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Largest organisms

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This article lists the largest organisms for various types of life and mostly considers extant species,[a] which found on Earth can be determined according to various aspects of an organism's size, such as: mass, volume, area, length, height, or even genome size. Some organisms group together to form a superorganism (such as ants or bees), but such are not classed as single large organisms. The Great Barrier Reef is the world's largest structure composed of living entities, stretching 2,000 km (1,200 mi) but contains many organisms of many types of species.

Although it appears to be multiple trees, Pando is a clonal colony of an individual quaking aspen with an interconnected root system. It is widely held to be the world's most massive single organism.

When considering singular entities, the largest organisms are clonal colonies which can spread over large areas. Pando, a clonal colony of the quaking aspen tree, is widely considered to be the largest such organism by mass.[1] Even if such colonies are excluded, trees retain their dominance of this listing, with the giant sequoia being the most massive tree.[2] In 2006, a huge clonal colony of the seagrass Posidonia oceanica was discovered south of the island of Ibiza. At 8 kilometres (5 mi) across, and estimated at 100,000 years old,[3] it may be one of the largest and oldest clonal colonies on Earth.[4][5][6]

Among animals, the largest species are all marine mammals, specifically whales. The blue whale is believed to be the largest animal to have ever lived.[7] The living land animal classification is also dominated by mammals, with the African bush elephant being the largest of these.

Plants

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Main article: List of largest plants

The largest single-stem tree by wood volume and mass is the giant sequoia (Sequoiadendron giganteum), native to Sierra Nevada and California; it typically grows to a height of 70–85 m (230–280 ft) and 5–7 m (16–23 ft) in diameter.

The largest organism in the world, according to mass, is the aspen tree whose colonies of clones can grow up to 8 kilometres (5 mi) in size. The largest such colony is Pando, in the Fishlake National Forest in Utah.

A form of flowering plant that far exceeds Pando as the largest organism on Earth in area and potentially also mass, is the giant marine plant, Posidonia australis, living in Shark Bay, Australia. Its length is about 180 km (112 mi) and it covers an area of 200 km2 (77 sq mi).[8][9] It is also among the oldest known clonal plants.

Another giant marine plant of the genus Posidonia, Posidonia oceanica discovered in the Mediterranean near the Balearic Islands, Spain may be the oldest living organism in the world, with an estimated age of 100,000 years.[10]

The largest individual flower in the world is Rafflesia arnoldii, while the flowering plant with the largest unbranched inflorescence in the world is Amorphophallus titanum. Both are native to Sumatra in Indonesia.

Green algae

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Green algae are photosynthetic unicellular and multicellular green plants that are related to land plants. The thallus of the unicellular mermaid's wineglass, Acetabularia, can grow to several inches (perhaps 0.1 to 0.2 m) in length. The fronds of the similarly unicellular, and invasive Caulerpa taxifolia can grow up to a foot (0.3 m) long.[citation needed]

Animals

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The blue whale is the largest animal alive today.
 
Bruhathkayosaurus is potentially the largest animal to have walked the earth.
This section is an excerpt from Largest and heaviest animals.[edit]
 
 
 
Clockwise from top left: an African bush elephant, the largest extant terrestrial animal; a blue whale, the largest animal ever to exist; and a colossal squid, the largest invertebrate

The largest animal currently alive is the blue whale. The maximum recorded weight was 190 tonnes (209 US tons) for a specimen measuring 27.6 metres (91 ft), whereas longer ones, up to 33 metres (108 ft), have been recorded but not weighed.[11][12][13] It is estimated that this individual could have a mass of 250 tonnes or more.[14][15][16] The longest non-colonial animal is the lion's mane jellyfish (37 m, 120 ft).[17]

