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. ♦
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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>
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Leslie Ann Mertz, PhD
Phylum Arthropoda Subphylum Crustacea Class Malacostraca Order Amphipoda Number of families 155
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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