Armadillidiidae

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Armadillidiidae
Armadillidium vulgare 001.jpg
Slater rolled up for wiki.jpg
Armadillidium vulgare walking (above) and in defensive posture (below)
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Crustacea
Class: Malacostraca
Order: Isopoda
Suborder: Oniscidea
Family: Armadillidiidae
Brandt, 1833

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 names of pill bugs,[1] roly polies, or doodle bugs.[2] The best known species in the family is Armadillidium vulgare, the common pill bug.

Ecology and behaviour[edit]

Roly poly bugs 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[3]), armadillos and cuckoo wasps.[4] It may be triggered by stimuli such as vibrations or pressure, and is a key defense against predation; it may also reduce respiratory water losses.[5]

Classification[edit]

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, or conglobate.[6]

Within the family Armadillidiidae, fifteen genera are currently recognized:[7]

References[edit]

  1. ^ Gordon Gordh & David H. Headrick (2011). "Common pillbug". A Dictionary of Entomology (2nd ed.). CAB International. p. 343. ISBN 9781845935429. 
  2. ^ Kenn Kaufman & Kimberly Kaufman (2012). Kaufman Field Guide to Nature of New England. Houghton Mifflin Harcourt. p. 364. ISBN 9780618456970. 
  3. ^ "Pill millipede (Glomeris marginata)". ARKive. Retrieved June 21, 2007. 
  4. ^ Edward M. Barr (2001). Animal behavior desk reference: a dictionary of animal behavior, ecology, and evolution (2nd ed.). CRC Press. p. 142. ISBN 978-0-8493-2005-7. 
  5. ^ 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. PMC 3127403Freely accessible. PMID 20233103. doi:10.1673/031.008.4401. 
  6. ^ P. J. Hayward & John Stanley Ryland (1995). "Crustaceans". Handbook of the marine fauna of north-west Europe. Oxford University Press. pp. 289–461. ISBN 978-0-19-854055-7. 
  7. ^ Marilyn Schotte (2012). M. Schotte, C. B. Boyko, N. L. Bruce, G. C. B. Poore, S. Taiti & G. D. F. Wilson, eds. "Armadillidiidae". World Marine, Freshwater and Terrestrial Isopod Crustaceans database. World Register of Marine Species. Retrieved September 26, 2012. 

External links[edit]