In 2023, paleontologists estimated that the extinct whale Perucetus, discovered in Peru, may have outweighed the blue whale, with a mass of 85 to 340 t (94–375 short tons; 84–335 long tons).[18] However, more recent studies suggest this whale was much smaller than previous estimates putting its weight at 60 to 113 tonnes.[19] While controversial, estimates for the weight of the sauropod Bruhathkayosaurus suggest it was around 110–170 tons, with the highest estimate being 240 tons, if scaled with Patagotitan, although actual fossil remains no longer exist, and that estimation is based on described dimensions in 1987.[20] In April 2024, Ichthyotitan severnensis was established as a valid shastasaurid taxon and is considered both the largest marine reptile ever discovered and the largest macropredator ever discovered. The Lilstock specimen was estimated to be around 26 metres (85 ft) whilst the Aust specimen was an even more impressive 30 to 35 metres (98 to 115 ft) in length. Whilst no weight estimates was made as of yet, Ichthyotitan would have easily rivalled or surpassed the blue whale.[21][22] The upper estimates of weight for these prehistoric animals would have easily rivaled or exceeded the largest rorquals and sauropods.[23]

The African bush elephant (Loxodonta africana) is the largest living land animal. A native of various open habitats in sub-Saharan Africa, males weigh about 6.0 tonnes (13,200 lb) on average.[24] The largest elephant ever recorded was shot in Angola in 1974. It was a male measuring 10.67 metres (35.0 ft) from trunk to tail and 4.17 metres (13.7 ft) lying on its side in a projected line from the highest point of the shoulder, to the base of the forefoot, indicating a standing shoulder height of 3.96 metres (13.0 ft). This male had a computed weight of 10.4 to 12.25 tonnes.[11]

Fungi

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Armillaria ostoyae
Main article: Largest fungal fruit bodies

The largest living fungus may be a honey fungus[25] of the species Armillaria ostoyae.[26] A mushroom of this type in the Malheur National Forest in the Blue Mountains of eastern Oregon, U.S. was found to be the largest fungal colony in the world, spanning 8.9 km2 (2,200 acres) of area.[27][28] This organism is estimated to be 2,400 years old. The fungus was written about in the April 2003 issue of the Canadian Journal of Forest Research. If this colony is considered a single organism, then it is the largest known organism in the world by area, and rivals the aspen grove "Pando" as the known organism with the highest living biomass. It is not known, however, whether it is a single organism with all parts of the mycelium connected.[28] Approximations of the land area of the Oregon "humongous fungus" are 3.5 square miles (9.1 km2) (2,240 acres (910 ha), possibly weighing as much as 35,000 tons as the world's most massive living organism.[29]

A spatial genetic analysis estimated that a specimen of Armillaria ostoyae growing over 91 acres (37 ha) in northern Michigan, United States weighs 440 tons (4 x 105 kg).[30][31]

In Armillaria ostoyae, each individual mushroom (the fruiting body, similar to a flower on a plant) has only a 5 cm (2.0 in) stipe, and a pileus up to 12.5 cm (4.9 in) across. There are many other fungi which produce a larger individual size mushroom. The largest known fruiting body of a fungus is a specimen of Phellinus ellipsoideus (formerly Fomitiporia ellipsoidea) found on Hainan Island.[32] The fruiting body masses up to 500 kg (1,100 lb).[33][34]

Until P. ellipsoideus replaced it, the largest individual fruit body came from Rigidoporus ulmarius. R. ulmarius can grow up to 284 kg (626 lb), 1.66 m (5.4 ft) tall, 1.46 m (4.8 ft) across, and has a circumference of up to 4.9 m (16 ft).

Lichen

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Umbilicaria mammulata is among the largest lichens in the world. The thallus of U. mammulata is usually 4 to 15 cm (1.6 to 5.9 in) in diameter, but specimens have been known to reach 63-centimetre (2.07 ft) in the Smoky Mountains of Tennessee.[35]

The longest lichen is Usnea longissima, which may grow to exceed 20 feet (6.1 m) in length.[36]

Protists

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Macrocystis pyrifera, the largest species of giant kelp

(Note: the group Protista is not used in current taxonomy.)

Amoebozoans (Amoebozoa)

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Among the organisms that are not multicellular, the largest are the slime molds, such as Physarum polycephalum, some of which can reach a diameter over 30 cm (12 in).[37] These organisms are unicellular, but they are multinucleate.

