Armadillidiidae

Armadillidiidae
Armadillidium vulgare
Armadillidium vulgare in its defensive posture
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Crustacea
Class: Malacostraca
Order: Isopoda
Suborder: Oniscidea
Family: Armadillidiidae
Brandt, 1833
Genera

See text

Armadillidiidae is a family of woodlice, a terrestrial crustacean group in the order Isopoda. Unlike members of other woodlouse families, members of this family can roll into a ball, an ability they share with the outwardly similar but unrelated pill millipedes and other animals. It is this ability which gives woodlice in this family their common name of pill bugs, roly polies or potato bugs. The best known species in the family is Armadillidium vulgare, the common pill bug.

Contents

Ecology and behaviour

Woodlice in the family Armadillidiidae are able to form their bodies into a ball shape, in a process known as conglobation. This behaviour is shared with pill millipedes (which are often confused with pill bugs[1]), armadillos and cuckoo wasps.[2] This behaviour may be triggered by stimuli such as vibrations or pressure, and is a key defence against predation; it also serves to reduce water loss through respiration.[3]

Relationships with people

Among adults, they are often seen as unwanted (but essentially harmless) home pests.[4] Keeping a pet pill bug requires a very moist habitat with limited light.[5] They can live up to about three years.[4]

Owners of pet tarantulas sometimes keep pill bugs as cage cleaners in the same habitat. The pill bugs eat faeces, mould, and leftovers.[5] They are sometimes caught and fed to pets such as lizards, but this is not recommended since those animals might become poisoned.[6]

Classification

The family Armadillidiidae is differentiated from other woodlouse families by the two-segmented nature of the antennal flagellum, by the form of the uropods, and by the ability to roll into a ball.[7]

Within the family Armadillididae, fourteen genera are currently recognised:[8]

  • Alloschizidium
  • Armadillidium
  • Ballodillium
  • Cristarmadillidium
  • Cyphodillidium
  • Echinarmadillidium
  • Eleoniscus
  • Eluma
  • Paxodillidium
  • Platanosphaera
  • Schizidium
  • Trichodillidium
  • Troglarmadillidium
  • Typhlarmadillidium

References

  1. ^ "Pill millipede (Glomeris marginata)". ARKive. http://www.arkive.org/species/ARK/invertebrates_terrestrial_and_freshwater/Glomeris_marginata/more_info.html. Retrieved June 21, 2007. 
  2. ^ Edward M. Barrows (2001). Animal behavior desk reference: a dictionary of animal behavior, ecology, and evolution (2nd ed.). CRC Press. p. 142. ISBN 9780849320057. 
  3. ^ Jacob T. Smigel & Allen G. Gibbs (2008). "Conglobation in the pill bug, Armadillidium vulgare, as a water conservation mechanism" (PDF). Journal of Insect Science 8 (44): 1–9. doi:10.1673/031.008.4401. PMID 20233103. http://www.bioone.org/doi/pdf/10.1673/031.008.4401. 
  4. ^ a b Sheryl Smith-Rogers (October 2009). "Wild Thing: Roly-Poly Pillbugs". TPW Magazine. http://www.tpwmagazine.com/archive/2009/oct/scout3/. Retrieved July 10, 2010. 
  5. ^ a b Stanley A. Schultz; Marguerite J. Schultz (2009). The Tarantula Keeper's Guide: Comprehensive Information on Care, Housing, and Feeding. Barron's Educational Series. pp. 181–183. ISBN 9780764138850. 
  6. ^ Eve Adamson (2005). Adopting a Pet For Dummies. For Dummies. p. 325. ISBN 9780764598791. 
  7. ^ P. J. Hayward & John Stanley Ryland (1995). "Crustaceans". Handbook of the marine fauna of north-west Europe. Oxford University Press. pp. 289–461. ISBN 9780198540557. 
  8. ^ Helmut Schmalfuss (2003). "World catalog of terrestrial isopods (Isopoda: Oniscidea) — revised and updated version". Stuttgarter Beiträge zur Naturkunde, Serie A 654: 341 pp. http://www.oniscidea-catalog.naturkundemuseum-bw.de/Cat_terr_isop.pdf. 

External links