Reproductive Biology

Bisexual, parthenogenetic, and mixed populations of common pygmy woodlice exist. Parthenogenetic populations in Britain are composed almost entirely of females. Two to three broods are typical, breeding occurring between May and September. Eggs number between 4 and 17 and are approximately 0.01 in (0.3 mm) in diameter. An average female produces five to seven juveniles per brood.

CONSERVATION STATUS Not listed by the IUCN.

SIGNIFICANCE TO HUMANS None known. ♦

Resources

Books

Alikhan, M. A., ed. Crustacean Issues 9: Terrestrial Isopod Biology. Rotterdam, The Netherlands: A. A. Balkema, 1995.

Raham, R. G. "Pill Bug Strategies." In Dinosaurs in the Garden: An Evolutionary Guide to Backyard Biology. Medford, NJ: Plexus Publishing, 1988.

Warburg, M. R. Evolutionary Biology of Land Isopods. Berlin: Springer-Verlag, 1993.

Periodicals

Brooks, R. A. "Colonization of a Dynamic Substrate: Factors Influencing Recruitment of the Wood-Boring Isopod, Sphaeroma terebrans onto Red Mangrove (Rhizophora mangle)." Oecologia 127 (2001): 522-532.

Hassall, M., and S. P. Rushton. "The Role of Coprophagy in the Feeding Strategies of Terestrial Isopods." Oecologia 53 (1982): 374-381.

Holomuzki, J. R., and T. M. Short. "Habitat Use and Fish Avoidance Behaviors by the Stream-Dwelling Isopod Lirceus fontinalis." Oikos 52 (1988): 79-86

McDermott, J. J. "Biology of Chiridotea caeca (Say, 1818) (Isopoda: Idoteidae) in the Surf Zone of Exposed Sandy Beaches along the Coast of Southern New Jersey, U.S.A." Ophelia 55 (2001): 123-135.

Sparkes, T. C., D. P. Keogh, and R. A. Pary. "Energetic Costs of Mate Guarding Behavior in Male Stream-Dwelling Isopods." Oecologia 106 (1996): 166-171.

Thiel, M. "Reproductive Biology of a Wood-Boring Isopod, Sphaeroma terebrans, with Extended Parental Care." Marine Biology 135 (1999): 321-333.

Zimmer, M., S. Geisler, S. Walter, and H. Brendelberger. "Fluorescence in Asellus aquaticus (Isopoda: Asellota): A First Approach." Evolutionary Ecology Research 4 (2002): 181-187.

Organizations

British Myriapod and Isopod Group. E-mail: [email protected] Web site: <http://www.salticus.demon.co.uk>

Inland Water Crustacean Specialist Group. Denton Belk, 840 E. Mulberry Ave., San Antonio, TX 78212-3194 USA. Phone: (210) 732-8809. Fax: (210) 732-3943. Web site: <http://www.iucn.org/themes/ssc/pubs/sgnewsl.htm>

International Isopod Research Group. Web site: <http://www .uni-kiel.de/zoologie/institut/limnologie/IIRG.htm>

Other

"World List of Marine, Freshwater and Terrestrial Isopod Crustaceans." Department of Systematic Biology, Invertebrate Zoology, Smithsonian National Museum of Natural History. [1 Aug. 2003]. <http://www.nmnh.si.edu/ iz/isopod/>

Leslie Ann Mertz, PhD

Phylum Arthropoda Subphylum Crustacea Class Malacostraca Order Amphipoda Number of families 155

Thumbnail description

Diverse group of crustacean arthropods ranging in size from 0.2 in (5 mm) to 9.8 in (25 cm) in length

Photo: Skeleton shrimps (Caprella sp.) have raptor like claws, presumably used to capture prey (copepods, crustacea larvae, worms, amphipods, etc.) floating by in the current. (Photo ©Tony Wu/www.silent-symphony.com. Reproduced by permission.)

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