was initially thought to represent a rediscovery of '' M. myoxinus'', but comparative morphometric and genetic studies revealed its status as a new species, ''M. berthae''. This lemur is named after the conservationist and primatologist Berthe Rakotosamimanana of Madagascar, who was the Secretary General of the ''Groupe d'Etudes et de Recherche des Primates'' (GERP) from its founding until her death in 2005. Physical description ''Microcebus be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Goodman's Mouse Lemur
Goodman's mouse lemur (''Microcebus lehilahytsara'') is a species of mouse lemur from the region near Andasibe in eastern Madagascar Madagascar, officially the Republic of Madagascar, is an island country that includes the island of Madagascar and numerous smaller peripheral islands. Lying off the southeastern coast of Africa, it is the world's List of islands by area, f .... The species is named in honor of primatologist Steven M. Goodman. "Lehilahytsara" is a combination of the Malagasy words which mean "good" and "man". The finding was presented August 10, 2005, along with the discovery of the northern giant mouse lemur (''Mirza zaza'') as a separate species. Description Mouse lemurs are among the smallest primates, and Goodman's mouse lemur is no exception. Although not the smallest overall, Goodman's mouse lemur has a head-body length comparable to M. berthae which is the smallest known primate. The average size ranges from , with males being slightly larger t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Étienne Geoffroy Saint-Hilaire
Étienne Geoffroy Saint-Hilaire (; 15 April 177219 June 1844) was a French naturalist who established the principle of "unity of composition". He was a colleague of Jean-Baptiste Lamarck and expanded and defended Lamarck's evolutionary theories. Geoffroy's scientific views had a transcendental flavor (unlike Lamarck's materialistic views) and were similar to those of German morphologists like Lorenz Oken. He believed in the underlying unity of organismal design, and the possibility of the transmutation of species in time, amassing evidence for his claims through research in comparative anatomy, paleontology, and embryology. He is considered as a predecessor of the evo-devo evolutionary concept. Life and early career Geoffroy was born at Étampes (in present-day Essonne), and studied at the Collège de Navarre, in Paris, where he studied natural philosophy under M. J. Brisson. He then attended the lectures of Louis-Jean-Marie Daubenton at the College de France and Fourcroy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Testicle
A testicle or testis ( testes) is the gonad in all male bilaterians, including humans, and is Homology (biology), homologous to the ovary in females. Its primary functions are the production of sperm and the secretion of Androgen, androgens, primarily testosterone. The release of testosterone is regulated by luteinizing hormone (LH) from the anterior pituitary gland. Sperm production is controlled by follicle-stimulating hormone (FSH) from the anterior pituitary gland and by testosterone produced within the gonads. Structure Appearance Males have two testicles of similar size contained within the scrotum, which is an extension of the abdominal wall. Scrotal asymmetry, in which one testicle extends farther down into the scrotum than the other, is common. This is because of the differences in the vasculature's anatomy. For 85% of men, the right testis hangs lower than the left one. Measurement and volume The volume of the testicle can be estimated by palpating it and compari ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jonah's Mouse Lemur
''Microcebus jonahi'', or Jonah's mouse lemur, is a tiny species of primate. It weighs and has a body length of around and its tail measures around 13 cm as well. It is the 25th recognized species of mouse lemur and the 108th recognized species of lemur. Description Jonah's mouse lemur has small ears and the characteristic huge eyes of lemurs with a distinct white stripe between the eyes. It has short, dense fur with a white with slightly yellowish belly and a brownish back. It weighs and has a body length of around and its tail measures around 13 cm as well. Distribution Jonah's mouse lemur lives in northeastern Madagascar, including within the protected Mananara National Park. The species was named after Malagasy primatologist Dr. Jonah Ratsimbazafy. Conservation status The forested area in the region where the Jonah's mouse lemur is found is undergoing massive deforestation. In northeast Madagascar, forest cover declined from in the early 1990s to in 2018. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jolly's Mouse Lemur
Jolly's mouse lemur (''Microcebus jollyae'') is a species of mouse lemur from Mananjary and Kianjavato in Madagascar. The species is named in honor of primatologist Alison Jolly. Jolly's mouse lemur is uniformly reddish-brown with a small white patch on the snout and a completely gray belly. The finding was announced June 21, 2006 at the Conservation International Global Symposium in Antananarivo, Madagascar Madagascar, officially the Republic of Madagascar, is an island country that includes the island of Madagascar and numerous smaller peripheral islands. Lying off the southeastern coast of Africa, it is the world's List of islands by area, f ..., along with the discovery of Mittermeier's mouse lemur ''Microcebus mittermeieri'' and Simmons' mouse lemur ''Microcebus simmonsi'' as separate species. These new species were also officially announced in a paper in the ''International Journal of Primatology''. References {{Taxonbar, from=Q1206248 Mammals described i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reddish-gray Mouse Lemur