Euglenozoans (Euglenozoa)

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Some euglenophytes, such as certain species of Euglena, reach lengths of 400 μm.[38]

Rhizarians (Rhizaria)

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The largest species traditionally considered protozoa are giant amoeboids like foraminiferans. One such species, the xenophyophore Syringammina fragilissima, can attain a size of 20 cm (7.9 in).[39]

Alveolates (Alveolata)

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The largest ciliates, such as Spirostomum, can attain a length over 4 mm (0.16 in).[40]

Stramenopiles (Stramenopila)

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The largest stramenopiles are giant kelp from the northwestern Pacific. The floating stem of Macrocystis pyrifera can grow to a height of over 45 m (148 ft).[41][42]
Macrocystis also qualifies as the largest brown alga, the largest chromist, and the largest protist generally.

Bacteria

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The largest known species of bacterium is named Thiomargarita magnifica, which grows to 1 cm (0.39 in) in length,[43] making it visible to the naked eye and also about five thousand times the size of more typical bacteria.[44] BBC News described it as possessing the "size and shape of a human eyelash."[45] Science published a new paper on the bacterium on June 23, 2022.[46] According to a study coauthored by Jean-Marie Volland, a marine biologist and scientist at California's Laboratory for Research in Complex Systems, and an affiliate at the US Department of Energy Joint Genome Institute, T. magnifica can grow up to 2 centimeters long.[47]

  • Cyanobacteria
One of the largest "blue green algae" is Lyngbya, whose filamentous cells can be 50 μm wide.[48]

Viruses

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A collection of viruses, including M. horridgei - the largest virus

The largest virus on record is Megaklothovirus horridgei, with the length of 4 micrometres, comparable to the typical size of a bacterium and large enough to be seen in light microscopes. It was discovered in 2018 (being mistaken for bristles beforehand), having been found on an arrow worm in the genus Spadella.[49] Prior to this discovery, the largest virus was the peculiar virus genus Pandoravirus, which have a size of approximately 1 micrometer and whose genome contains 1,900,000 to 2,500,000 base pairs of DNA.[50]

Pandoravirus infects amoebas specifically, however Megaklothovirus infects Spadella arrow worms.

See also

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References

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Notes

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  1. ^ The organism sizes listed are frequently considered "outsized" and are not in the normal size range for the respective group.

