Woodlouse

Woodlice
Temporal range: Early Cretaceous–present, 113–0 Ma
Collage of woodlice
Clockwise from top right: Ligia oceanica, Hemilepistus reaumuri, Platyarthrus hoffmannseggii and Schizidium tiberianum
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Malacostraca
Order: Isopoda
Suborder: Oniscidea
Latreille 1802[1]
Sections

Woodlice are terrestrial isopods in the suborder Oniscidea. Their name is derived from being often found in old wood,[2] and from louse, a parasitic insect,[3] although woodlice are neither parasitic nor insects.

Woodlice evolved from marine isopods which are presumed to have colonised land in the Carboniferous, though the oldest known fossils are from the Cretaceous period.[4] This makes them quite unique among the crustaceans, being one of the few lineages to have transitioned into a fully terrestrial environment.

Woodlice have many common names and although often referred to as terrestrial isopods, some species live semiterrestrially or have recolonised aquatic environments like those of the genus Ligia. Woodlice in the families Armadillidae, Armadillidiidae, Eubelidae, Tylidae and some other genera can roll up into a roughly spherical shape (conglobate) as a defensive mechanism or to conserve moisture; others have partial rolling ability, but most cannot conglobate at all.

Woodlice have a basic morphology of a segmented, dorso-ventrally flattened body with seven pairs of jointed legs, and specialised appendages for respiration. Like other peracarids, female woodlice carry fertilised eggs in their marsupium, through which they provide developing embryos with water, oxygen and nutrients. The immature young hatch as mancae and receive further maternal care in some species. Juveniles then go through a series of moults before reaching maturity. Mancae are born with 6 segments and gain an additional one after their first molt.

Whole woodlouse.

While the broader phylogeny of the Oniscideans has not been settled, eleven infraorders/sections are agreed on with 3,937 species validated in scientific literature in 2004[5] and 3,710 species in 2014 out of an estimated total of 5,000–7,000 species extant worldwide.[6] Key adaptations to terrestrial life have led to a highly diverse set of animals; from the marine littoral zone and subterranean lakes to arid deserts and desert slopes 4,725 m (15,500 ft) above sea-level, woodlice have established themselves in most terrestrial biomes and represent the full range of transitional forms and behaviours for living on land.

Woodlice are widely studied in the contexts of evolutionary biology, behavioural ecology and nutrient cycling. They are popular as terrarium pets because of their varied colour and texture forms, conglobating ability and ease of care.

Recent research has shown that the grouping as traditionally defined may not be monophyletic, with some taxa like Ligia and possibly Tylidae more closely related to other marine isopod groups, though the majority of woodlice probably do constitute a clade.[7][8]

Common names

[edit]

Common names for woodlice vary throughout the English-speaking world. A number of common names make reference to the fact that some species of woodlice can roll up into a ball. Other names compare the woodlouse to a pig. The collective noun is a quabble of woodlice.[9]

Common names include:

Description and life cycle

[edit]
Basic body regions of the woodlouse

The woodlouse has a shell-like exoskeleton, which it must progressively shed as it grows. The moult takes place in two stages;[35] the back half is lost first, followed two or three days later by the front. This method of moulting is different from that of most arthropods, which shed their cuticle in a single process. It is theorized that this allows woodlice to maintain partial mobility while molting.

A female woodlouse will keep fertilised eggs in a marsupium on the underside of her body, which covers the under surface of the thorax and is formed by overlapping plates attached to the bases of the first five pairs of legs. They hatch into offspring that look like small white woodlice curled up in balls, although initially without the last pair of legs.[35] The mother then appears to "give birth" to her offspring. A few species are also capable of reproducing asexually.[36]

Despite being crustaceans like lobsters or crabs, woodlice are said to have an unpleasant taste similar to "strong urine".[37] This is due to their high concentration of uric acid,[38] which is one of the chemicals in urine. Though other sources say that they taste like prawn, shrimp, or crawfish. [39]

Pillbugs and pill millipedes

[edit]
Comparison of the pill bug Armadillidium vulgare (left) and the pill millipede Glomeris marginata (right)

Pill bugs (woodlice of the family Armadillidiidae and Armadillidae) can be confused with pill millipedes of the order Glomerida.[40] Both of these groups of terrestrial segmented arthropods are about the same size. They live in very similar habitats, share a similar diet, and conglobate as a defense mechanism. Pill millipedes and pillbugs appear superficially similar to the naked eye. This is an example of convergent evolution.

