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Woodlice Temporal range: ca.Carboniferous–present,
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Malacostraca
Order:	Isopoda
Suborder:	Oniscidea Latreille 1802
Sections
Diplocheta Tylida Microcheta Synocheta Crinocheta

A woodlouse (plural woodlice) is a crustacean from the monophyletic suborder Oniscidea within the isopods. The first woodlice were marine isopods which are presumed to have colonised land in the Carboniferous. They have many common names and although often referred to as 'terrestrial Isopods' some species live semiterrestrialy or have recolonised aquatic environments. Woodlice in the families Armadillidae, Armadillidiidae, Eubelidae, Tylidae and some other genera can roll up into an almost perfect sphere as a defensive mechanism, others have partial rolling ability but most cannot roll at all.

Woodlice have a basic morphology of a segmented, dorso-ventrally flattened body with 7 pairs of jointed legs, specialised appendages for respiration and like other peracarids, females 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.

While the broader phylogeny of the Oniscideans has not been settled, five Infraorders/Sections are agreed on with 3637 species validated in scientific literature in 2004 and 3710 species in 2014 out of an estimated total of 5000-7000 species extant worldwide. Key adaptations to terrestrial life has led to a highly diverse set of animals; from the marine littoral zone and subterranean lakes to arid deserts and mountain slopes 4,725m 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.

Anatomy

See also: Anatomical terms of location and Category:Arthropod anatomy

The exoskeletons of woodlice are permeable as they lack the waxy coating found on other terrestrial arthropods, such as the insects. Marine isopods

Tagmata

The bodies of woodlice are divided into three sections or tagma: Cephalon, Pereon and Pleon. The segments of the pereon and pleon are collectively called somites (body segments). Their dorsal plates are called tergites and their ventral plates are called sternites.

The appendages of woodlice may be biramous (branched) or uniramous (unbranched). The ramus (branch) which is furthest away from the woodlouse's central line of symmetry is termed the exopodite (external branch), while the ramus (branch) which closest to the woodlouse's centre is termed the endopodite (internal branch). Any part of the biramous appendage to which the exopodite and endopodite are attached to is termed the propodite.

Cephalon

The cephalon, or head, is the anterior-most part of the body. It is derived from the five cephalic and first thoracic metameres of the ancestral Eumalacostraca.

When referring to Onicideans in the context of other crustaceans the term cephalothorax is used, as what would have been the first thoracic segment in other Isopods has fused to the head in woodlice.

It has the following pairs of appendages:

• antennules (primary antennae) these are greatly reduced in all woodlice. They are tipped with aesthetascs and are used for olfaction. Their reduction in size is thought to make the harder to damage, in an encounter with a predator for example, thus acting as a reliable means of detecting moisture.
• antennae (secondary antennae) these consist of peduncle formed of five articles and end in a flagellum. The length and shape of the antennae are useful in identification as the flagellum, especially, varies considerably even between closely related species. These appendages a woodlouse's primary sensory organs, able to discern tactile and sensory cues. It has been shown that woodlice adapted to more terrestrial habitats have shorter and simpler flagella. The antennae of the supralittoral Ligia oceanica for example are two-thirds its body length while those of the fully terrestrial Helleria brevicornis are short and stubby. Some woodlice, like P scaber use their antennae to right themselves if they are turned upside down.
• mandibles
• maxillules
• maxillae
• maxillipeds, are derived from 'leg' appendages of the erstwhile first thoracic metamere.

Woodlice also have either a pair of compound eyes, with a varied number of ommatidae and in various arrangements, or a set of ocelli arranged symmetrically on both sides of the cephalon. Some woodlice, like the Platyarthus species which live as commensals in ant nests and some troglobitic species have lost sight altogether.

Pereon

The pereon (thorax) consists of seven pereonites (pereonal somites), each of which has a pair of uniramous (pereonal appendages). The pereopods are the woodlous's walking legs and consist of seven articles -

Manca are born with only six pairs of pereopods, the seventh pair only form after the first moult. In male, paired ventral copulatory papillae (occasionally a single cone) on ventral surface (sternite) of last (seventh) pereon segment (pereonite); transfers sperm to gonopods.
gonopore: In female reproductive system, opening of each oviduct to exterior; located on ventral surface (sternite) of fifth pereon segment (pereonite). epimera

Pleon

The pleon (abdomen) consists of five pleonites (pleonal somites). The posterior-most segment is called the telson. Morphologically this segment was formed by the fusion of the erstwhile sixth pleonal somite with the telson, thus it is referred to as the pleotelson in context of other crustaceans.

Each pleonite has a pair of pleopods (pleonal appendages), which are biramous and flattened parallel to the ventral surface of the pleon... psuedotrachea, respiration.