Citations

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  1. ^ Mihai, Andrei (9 February 2015). "The Heaviest Living Organism in the World". ZME Science. Retrieved 10 February 2016.
  2. ^ "The Giant Sequoia National Monument". Sequoia National Forest. United States Department of Agriculture - Forest service. Retrieved 10 February 2016.
  3. ^ "Portuguese scientists discover world's oldest living organism". www.theportugalnews.com.
  4. ^ "Ibiza's Monster Marine Plant". Ibiza Spotlight. 28 May 2006. Archived from the original on 27 August 2006. Retrieved 2007-05-09.
  5. ^ Pearlman, Jonathan (7 February 2012). "'Oldest living thing on earth' discovered". The Telegraph. Archived from the original on 7 February 2012. Retrieved 11 February 2012.
  6. ^ Arnaud-Haond, Sophie; Duarte, Carlos M.; Diaz-Almela, Elena; Marbà, Núria; Sintes, Tomas; Serrão, Ester A.; Bruun, Hans Henrik (2012). "Implications of Extreme Life Span in Clonal Organisms: Millenary Clones in Meadows of the Threatened Seagrass Posidonia oceanica". PLOS ONE. 7 (2): e30454. Bibcode:2012PLoSO...730454A. doi:10.1371/journal.pone.0030454. PMC 3270012. PMID 22312426.
  7. ^ Zimmer, Carl (29 February 2024). "Researchers Dispute Claim That Ancient Whale Was Heaviest Animal Ever - A new study argues that Perucetus, an ancient whale species, was certainly big, but not as big as today's blue whales". The New York Times. Archived from the original on 29 February 2024. Retrieved 3 March 2024.
  8. ^ "Scientists discover 'biggest plant on Earth' off Western Australian coast". TheGuardian.com. 31 May 2022.
  9. ^ Edgeloe, Jane M.; Severn-Ellis, Anita A.; Bayer, Philipp E.; Mehravi, Shaghayegh; Breed, Martin F.; Krauss, Siegfried L.; Batley, Jacqueline; Kendrick, Gary A.; Sinclair, Elizabeth A. (2022-06-08). "Extensive polyploid clonality was a successful strategy for seagrass to expand into a newly submerged environment". Proceedings of the Royal Society B: Biological Sciences. 289 (1976): 20220538. doi:10.1098/rspb.2022.0538. PMC 9156900. PMID 35642363. S2CID 249204370.
  10. ^ Ibiza's Monster Marine Plant Archived 2007-12-26 at the Wayback Machine. Ibiza Spotlight (2006-05-28).
  11. ^ a b Wood, Gerald The Guinness Book of Animal Facts and Feats (1983) ISBN 978-0-85112-235-9
  12. ^ Davies, Ella (20 April 2016). "The longest animal alive may be one you never thought of". BBC Earth. Retrieved 14 February 2018.
  13. ^ "Largest mammal". Guinness World Records.
  14. ^ Motani, Ryosuke; Pyenson, Nicholas D. (29 February 2024). "Downsizing a heavyweight: factors and methods that revise weight estimates of the giant fossil whale Perucetus colossus". PeerJ. 12: e16978. doi:10.7717/peerj.16978. ISSN 2167-8359. PMC 10909350. PMID 38436015.
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  16. ^ "How big are blue whales? And what does 'big' mean? By palaeozoologist on DeviantArt". February 2014.
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  18. ^ Bianucci, Giovanni; Lambert, Olivier; Urbina, Mario; Merella, Marco; Collareta, Alberto; Bennion, Rebecca; Salas-Gismondi, Roberto; Benites-Palomino, Aldo; Post, Klaas; de Muizon, Christian; Bosio, Giulia; Di Celma, Claudio; Malinverno, Elisa; Paolo Pierantoni, Pietro; Maria Villa, Igor; Amson, Eli (2 August 2023). "A heavyweight early whale pushes the boundaries of vertebrate morphology". Nature. 620 (7975): 824–829. Bibcode:2023Natur.620..824B. doi:10.1038/s41586-023-06381-1. PMID 37532931. S2CID 260433513. Retrieved 2 August 2023.
  19. ^ Pester, Patrick (8 March 2024). "Colossus the enormous 'oddball' whale is not the biggest animal to ever live, scientists say". Lve Science. Retrieved 11 March 2024.
  20. ^ Paul, Gregory S.; Larramendi, Asier (11 April 2023). "Body mass estimate of Bruhathkayosaurus and other fragmentary sauropod remains suggest the largest land animals were about as big as the greatest whales". Lethaia. 56 (2): 1–11. Bibcode:2023Letha..56..2.5P. doi:10.18261/let.56.2.5. ISSN 0024-1164. S2CID 259782734.
  21. ^ News Staff (11 April 2018). "Giant Triassic Ichthyosaur is One of Biggest Animals Ever | Paleontology | Sci-News.com". SciNews. Archived from the original on 20 April 2024. Retrieved 20 April 2024.