These two groups can be distinguished in several ways. Glomeris millipedes have 19 (males) or 17 (females) pairs of legs, while pill bugs only have 7 pairs of legs. Additionally, pill bugs have a thorax consisting of 7 body segments, 5 abdominal segments, and a pleotelson, while Glomeris millipedes lack a visually defined thorax and have 12 body segments total. While the uropods of pillbugs are relatively quite small, flipping a pill bug over will reveal the small uropod overlapping the pleotelson.[41] Some woodlouse species, like Armadillidium maculatum, seem to display Batesian Mimicry to certain pill millipedes like Glomeris marginata.

Woodlice under a concrete block.

Ecology

[edit]
Environmental extremes
Hemilepistus reaumuri lives in "the driest habitat conquered by any species of crustacean".[42]
Ligia oceanica is aquatic.

Many members of Oniscidea live in terrestrial, non-aquatic environments, breathing through trachea-like lungs in their paddle-shaped hind legs (pleopods), called pleopodal lungs. Woodlice need moisture because they rapidly lose water by excretion and through their cuticle, and so are usually found in damp, dark places, such as under rocks and logs, although one species, the desert dwelling Hemilepistus reaumuri, inhabits "the driest habitat conquered by any species of crustacean".[42] They are usually nocturnal and are detritivores, feeding mostly on dead plant matter.

A few woodlice have returned to water. Evolutionary ancient species are amphibious, such as the marine-intertidal sea slater (Ligia oceanica), which belongs to family Ligiidae. Other examples include some Haloniscus species from Australia (family Scyphacidae), and in the northern hemisphere several species of Trichoniscidae and Thailandoniscus annae (family Styloniscidae). Species for which aquatic life is assumed include Typhlotricholigoides aquaticus (Mexico) and Cantabroniscus primitivus (Spain).[43]

Woodlice are the most common prey of the spider Dysdera crocata.

Woodlice are eaten by a wide range of insectivores, including spiders of the genus Dysdera, such as the woodlouse spider Dysdera crocata,[32] and land planarians of the genus Luteostriata, such as Luteostriata abundans.[44]

Woodlice are sensitive to agricultural pesticides, but can tolerate some toxic heavy metals, which they accumulate in the hepatopancreas. Thus they can be used as bioindicators of heavy metal pollution.[45]

Evolutionary history

[edit]

The oldest fossils of woodlice are known from the mid-Cretaceous around 100 million years ago, from amber deposits found in Spain, France and Myanmar, These include a specimen of living genus Ligia from the Charentese amber of France, the genus Myanmariscus from the Burmese amber of Myanmar, which belongs to the Synocheta and likely the Styloniscidae,[46] Eoligiiscus tarraconensis which belongs to the family Ligiidae, Autrigoniscus resinicola which belongs to the family Trichoniscidae, and Heraclitus helenae which possibly belongs to Detonidae all from Spanish amber,[47] and indeterminate specimens Charentese amber.[4][46] The widespread distribution and diversification apparent of woodlice in the mid-Cretaceous implies that the origin of woodlice predates the breakup of Pangaea, likely during the Carboniferous.[4]

As pests

[edit]

Although woodlice, like earthworms, are generally considered beneficial in gardens for their role in controlling certain pests,[48] producing compost and overturning the soil, some species like those of the genus Armadillidium have also been known to feed on cultivated plants, such as ripening strawberries and tender seedlings.[49]

Woodlice can also invade homes en masse in search of moisture and their presence can indicate dampness problems.[50] They are not generally regarded as a serious household pest as they do not spread disease and do not damage sound wood or structures. They can be easily removed with the help of vacuum cleaners, chemical sprays, insect repellents, and insect killers,[51] or by removing the dampness.

