Smallest organisms - wikipedia Smallest organisms This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. ( July 2015 ) The smallest organisms found on Earth can be determined according to various aspects of organism size ; including volume, mass, height, length, or genome size. Given the incomplete nature of scientific knowledge, it is possible that the smallest organism is undiscovered. Furthermore, there is some debate over the definition of life, and what entities qualify as organisms ; consequently the smallest known organism ( microorganism ) is debatable. Contents 1 Microorganisms 1.1 Viruses 1.2 Obligate endosymbiotic bacteria 1.3 Pelagibacter ubique 1.4 Mycoplasma genitalium 1.5 Nanoarchaeum 1.6 Gowon 2 Animals 2.1 Molluscs 2.2 Arthropods 2.2. 1 Smallest crustacean 2.2. 2 Arachnids 2.2. 3 Insects 2.3 Echinoderms 2.3. 1 Sea urchins 2.3. 2 Starfish 2.4 Vertebrates 2.5 Fish 2.6 Amphibians 2.6. 1 Salamanders 2.6. 2 Frogs 2.7 Reptiles 2.7. 1 Lizards 2.7. 2 Turtles 2.7. 3 Crocodilians 2.7. 4 Snakes 2.8 Dinosaurs 2.8. 1 Birds 2.9 Mammals 2.9. 1 Rodents 2.9. 2 Carnivorans 2.9. 3 Marsupials 2.9. 4 Primates 2.9. 5 Cetaceans 3 Plants 3.1 Flowering plants ( angiosperms ) 4 Other 4.1 Nanobes 5 See also 6 References 7 External links Microorganisms Viruses Many biologists consider viruses to be non-living because they lack a cellular structure and can not metabolize by themselves, requiring a host cell to replicate and synthesize new products. A minority of scientists hold that, because viruses do have genetic material and can employ the metabolism of their host, they can be considered organisms. As well, an emerging idea that is gaining traction among some virologists is the concept of the virocell, in which the actual phenotype of a virus is the infected cell, and the virus particle is simply a reproductive or dispersal stage, much like pollen or a spore. The smallest viruses in terms of genome size are single - stranded DNA ( ssDNA ) viruses. Perhaps the most famous is the bacteriophage Phi - X174 with a genome size of 5386 nucleotides. However, some ssDNA viruses can be even smaller. For example, Porcine circovirus type 1 has a genome of only 1759 nucleotides and a capsid diameter of only 17 nm. As a whole, the viral family geminiviridae is only about 30 nm in length. However, the two capsids making up the virus are fused ; divided, the capsids would be 15 nm in length. Other environmentally characterized ssDNA viruses such as CRESS DNA viruses as well as others can have genomes that are considerably less that 2,000 nucleotides. The smallest RNA viruses in terms of genome size are small retroviruses such as rous sarcoma virus with genomes of 3.5 kilo base pairs ( kb ) and particle diameters of 80 nanometres ( nm ). The smallest double stranded DNA viruses are the hepadnaviruses such as Hepatitis B, at 3.2 kb and 42 nm ; parvoviruses have smaller capsids, at 18 - 26 nm, but larger genomes, at 5 kb. It is important to consider other self replicating genetic elements, such as satelliviruses, viroids and ribozymes. Obligate endosymbiotic bacteria The genome of Nasuia deltocephalinicola, a symbiont of the European pest leafhopper, Macrosteles quadripunctulatus consists of a circular chromosome of 112,031 base pairs. Nanoarchaeum equitans 's genome is 490,885 nucleotides long. Pelagibacter ubique Pelagibacter ubique is one of the smallest known free - living bacterium with a length of 0.37 - 0.89 μm and an average cell diameter of 0.12 - 0.20 μm. They also have the smallest free - living bacterium genome ; 1.8 Mbp, 1354 protein genes, 35 RNA genes. They are one of the most common and smallest organisms in the ocean, with their total weight equaling more than all fish presently in the sea. Mycoplasma genitalium Mycoplasma genitalium, a parasitic bacterium which lives in the primate bladder, waste disposal organs, genital, and