Frequency distribution of free-living stages in samples of Mysidetes hanseni from ice caves of two Antarctic islands. Numbers of specimens are given for juveniles (J), immature (♂I), subadult (♂S) and adult (♂A) males, for immature (♀I), empty subadult (♀S–) and expectant subadult (♀S+) females and for adult females classified as incubating females bearing unfertilised eggs (♀U–), embryos (♀E–), nauplioid larvae (♀N–) and postnauplioid larvae (♀P), finally for non-incubating reproductive females (♀0+) and non-reproductive (spent) females (♀0–).