  22. ^ Marshall, Michael (29 December 2022). "Largest ever animal may have been Triassic ichthyosaur super-predator". NewsScientist. Archived from the original on 18 April 2024. Retrieved 22 April 2024.
  23. ^ "Why the Blue Whale Might Not Be the Largest Animal in History". World Atlas. January 2024.
  24. ^ Emanuelson, Karen (2006). "Neonatal Care and Hand Rearing". Biology, Medicine, and Surgery of Elephants. pp. 223–241. doi:10.1002/9780470344484.ch16. ISBN 978-0-470-34448-4.
  25. ^ "Armillaria gallica, the humongous fungus humungus. Tom Volk's Fungus of the Month for April 2002". botit.botany.wisc.edu. Retrieved 2022-12-26.
  26. ^ "BBC News | SCI/TECH | Fantastic fungus find". news.bbc.co.uk. Retrieved 2022-12-26.
  27. ^ "Armillaria gallica, the humongous fungus humungus. Tom Volk's Fungus of the Month for April 2002". botit.botany.wisc.edu. Retrieved 2022-12-26.
  28. ^ a b "Environment & Nature News - Humungous fungus: world's largest organism? - 10/04/2003". www.abc.net.au. Retrieved 2022-12-26.
  29. ^ Vince Patton (12 February 2015). "Oregon Humongous Fungus Sets Record As Largest Single Living Organism On Earth (7 minute documentary video)". Oregon Field Guide. Retrieved 23 September 2019.
  30. ^ Anderson, A.; Sand, C.; Petchey, F.; Worthy, T. H. (2010). "Faunal extinction and human habitation in New Caledonia: Initial results and implications of new research at the Pindai Caves". Journal of Pacific Archaeology. 1 (1): 89–109. hdl:10289/5404.
  31. ^ Jason Daley (15 October 2018). "This humongous fungus is as massive as three blue whales: A new estimate suggests this mushroom is 2,500 years old and weighs 440 tons". Smithsonian.com. Retrieved 23 September 2019.
  32. ^ Walker, Matt. (2011-08-01) Giant fungus discovered in China. Bbc.co.uk
  33. ^ Dai, Y. C.; Cui, B. K. (2011). "Fomitiporia ellipsoidea has the largest fruiting body among the fungi". Fungal Biology. 115 (9): 813–814. doi:10.1016/j.funbio.2011.06.008. PMID 21872178.
  34. ^ Cui, Bao-Kai; Decock, Cony (2013). "Phellinus castanopsidis sp. nov (Hymenochaetaceae) from southern China, with preliminary phylogeny based on rDNA sequences". Mycological Progress. 12 (2): 341–351. Bibcode:2013MycPr..12..341C. doi:10.1007/s11557-012-0839-5. S2CID 17570036.
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  37. ^ Slime Mold Photos Archived 2015-06-30 at the Wayback Machine. Waynesword.palomar.edu
  38. ^ "Protist Images: Euglena gigas". Protist Information Server. 2004.
  39. ^ "The 27 Best Deep-Sea Species: #22 Xenophyophores | Deep Sea News". www.deepseanews.com. 2008-10-10. Retrieved 2022-12-26.
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  44. ^ Pennisi, Elizabeth. "Largest bacterium ever discovered has unexpectedly complex cells". Science. science.org. Retrieved 2022-02-24.
  45. ^ "Record bacterium discovered as long as human eyelash". BBC News. 2022-06-23. Retrieved 2022-06-24.
  46. ^ Volland, Jean-Marie; Gonzalez-Rizzo, Silvina; Gros, Olivier; Tyml, Tomáš; Ivanova, Natalia; Schulz, Frederik; Goudeau, Danielle; Elisabeth, Nathalie H.; Nath, Nandita; Udwary, Daniel; Malmstrom, Rex R. (2022-06-24). "A centimeter-long bacterium with DNA contained in metabolically active, membrane-bound organelles". Science. 376 (6600): 1453–1458. Bibcode:2022Sci...376.1453V. doi:10.1126/science.abb3634. ISSN 0036-8075. PMID 35737788. S2CID 249990020.
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  48. ^ Stal, Lucas J. (2007). "Diversity and Versatility, Clues to Life in Extreme Environments". In Seckbach, J. (ed.). Algae and Cyanobacteria in Extreme Environments. Cellular Origin, Life in Extreme Habitats and Astrobiology. Vol. 11, Part 7. Dordrecht, The Netherlands: Springer. pp. 659–680 (666). doi:10.1007/978-1-4020-6112-7_36. ISBN 978-1-4020-6111-0.
  49. ^ Barthélémy, Roxane-Marie (8 January 2019). "Serendipitous Discovery in a Marine Invertebrate (Phylum Chaetognatha) of the Longest Giant Viruses Reported till Date". Biology.
  50. ^ Brumfiel, Geoff (18 July 2013). "World's Biggest Virus May Have Ancient Roots". National Public Radio. Retrieved 18 July 2013.
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