respiratory tracts, is thought to be the smallest known organism capable of independent growth and reproduction. With a size of approximately 200 to 300 nm, M. genitalium is an ultramicrobacterium, smaller than other small bacteria, including rickettsia and chlamydia. However, the vast majority of bacterial strains have not been studied, and the marine ultramicrobacteria Sphingomonas sp strain RB2256 is reported to have passed through a 220 nm ultrafilter. A complicating factor is nutrient - downsized bacteria, bacteria that become much smaller due to a lack of available nutrients. Nanoarchaeum equitans and archaeon host, Ignicoccus Nanoarchaeum Nanoarchaeum equitans is a species of tiny microbe 400 nm in diameter. It was discovered in 2002 in a hydrothermal vent off the coast of Iceland by Karl Stetter. A thermophile that grows in near - boiling temperatures, Nanoarchaeum appears to be an obligatory symbiont on the archaeon Ignicoccus ; it must be in contact with the host organism to survive. Gowon Prasinophyte algae of the genus Ostreococcus is the smallest free - living eukaryote. The single cell of an Ostreococcus measures only 0.8 μm across. Animals Several species of Myxozoa never grow larger than 20 μm. One of the smallest species ( Myxobolus shekel ) is no more than 8.5 μm when fully grown. Molluscs The smallest water snail ( of all snails ) is Ammonicera minortalis in North America, originally described from Cuba. It measures 0.32 to 0.46 mm. The smallest land snail is Acmella nana. Discovered in Borneo, Malaysia, and described in November 2015, it measures only 0.7 mm. The previous record was that of Angustopila dominikae from China, which was reported in September 2015. This snail measures 0.86 mm. Arthropods Smallest crustacean The smallest crustacean, and indeed the smallest arthropod, is the tantulocarid Stygotantulus stocki, at a length of only 94 μm ( 0.0037 in ). Arachnids Eriophyid mites measure 125 to 250 μm in length. Insects Adult males of the parasitic wasp Dicopomorpha echmepterygis can be as small as 139 μm long, smaller than some species of protozoa ( single - cell creatures ) ; females are 40 percent larger. Megaphragma caribea from Guadeloupe, measuring 170 μm long, is another contender for smallest known insect in the world. Beetles Beetles of the tribe Nanosellini are all less than 1 mm long ; the smallest confirmed specimen is of Scydosella musawasensis at 325 μm long ; a few other nanosellines are reportedly smaller, in historical literature, but none of these records have been confirmed using accurate modern tools. These are among the tiniest non-parasitic insects. Butterflies Grand Cayman pygmy blue ( Brephidium exilis thompsoni ) The western pygmy blue ( Brephidium exilis ) is one of the smallest butterflies in the world. Echinoderms The smallest sea cucumber, and also the smallest echinoderm, is Psammothuria ganapati, a synaptid that lives between sand grains on the coast of India. Its maximum length is only 4 mm. Sea urchins The smallest sea urchin, Echinocyamus scaber, has a test only 6 mm across. Starfish Patiriella parvivipara is the smallest starfish, at only 5 mm across. Vertebrates Paratype of Paedophryne amauensis ( LSUMZ 95004 ) on a US dime. The smallest vertebrates ( and smallest amphibians ) known are Paedophryne amauensis frogs from Papua New Guinea, which range in length from 7.0 -- 8.0 millimetres ( 0.28 -- 0.31 in ), and average 7.7 millimetres ( 0.30 in ). Previously, the title of smallest vertebrate was held by members of the fish genus Paedocypris of Indonesia. Fish Main article : List of smallest fish The world 's smallest fish based on the minimum size at maturity is Paedocypris progenetica from Indonesia, with mature females measuring as little as 7.9 mm ( 0.31 in ) in standard length. This fish, a member of the carp family, has a translucent body and a head