As pets

[edit]

Woodlice have become a popular household pet for children as well as a hobby for invertebrate and insect enthusiasts or collectors.[52] Porcellionidae (sowbugs) and Armadillididae (pillbugs) are seen often as they are the most common terrestrial isopods in Europe and North America.[53]

While some isopod species are kept purely as pets, some can also be used as an addition to bioactive terrariums, due to their ability to break down decaying organic materials.

Morphs and species in the hobby

[edit]

As isopods are bred in captivity, some hobbyists will discover a new mutation, or they will selectively breed isopods for a specific color/pattern expression. These populations with unique appearances are referred to as 'morphs'. Morphs are given nicknames, usually by the breeder who discovered/created the morph. The standard appearance of an isopod species is often referred to as 'Wild Type'.

Some isopod morphs are characterized by polygenic traits, such as 'Orange Vigor' (Armadillidium vulgare) and 'Pink Rubber Ducky' (Cubaris sp. "Rubber Ducky"), the result of selectively breeding isopods that best match the desired appearance. These genes can vary in their expression greatly, as they are not the result of a specific genetic mutation.[54]

Other morphs are the result of dominant or recessive mutations, as seen with 'T+/T− Albino' and 'Whiteout' (Several spp.). As an example, T+ albino isopods are the result of an isopod being born without the ability to produce melanin, removing all black pigmentation. However, they are believed to be tyrosinase-positive (hence the T+), and therefore can still create some darker pigments such as brown and purple. T− albino isopods are thought to lack both melanin and tyrosinase, and therefore only express light yellows, oranges, and white.[55][56][57]

Confusion can often arise due to the rate at which unidentified or undescribed isopod species are introduced to the hobby. This has contributed significantly to the genus Cubaris being considered a wastebasket taxon,[58] as many of the unidentified or undescribed isopod species are incorrectly labelled as "Cubaris sp." even when they do not fit the formal description of the genus.

In the British Isles

[edit]
This section is an excerpt from List of woodlice of the British Isles.[edit]
Woodlice are the most species-rich group of terrestrial crustaceans.[59] Of the 4,000 described species found worldwide,[60] 35 species in 10 families are native to the British Isles. One of these species, Acaeroplastes melanurus, had been considered extinct in the British Isles but was rediscovered in 2002 at its only site (Howth, County Dublin, Ireland), and a further ten species have become naturalised in greenhouses, presumably transported with exotic plants.[61] Five species are especially common throughout the British Isles, and are known as the "famous five species".[62] They are Oniscus asellus (the common shiny woodlouse), Porcellio scaber (the common rough woodlouse), Philoscia muscorum (the common striped woodlouse), Trichoniscus pusillus (the common pygmy woodlouse) and Armadillidium vulgare (the common pill bug). One species, Metatrichoniscoides celticus, is endemic to Glamorgan, and is listed as a vulnerable species in the IUCN Red List.

Classification

[edit]

There is general agreement that there are five main lineages in suborder Oniscidea, although the phylogenetic relationships between them are unsettled.[63][64][5][65][6] Two main schemes for the classification that differ in which group is considered sister to the remaining oniscideans. One places Ligiidae in section Diplocheta, with the remaining families divided between four sections in infraorder Holoverticata.[63][5] The other places Tylidae in infraorder Tylomorpha, with the remaining families placed in three sections in infraorder Ligiamorpha.[64] The former scheme is presented below.

See also

[edit]

Notes

[edit]