The reddish-gray mouse lemur (''Microcebus griseorufus'') also known as the gray-brown mouse lemur or rufous-gray mouse lemur, is a small, solitary-but-social, nocturnal and omnivorous primate from the Western Madagascar in the region around Beza Mahafaly Reserve, north to Lamboharana. Like the other lemur species, the reddish-grey mouse lemur is endemic to Madagascar. They generally live in the drier regions of the island. It is categorized as least concerned in the IUCN Red List. Appearance and morphology ''Microcebus griseorufus'' has a pelage color that is alternating light neutral gray, pale neutral gray, and light pale neutral gray dorsally and ventrally light grayish-white on the anterior two-thirds and bicolored light grayish-white and pale neutral gray on the posterior one-third. It has a cinnamon colored dorsal stripe running from the crown of the head or the shoulders to the end of the tail. The head of this species has a pale neutral gray spot above the nose, cinn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gerp's Mouse Lemur
Gerp's mouse lemur (''Microcebus gerpi'') is a species of mouse lemur known only from the Sahafina Forest in eastern Madagascar, near Mantadia National Park. Its discovery was announced in 2012 by a German and Malagasy research team. The Sahafina Forest had not been studied until 2008 and 2009, when Groupe d'Étude et de Recherche sur les Primates de Madagascar (GERP)—a Malagasy-based research and conservation group for which the lemur is named—inventoried the forest's lemurs. Based on genetic studies, measurements, and photos, the research team confirmed the Gerp's mouse lemur was an undescribed species, distinct from Goodman's mouse lemur, which is found away. Gerp's mouse lemur is significantly larger, weighing on average , compared to Goodman's mouse lemur, which weighs about . Jolly's mouse lemur, which is its closest relative and a neighbor to the south, is comparably larger, but differs in tail length and genetics. Because it is a recently discovered species, l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ganzhorn's Mouse Lemur
Ganzhorn's mouse lemur (''Microcebus ganzhorni'') is a species of lemur described in 2016. The discovery was made by researchers at the German Primate Center. It was discovered in Madagascar among closely related species such as Madame Berthe's mouse lemur, already described in 2013. Due to their close resemblance, it was initially impossible to identify them as distinct species. It was only after genetic analyses (mtDNA sequencing) that the species was established. The genetic study was done in collaboration with scientists at the University of Kentucky, the Duke Lemur Center and the University of Antananarivo in Madagascar. The species is named after Professor Jörg Ganzhorn of Hamburg University The University of Hamburg (, also referred to as UHH) is a public research university in Hamburg, Germany. It was founded on 28 March 1919 by combining the previous General Lecture System ('' Allgemeines Vorlesungswesen''), the Hamburg Colon ..., who had pioneered the research ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Danfoss' Mouse Lemur
Danfoss's mouse lemur (''Microcebus danfossi''), or the Ambarijeby mouse lemur, is a species of mouse lemur endemic to Madagascar. It lives in western deciduous forest within a limited range between the Sofia River and the Maevarano River. This species has been found in substantial populations in the Ambarijevy, Anjajavy, and Beanamaolo forests in Madagascar. Their lifespan is about 5 years but can live up to 10 years. They are part of the infraorder called lemuriformes which represents 20% of the entire primates diversity and over 60% of the mammalian genera of Madagascar. There is no current estimate of the number of individuals present in the wild, nor in captivity. However the IUCN red list provides the number of 2.2 to 5 individuals per hectares as the species density and that its population is decreasing. Habitat Their average individual home range from of dry deciduous forests elevated up to . Their habitat can be separated into sixteen forest fragments. They tend to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boraha Mouse Lemur
The Nosy Boraha mouse lemur (''Microcebus boraha'') is a species of mouse lemur described in 2016 from Madagascar. It was discovered by a team of researchers at the German Primate Center. It was initially discovered among closely related species such as Madame Berthe's mouse lemur (already described in 2013), Bemanasy mouse lemur, and Ganzhorn's mouse lemur. Morphological similarity made it impossible to identify them as distinct species. A genetic study was done in collaboration with scientists at the University of Kentucky, the Duke Lemur Center and the University of Antananarivo in Madagascar. The mtDNA Mitochondrial DNA (mtDNA and mDNA) is the DNA located in the mitochondria organelles in a eukaryotic cell that converts chemical energy from food into adenosine triphosphate (ATP). Mitochondrial DNA is a small portion of the DNA contained in ... sequencing revealed that the species was unique. The species is named after its natural habitat Malagasy Nosy Boraha on the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nature (journal)
''Nature'' is a British weekly scientific journal founded and based in London, England. As a multidisciplinary publication, ''Nature'' features Peer review, peer-reviewed research from a variety of academic disciplines, mainly in science and technology. It has core editorial offices across the United States, continental Europe, and Asia under the international scientific publishing company Springer Nature. ''Nature'' was one of the world's most cited scientific journals by the Science Edition of the 2022 ''Journal Citation Reports'' (with an ascribed impact factor of 50.5), making it one of the world's most-read and most prestigious academic journals. , it claimed an online readership of about three million unique readers per month. Founded in the autumn of 1869, ''Nature'' was first circulated by Norman Lockyer and Alexander MacMillan (publisher), Alexander MacMillan as a public forum for scientific innovations. The mid-20th century facilitated an editorial expansion for the j ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