unprotected by a skeleton. Male individuals of the anglerfish species Photocorynus spiniceps have been documented to be 6.2 -- 7.3 millimetres ( 0.24 -- 0.29 in ) at maturity, and thus claimed to be a smaller species. However, these survive only by sexual parasitism and the female individuals reach the significantly larger size of 50.5 millimetres ( 1.99 in ). Amphibians Salamanders The average snout - to - vent length of several specimens of the salamander Thorius arboreus was only 17 millimetres ( 0.67 in ). Frogs Frogs include the smallest vertebrates known. The smallest known frog species is Paedophryne amauensis, with a snout - vent length reported as 7.7 mm, which occurs among leaf - litter in the tropical montane forests of New Guinea. Other very small frogs include Brachycephalus didactylus from Brazil ( reported as 9.6 - 9.8 mm ), several species of Eleutherodactylus such as Eleutherodactylus iberia ( around 10mm ) from Cuba, Gardiner 's Frog Sechellophryne gardineri from the Seychelles ( up to 11 mm ), several species of Stumpffia such as Stumpffia tridactyla and Stumpffia pygmaea from Madagascar, and the Rough Moss - frog Arthroleptella rugosa of South Africa ( 11.9 - 14.1 mm ). In general these extremely small frogs occur in tropical forest and montane environments. There is relatively little data on size variation among individuals, growth from metamorphosis to adulthood or size variation among populations in these species. Additional studies and the discovery of further minute frog species are likely to change the rank order of this list. Reptiles Lizards A juvenile Brookesia micra on a finger tip The dwarf gecko ( Sphaerodactylus ariasae ) and the Virgin Islands dwarf sphaero ( S. parthenopion ), two geckos in the genus Sphaerodactylus, are the world 's smallest known reptile species and smallest lizard, with a snout - vent length of 16 millimetres ( 0.63 in ). A few Brookesia chameleons from Madagascar are equally small, with a reported snout - vent length of 15 -- 18 millimetres for male dwarf chameleons ( B. minima ), 14 -- 19 millimetres for male Mount d'Ambre leaf chameleons ( B. tuberculata ) and 15 -- 16 millimetres for male B. micra, though females are larger. Of the aforementioned geckos, S. ariasae was first described in 2001 by the biologists Blair Hedges and Richard Thomas. This dwarf gecko is endangered and lives in Jaragua National Park in the Dominican Republic and on Beata Island ( Isla Beata ), off the southern coast of Hispaniola in the Dominican Republic. Turtles The world 's smallest turtle is the speckled padloper tortoise ( Homopus signatus ) from South Africa. The males measure 6 -- 8 cm ( 2.4 -- 3.1 in ), while females measure up to almost 10 cm ( 3.9 in ). CROCODILIANS The smallest crocodilian is the Cuvier 's dwarf caiman ( Paleosuchus palpebrosus ) from northern and central South America. It reaches up to 1.6 m ( 5.2 ft ) in length. Snakes One of the smallest snakes known is the recently discovered Barbados threadsnake ( Leptotyphlops carlae ). Adults average about 10 cm ( 3.9 in ) long, which is only about twice as long as the hatchlings. Dinosaurs The smallest known dinosaur ( excluding modern birds ) is Anchiornis, a genus of feathered dinosaur that lived in what is now China during the Late Jurassic Period 160 to 155 million years ago. Adult specimens range from 34 cm ( 13 in ) long, and the weight has been estimated at up to 110 g ( 3.9 oz ). Nevertheless, sizes of dinosaurs are commonly labelled with a level of uncertainty, as the available material often ( or even usually ) is incomplete. Birds Bee hummingbird ( Mellisuga helenae ) immature male With a mass of approximately 1.8 grams ( 0.063 oz ) and a length of 5 centimetres ( 2.0 in ), the bee hummingbird ( Mellisuga helenae ) is the world 's smallest bird species and the smallest warm - blooded vertebrate. Called the zunzún