References

[edit]
  1. ^ WORMS
  2. ^ "woodlouse". Online Etymology Dictionary. Retrieved April 14, 2020.
  3. ^ "Woodloouse, n.". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
    "Louse, n.". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
  4. ^ a b c Broly, Pierre; Deville, Pascal; Maillet, Sébastien (December 23, 2012). "The origin of terrestrial isopods (Crustacea: Isopoda: Oniscidea)". Evolutionary Ecology. 27 (3): 461–476. doi:10.1007/s10682-012-9625-8. ISSN 0269-7653. S2CID 17595540.
  5. ^ a b c Helmut Schmalfuss (2003). "World catalog of terrestrial isopods (Isopoda: Oniscidea)—revised and updated version" (PDF). Stuttgarter Beiträge zur Naturkunde, Serie A. 654: 341 pp.
  6. ^ a b Sfendourakis, Spyros; Taiti, Stefano (July 30, 2015). "Patterns of taxonomic diversity among terrestrial isopods". ZooKeys (515): 13–25. Bibcode:2015ZooK..515...13S. doi:10.3897/zookeys.515.9332. ISSN 1313-2970. PMC 4525032. PMID 26261437.
  7. ^ Dimitriou, Andreas C.; Taiti, Stefano; Sfenthourakis, Spyros (December 6, 2019). "Genetic evidence against monophyly of Oniscidea implies a need to revise scenarios for the origin of terrestrial isopods". Scientific Reports. 9 (1). Nature: 18508. Bibcode:2019NatSR...918508D. doi:10.1038/s41598-019-55071-4. PMC 6898597. PMID 31811226.
  8. ^ Lins, Luana S. F.; Ho, Simon Y. W.; Lo, Nathan (October 15, 2017). "An evolutionary timescale for terrestrial isopods and a lack of molecular support for the monophyly of Oniscidea (Crustacea: Isopoda)". Organisms Diversity & Evolution. 17 (4). Springer: 813–820. Bibcode:2017ODivE..17..813L. doi:10.1007/s13127-017-0346-2. S2CID 6580830.
  9. ^ "Appendix:Glossary of collective nouns by collective term", Wiktionary, August 27, 2022, retrieved November 19, 2022
  10. ^ Dale Mayer (2010). The Complete Guide to Companion Planting: Everything You Need to Know to Make Your Garden Successful. Atlantic Publishing Company. p. 88. ISBN 9781601383457.
  11. ^ "Dictionary of Newfoundland English - boat n". Retrieved February 27, 2012.
  12. ^ "Bugs Bugs Bugs!" (PDF). Museum Victoria. Retrieved March 30, 2010.
  13. ^ "Australian Word Map". Macquarie Dictionary. Macmillan Publishers, Australia. 2014. Retrieved February 8, 2015.
  14. ^ "Dictionary of Newfoundland English - carpenter n". Dictionary of Newfoundland English. Retrieved September 29, 2016.
  15. ^ Paul Kerswill. "The sound of Reddin". BBC. Retrieved September 17, 2006.
  16. ^ James Chapple (January 14, 2016). "Everyone in Guildford is calling wood lice 'cheesy bobs' and it's brilliant". Trinity Mirror Group. Retrieved January 15, 2016.
  17. ^ Howe, Ian (2012). Kent Dialect. Bradwell Books. pp. 7, 18. ISBN 9781902674346.
  18. ^ "BBC Devon: Voices". BBC Devon. Retrieved June 25, 2012.
  19. ^ "365 Urban Species. #093: Woodlouse". The Urban Pantheist. April 3, 2006. Retrieved January 18, 2009.
  20. ^ Aylward, Steve (March 30, 2021). "The egg-cellent world of invertebrate eggs". Suffolk Wildlife Trust. Retrieved April 8, 2022.
  21. ^ Barber, A. D. (2015). "Vernacular names of woodlice with particular reference to Devonshire" (PDF). Bulletin of the British Myriapod & Isopod Group. 28: 54–63.
  22. ^ "Sow bug". Dictionary.com Unabridged (v 1.0.1). 2006. Retrieved August 17, 2006.
  23. ^ Matthew Francis (2004). Where the People Are: Language and Community in the Poetry of W.S. Graham. Salt Publishing. ISBN 978-1-876857-23-3.
