Question: How many known subspecies are there of the lemur classified by a German naturalist and botanist ?

text: List of lemur species
Extant species -- Family : Lemuridae
Family Lemuridae consists of the ring-tailed lemur , the brown lemurs , the bamboo lemurs and the ruffed lemurs . There are 21 extant 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 .
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 (1.1 oz), and range up to the size of the indri, which can weigh as much as 9.5 kilograms (21 lb). However, recently extinct species grew much larger. As of 2010, five families, 15 genera, and 101 species and subspecies of lemur were formally recognized. From 2000 through 2008, 39 new species were described and nine other taxa resurrected. By 2014, the number of species and subspecies recognized had increased to 113; of these, the IUCN classified 24 as Critically Endangered, 49 as Endangered, 20 as Vulnerable, three as Near Threatened, three as Least Concern and four as Data Deficient; two were yet to be evaluated. The number of lemur species is likely to continue growing in the coming years, as field studies, cytogenetic and molecular genetic research continues. There is not complete agreement over the latest revisions to lemur taxonomy, with some experts preferring an estimated 50 lemur species. 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. In the case of the lemurs of Madagascar, which have suffered extensively from deforestation and habitat fragmentation, nearly 25% of all species are either Endangered or Critically Endangered, 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.
Scientific name Common name Classified Average size Conservation status
Eulemur albifrons White-fronted brown lemur 1796 , É. Geoffroy 2.2-2.6 kg ( 4.9-5.7 lb ) Endangered
Eulemur cinereiceps Gray-headed lemur 1890 , Grandidier and Milne-Edwards 2-2.5 kg ( 4.4-5.5 lb ) Critically Endangered
Eulemur collaris Collared brown lemur 1812 , É. Geoffroy 2.25-2.5 kg ( 5.0-5.5 lb ) Endangered
Eulemur coronatus Crowned lemur 1842 , Gray 1.1-1.3 kg ( 2.4-2.9 lb ) Endangered
Eulemur flavifrons Blue-eyed black lemur 1867 , Gray 1.8-1.9 kg ( 4.0-4.2 lb ) Critically Endangered
Eulemur fulvus Common brown lemur 1812 , É. Geoffroy 2-3 kg ( 4.4-6.6 lb ) Near Threatened
Eulemur macaco Black lemur 1766 , Linnaeus 2-2.9 kg ( 4.4-6.4 lb ) Vulnerable
Eulemur mongoz Mongoose lemur 1766 , Linnaeus 1.1-1.6 kg ( 2.4-3.5 lb ) Critically Endangered
Eulemur rubriventer Red-bellied lemur 1850 , I. Geoffroy 1.6-2.4 kg ( 3.5-5.3 lb ) Vulnerable
Eulemur rufifrons Red-fronted lemur 1833 , Bennett 2.2-2.3 kg ( 4.9-5.1 lb ) Near Threatened
Eulemur rufus Red lemur 1799 , Audebert 2.2-2.3 kg ( 4.9-5.1 lb ) Vulnerable
Eulemur sanfordi Sanford 's brown lemur 1932 , Archbold 1.8-1.9 kg ( 4.0-4.2 lb ) Endangered
Hapalemur alaotrensis Lac Alaotra bamboo lemur 1975 , Rumpler 1.1-1.4 kg ( 2.4-3.1 lb ) Critically Endangered
Hapalemur aureus Golden bamboo lemur 1987 , Meier et al 1.3-1.7 kg ( 2.9-3.7 lb ) Critically Endangered
Hapalemur griseus gilberti Beanamalao bamboo lemur 2007 , Rabarivola et al 0.967 kg ( 2.13 lb ) Endangered
Hapalemur griseus griseus Eastern lesser bamboo lemur 1795 , Link 0.7-1 kg ( 1.5-2.2 lb ) Vulnerable
Hapalemur griseus ranomafanensis Ranomafana bamboo lemur 2007 , Rabarivola et al 0.7-0.85 kg ( 1.5-1.9 lb ) Data Deficient
Hapalemur meridionalis Southern lesser bamboo lemur 1987 , Warter , et al 0.75-1.05 kg ( 1.7-2.3 lb ) Vulnerable
Hapalemur occidentalis Western lesser bamboo lemur 1975 , Rumpler 1 kg ( 2.2 lb ) Vulnerable
Lemur catta Ring-tailed lemur 1756 , Linnaeus 2.3-3.5 kg ( 5.1-7.7 lb ) Endangered