in its native habitat on Cuba, it is lighter than a Canadian or U.S. penny. It is said that it is `` more apt to be mistaken for a bee than a bird ''. The bee hummingbird eats half its total body mass and drinks eight times its total body mass each day. Its nest is 3 cm across. Mammals The vulnerable Kitti 's hog - nosed bat ( Craseonycteris thonglongyai ), also known as the bumblebee bat, from Thailand and Myanmar is the smallest mammal, at 3 -- 4 centimetres ( 1.2 -- 1.6 in ) in length and 1.5 -- 2 grams ( 0.053 -- 0.071 oz ) in weight. The Etruscan shrew ( Suncus etruscus ), is the smallest mammal by mass, weighing only about 1.8 grams ( 0.063 oz ) on average. The bumblebee bat has a smaller skull size. The smallest mammal that ever lived, the shrew - like Batodonoides vanhouteni, weighed only 1.3 grams ( 0.046 oz ). Rodents The smallest member of the rodent order is the Baluchistan pygmy jerboa, with an average body length of only 4.4 cm ( 1.7 in ). Carnivorans The smallest member of the order Carnivora is the least weasel ( Mustela nivalis ), with an average body length of 114 -- 260 mm ( 4.5 - 10.2 in ). It weighs between 29.5 -- 250 grams with females being lighter. Marsupials The smallest marsupial is the Long - tailed planigale from Australia. It has a body length of 110 -- 130 millimetres ( 4.3 -- 5.1 in ) ( including tail ) and weigh 4.3 grams ( 0.15 oz ) on average. The Pilbara ningaui is considered to be of similar size and weight. Primates The smallest member of the primate order is Madame Berthe 's mouse lemur ( Microcebus berthae ), found in Madagascar, with an average body length of 92 mm ( 3.6 in ). Cetaceans The smallest cetacean, which is also ( as of 2006 ) the most endangered, is the vaquita. Male vaquitas grow to an average of around 135 cm ( 53 in ) ; the females are slightly longer, averaging about 141 cm ( 55 in ) in length. Plants Flowering plants ( angiosperms ) Wolffia arrhiza on human fingers. Every speck of less than 1 mm length is an individual plant. Duckweeds of the genus Wolffia are the world 's smallest flowering plants. Fully grown, they measure only 300 μm by 600 μm and reach a mass of just 150 μg. Other Nanobes Nanobes are thought by some scientists to be the smallest known organisms about one tenth the size of the smallest known bacteria. Nanobes, tiny filamental structures first found in some rocks and sediments, were first described in 1996 by Philippa Uwins of the University of Queensland. See also Human timeline Largest organisms Largest prehistoric organisms Life timeline Nature timeline References Jump up ^ P. Forterre ( 2012 ). `` The virocell concept and environmental microbiology ''. The ISME Journa. 7 : 233 -- 236. doi : 10.1038 / ismej. 2012.110. Jump up ^ Sanger, F. ; Air, G.M. ; Barrell, B.G. ; Brown, N.L. ; Coulson, A.R. ; Fiddes, J.C. ; Hutchison, C.A. ; Slocombe, P.M. ; Smith, M. ( 1977 ). `` Nucleotide sequence of bacteriophage ΦX174 DNA ''. 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External links featherwing beetles on the UF / IFAS Featured Creatures Web site Retrieved from `` https://en.wikipedia.org/w/index.php?title=Smallest_organisms&oldid=837229232 '' Categories : Organism size Biological records Hidden categories : Webarchive template wayback links Articles with inconsistent citation formats Webarchive template archiveis links Articles needing additional references from July 2015 All articles needing additional references Talk Contents About Wikipedia Español Русский தமிழ் Українська Edit links This page was last edited on 19 April 2018, at 14 : 36. Text is available under the Creative Commons Attribution - ShareAlike License ; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia ® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. About Wikipedia

Question: what is the smallest land animal in the world
Answer: Paedophryne amauensis frogs