  24. ^ Oxford English Dictionary 1933: headword Hog-louse
  25. ^ "Pillbugs". Niles Biological, Inc. Retrieved June 8, 2016.
  26. ^ Bill Amos (August 10, 2002). "Little armored tanks". Caledonian-Record.
  27. ^ a b Bert Vaux & Scott A. Golder. "Dialect Survey". Harvard University. Archived from the original on September 3, 2006. Retrieved September 30, 2006.
  28. ^ Gail Smith-Arrants (March 20, 2004). "You say potato bug, I say roly-poly, you say…" (PDF). Charlotte Observer.
  29. ^ Mairi Robinson, ed. (1987). The Concise Scots Dictionary (3rd ed.). Aberdeen: Aberdeen University Press. p. 628. ISBN 978-0-08-028492-7.
  30. ^ Maria Minor & A. W. Robertson (2006). "Guide to New Zealand soil invertebrates: Isopoda". Massey University. Retrieved May 13, 2007.
  31. ^ Josh Byrne (2009). "Fact Sheet: Slater Control". Australian Broadcasting Corporation. Retrieved May 22, 2012.
  32. ^ a b Bruce Marlin. "Common Woodlouse, Sow Bug, Pillbug". North American Insects and Spiders. Archived from the original on March 7, 2016. Retrieved February 10, 2009.
  33. ^ "Wood Bug". Vancouver Sun. November 26, 2007. Archived from the original on July 2, 2012.
  34. ^ "Woodlouse, slater, or chucky pig? This insect has more than 250 names!". BBC Newsround. July 8, 2020. Retrieved March 8, 2023.
  35. ^ a b Calman, William Thomas (1911). "Wood-louse" . In Chisholm, Hugh (ed.). Encyclopædia Britannica. Vol. 28 (11th ed.). Cambridge University Press. p. 802.
  36. ^ "How Now, Sow Bug?," Discover, August 1999, 68.
  37. ^ "How Now, Sow Bug?," Discover, August 1999, 68.
  38. ^ DRESEL, ELISABETH I. B.; MOYLE, VIVIEN (September 1, 1950). "Nitrogenous Excretion of Amphipods and Isopods". Journal of Experimental Biology. 27 (2): 210–225. doi:10.1242/jeb.27.2.210. ISSN 1477-9145. PMID 14794856.
  39. ^ "Deep Look | Roly Polies Came from the Sea to Conquer the Earth | Season 4 | Episode 2 | PBS". PBS. Retrieved August 12, 2024.
  40. ^ "Pill woodlouse (Armadillidium vulgare)". ARKive.org. Archived from the original on September 3, 2009. Retrieved February 13, 2009.
  41. ^ "Armadillidium vulgare, with notes on Porcellio, Ligia, and Oniscus". lanwebs.lander.edu. Retrieved September 23, 2023.
  42. ^ a b Rod Preston-Mafham & Ken Preston-Mafham (1993). "Crustacea. Woodlice, crabs". The Encyclopedia of Land Invertebrate Behavior. MIT Press. p. 161. ISBN 978-0-262-16137-4.
  43. ^ Ivo Karaman (2003). "Macedonethes stankoi n. sp., a rhithral oniscidean isopod (Isopoda: Oniscidea: Trichoniscidae) from Macedonia" (PDF). Organisms Diversity & Evolution. 3 (8): 1–15. doi:10.1078/1439-6092-00054.
  44. ^ Prasniski, M. E. T.; Leal-Zanchet, A. M. (2009). "Predatory behavior of the land flatworm Notogynaphallia abundans (Platyhelminthes: Tricladida)". Zoologia (Curitiba). 26 (4): 606. doi:10.1590/S1984-46702009005000011.
  45. ^ Paoletti, Maurizio G.; Hassall, Mark (1999). "Woodlice (Isopoda: Oniscidea): their potential for assessing sustainability and use as bioindicators". Agriculture, Ecosystems & Environment. 74 (1–3): 157–165. Bibcode:1999AgEE...74..157P. doi:10.1016/S0167-8809(99)00035-3.
  46. ^ a b Broly, Pierre; Maillet, Sébastien; Ross, Andrew J. (July 2015). "The first terrestrial isopod (Crustacea: Isopoda: Oniscidea) from Cretaceous Burmese amber of Myanmar". Cretaceous Research. 55: 220–228. Bibcode:2015CrRes..55..220B. doi:10.1016/j.cretres.2015.02.012.