The telson also has a pair of appendages called the uropods. The size and shape of the uropods is varied but they are generally biramous, with distinct protopodite, exopodite and endopodite.

psuedotrachea

haemolymph

Male glands, hepatopancreas

tricorn, aesthetascs,

Book: S. Sutton (Auth.)- Woodlice - Pergamon Press (1972)

https://commons.wikimedia.org/wiki/File:FMIB_47699_Sturcture_of_the_Breathing_Organs_of_Porcellio_scaber.jpeg

https://commons.wikimedia.org/wiki/Category:The_British_Woodlice_(1906)

http://lanwebs.lander.edu/faculty/rsfox/invertebrates/armadillidium.html

http://lanwebs.lander.edu/faculty/rsfox/invertebrates/ligia.html

http://lanwebs.lander.edu/faculty/rsfox/invertebrates/armadillidium.html

https://research.nhm.org/glossary/all.html

http://www.gutenberg.org/files/43928/43928-h/43928-h.htm

https://archive.org/stream/britishwoodliceb00webb

https://archive.org/stream/bulletinunitedst541905unit

https://www.flickr.com/photos/internetarchivebookimages/14758874206/

https://www.flickr.com/photos/odonataman/10057865136

https://commons.wikimedia.org/wiki/File:Armadillo_officinalis_-_-_Print_-_Iconographia_Zoologica_-_Special_Collections_University_of_Amsterdam_-_UBAINV0274_006_03_0042.tif

http://nzslaters.massey.ac.nz/morphology.php

http://www.sylvanusservices.com/resources/Woodlice_Info.pdf

https://commons.wikimedia.org/wiki/File:Porcellio_olivieri_-_-_Print_-_Iconographia_Zoologica_-_Special_Collections_University_of_Amsterdam_-_UBAINV0274_098_08_0032.tif

Lifecycle

• Lifecycle: eggs in marsupium, mancae, juveniles, parturial moults, mating (mate guarding), inter moult, number of broods, number of young etc https://www.researchgate.net/publication/232251705_Male_Mating_Success_During_Parturial_Intermoults_in_the_Terrestrial_Isopod_Armadillidium_Vulgare_Revealed_by_the_Use_of_a_Microsatellite_Locus

wolbachia sex change

DOI 10.1163/187498308X414724

Ecology

soil formation, nutrient recycling

Diversity

• Woodlouse species diversity: mainly terrestrial in damp habitats but supralittoral species: ligia (sea slaters/rock lice) & tylos (https://www.sciencedirect.com/science/article/pii/S0065288108600620?via%3Dihub), freshwater: macedonthens stankoi, saltwater:Haloniscus searlei https://www.sciencedirect.com/science/article/pii/0010406X69900322, high altitude: Protracheoniscus nivalis, up to 4725m in Ladakh (https://www.biodiversitylibrary.org/part/201022), arid H.reamuri, cave ... , commensalists in ant nests Plathyarthrus spp., mainly detritivores but carnivore tylos latreillei, size smallest?, largest upto 55 mm Tylos granulatus

Cave species:...

Mediterranean coastal regions more diversity due to high proportion of the two groups Ligidium and the Synocheta, which are restricted to wet environments in the temperate, deciduous forest belt of the Holarctic region.

Hemilepistus reaumuri, well known because of its highly developed social behavior. It occurs along the northern edge of the Sahara from Algeria to southern Israel, western Jordan, and the Syrian Desert. However, if we look for its closest relatives, we find them in western and central Asia. This means that Hemilepistus reaumuri came from the east and that the colonization of North Africa was a secondary event after the species had colonized the central Near East.

Helmut Schmalfuss (1998) THE TERRESTRIAL ISOPOD FAUNA OF THE CENTRAL NEAR EAST: COMPOSITION AND BIOGEOGRAPHY, Israel Journal of Zoology, 44:3-4, 263-271

Shachak, M. & Yair, Y. (1984) Population dynamics and the role of Hemilepistus reaumurii (Audouin & Savigny) in a desert ecosystem. Symposia of the Zoological Society of London, 53, 295–314

P. albinus reaching far into real desert, i.e., Saharan sand seas; linsenmair 2007

Feeding

• https://doi.org/10.1017/S1464793102005912 https://doi.org/10.3897/zookeys.577.6149
• olfaction
• Most species are detritivores, feeding on rotting plant matter some supralittoral species are general scavengers ...(ligia oppurtunic feeders?) Carnivorous behavior has been observed in Tylos latereilly, which actively searches sandy beaches at night for dead fish but also attacks live amphipods.
• Endogenous microbes vs exogenous https://academic.oup.com/femsec/article/61/1/141/520644
• Coprophagy
• heavy metal remediation http://www.csub.edu/~ddodenhoff/Bio100/literature/paper6.pdf

Predation

• Rhinophoridae: woodlouse flies - larva parasitise... https://www.cambridge.org/core/journals/parasitology/article/tachinid-parasites-of-woodlice/C27316E7A271EBF6681103BA98B9BF72 , https://www.researchgate.net/publication/270566512_4320_Rhinophoridae
• iridavirus https://www.flickr.com/photos/treegrow/35851713890 https://link.springer.com/chapter/10.1007/978-3-642-70280-8_4

Other Behaviour

• Like other crustaceans these animals regularly groom themselves; antennae are cleaned by scraping against a specialised groove in the first pereopod and the pereopods are cleaned by either rubbing against each other or using mouthparts. https://www.academia.edu/8210500/Grooming_structure_and_function_in_some_terrestrial_Crustacea
  
• Aggregation,
• Personality: Porcellio scaber https://zookeys.pensoft.net/articles.php?id=5778 a. vulgare
• Kinesis

conglobation

the following families are rollers: Armadillidae, Eubelidae, Armadillidiidae, Sphaeroniscidae, and Tylidae (hornburg review)

Origins and taxonomy

• taxonomy: erhard https://www.tandfonline.com/doi/abs/10.1080/00212210.1998.10688953

According to Schmallfuss(http://www.oniscidea-catalog.naturkundemuseum-bw.de/Cat_terr_isop.pdf) these five taxa below are widely recognised but their phylogeny is still debated, so I think it's best to avoid phylogenetic trees or mentions of other uncertain taxa like Holoverticata, Tylomorpha, Orthogonopoda, Ligiamorpha etc.

Diplocheta (1 family - Ligiidae)
Tylida (1 family - Tylidae)
Microcheta (1 family - Mesoniscidae)
Synocheta (5 families - Schoebliidae, Styloniscidae, Titanidae, Trichoniscidae, Tunanoniscidae)
Crinocheta (26 families- Agnaridae, Alloniscidae, Armadillidae, Armadillidiidae, Balloniscidae, Bathytropidae, Berytoniscidae, Bisilvestriidae, Cylisticidae, Delatorreidae, Detonidae, Dubioniscidae, Eubelidae, Halophilosciidae, Hekelidae, IIrmaosidae, Olibrinidae, Oniscidae, Philosciidae, Platyarthridae, Porcellionidae, Pudeoniscidae, Pudeoniscidae, Rhyscotidae, Scleropactidae, Scyphacidae, Spelaeoniscidae, Sphaeroniscidae, Stenoniscidae, Tendosphaeridae, Trachelipodidae) He lists 31 families though

The earliest woodlice fossils date to the cretaceaous but common ancestor in Carboniferous... woddlice don't fossilise well

common names/cultural/ human interactions

Woodlice neither eat live wood/dead wood(but eat rotting wood) nor are parasitic...

• Common names

Common names for woodlice vary throughout the English-speaking world. A number of local names make reference to conglobation, others make comparisons to a pig, others relate to coastal habitat of family ligiidae. Ligiidae names: rock lice, sea slaters, wharf roaches, sea roaches, rock slaters, quay louse

Local names for common cosmopolitian species include: From existing article

• As medicine:

Early mentions of hoglice(confused distintction between pill millipedes and pill woodlice) as medicine

Latreille's mention of woodlice as medicine: Vol 1 p 361 On ordonne souvent la poudre de cloporte dans l'asthme, dans l'esquinancie(angina), l'hydropisie, dans les maladies où il faut fondre et résoudre les humeurs, purifier le sang, etc.

• taxonomy:

First taxonomic reference: linnaeus oniscus https://www.biodiversitylibrary.org/item/10277#page/658/mode/1up

First use of oniscidea: Latreille Histoire naturelle, générale et particulière des crustacés et des insectes Vol 3 p 42 oniscides

Key taxonomic milestone: Budde-lunds first oniscidea catalog

-=-=-=-=-=-=-=-=-=-=-

• ? Article title should be changed to Oniscidea/Woodlouse should redirect to Oniscidea.?
• Pillbug currently redirects to Armadillidiidae. Pillbugs should go to disambiguation like roly poly or doodle bug as pill millipedes are also called pillbugs
• ?Pill millipedes and pill woodice section to merge into ...
• List of woodlice of the british isles to go to see also
• List of wood lice of france can be created from vandel 1960
• List of wood lice of US and Canada https://decapoda.nhm.org/pdfs/4571/4571.pdf

http://www.naturkundemuseum-bw.de/publikationen/stuttgarter-beitraege-zur-naturkunde-serie-a

http://www.bmig.org.uk/sites/www.bmig.org.uk/files/bulletin/BullBMIG27%282014%29p03-26_Gregory-Eden.pdf

Warburg, M. R. (1968). Behavioural adaptations of terrestrial isopods. Am. Zool. 8: 545-559. http://www.zmuc.dk/commonweb/JOURNALS/PDF/Vol28-1/Schmidt&Leistikow.pdf

https://zookeys.pensoft.net

https://www.bsb-muenchen.de/

http://www.bnf.fr/fr/acc/x.accueil.html

https://www.biodiversitylibrary.org

Sci-hub | Libgen

Roller: Tylidae, Eubelidae, Armadillidae, Scleropactidae, cyslictus, armadillididae

http://tolweb.org/notes/?note_id=4179