  47. ^ Sánchez-García, Alba; Peñalver, Enrique; Delclòs, Xavier; Engel, Michael S. (August 6, 2021). "Terrestrial Isopods from Spanish Amber (Crustacea: Oniscidea): Insights into the Cretaceous Soil Biota". American Museum Novitates (3974): 1–32. doi:10.1206/3974.1. hdl:2445/182822. ISSN 0003-0082. S2CID 236936902.
  48. ^ Bailey, Pat (March 15, 1999). "Humble Roly-Poly Bug Thwarts Stink Bugs in Farms, Gardens". UC Davis News Service.
  49. ^ Phillip E. Sloderbeck (2004). "Pillbugs and sowbugs" (PDF). Kansas State University.
  50. ^ "Sow Bugs". Pestcontrolcanada.com. Retrieved August 17, 2012.
  51. ^ "How To Get Rid Of Woodlice in Home Naturally | With Best Woodlice Killer". June 3, 2020.
  52. ^ "American Isopod and Myriapod Group - Isopod Hobby". www.americanisopodsmyriapods.com. Retrieved September 23, 2023.
  53. ^ "Pillbugs and Sowbugs (Land Isopods)". Missouri Department of Conservation. Retrieved August 18, 2021.
  54. ^ "American Isopod and Myriapod Group - Color Morphs". www.americanisopodsmyriapods.com. Retrieved September 23, 2023.
  55. ^ Hasegawa, Y.; Negishi, S.; Naito, J.; Ishiguro, I.; Martin, G.; Juchault, E; Katakura, Y. (1997). "Genetic and Biochemical Studies on Ommochrome Genesis in an Albino Strain of a Terrestrial Isopod, Armadillidium vulgare". Pigment Cell Research. 10 (5): 265–270. doi:10.1111/j.1600-0749.1997.tb00686.x. ISSN 0893-5785. PMID 9359622.
  56. ^ Raper, Henry Stanley (January 1, 1926). "The Tyrosinase-Tyrosine Reaction". Biochemical Journal. 20 (4): 735–742. doi:10.1042/bj0200735. ISSN 0306-3283. PMC 1251777. PMID 16743714.
  57. ^ Alikhan, M.A. (1976). "The tyrosinase system in the terrestrial isopod, Porcellio laevis latreille (porcellionidae, isopoda)". Comparative Biochemistry and Physiology Part B: Comparative Biochemistry. 54 (1): 37–42. doi:10.1016/0305-0491(76)90053-5. PMID 5233.
  58. ^ Lillemets, Birgitta; Wilson, George D. F. (June 1, 2002). "Armadillidae (Crustacea: Isopoda) from Lord Howe Island: new taxa and biogeography". Records of the Australian Museum. 54 (1): 71–98. doi:10.3853/j.0067-1975.54.2002.1360. ISSN 0067-1975.
  59. ^ Richard Brusca (August 6, 1997). "Isopoda". Tree of Life Web Project.
  60. ^ Helmut Schmalfuss (2003). "World catalog of terrestrial isopods (Isopoda: Oniscidea) – revised and updated version" (PDF). Stuttgarter Beiträge zur Naturkunde, Serie A. 654: 341.
  61. ^ Paul T. Harding & Stephen L. Sutton (1985). Woodlice in Britain and Ireland: distribution and habitat (PDF). Abbots Ripton, Huntingdon, Institute of Terrestrial Ecology. p. 151. ISBN 0-904282-85-6. accessed through the NERC Open Access Research Archive (NORA)
  62. ^ "Walking with Woodlice". Imperial College London.
  63. ^ a b Erhard, Friedhelm (1998). "Phylogenetic relationships within the Oniscidea (Crustacea, Isopoda)". Israel Journal of Zoology. 44 (3–4): 303–309.
  64. ^ a b Martin, Joel W.; Davis, George E. (2001). An Updated Classification of the Recent Crustacea (PDF). County Contributions in Science. Vol. 39. Natural History Museum of Los Angeles. pp. 1–124.
  65. ^ Schmidt, C. (2008). "Phylogeny of the terrestrial Isopoda (Oniscidea): a review" (PDF). Arthropod Systematics & Phylogeny. 66: 191–226. doi:10.3897/asp.66.e31684.
[edit]

Further reading

[edit]
Retrieved from "https://en.wikipedia.org/w/index.php?title=Woodlouse&oldid=1253917014"