Abstract
Heterosaccus lunatus is a rhizocephalan barnacle which parasitizes the crab Charybdis callianassa in Moreton Bay, Queensland. Its free-swimming larvae are lecithotrophic and there are 4 naupliar stages before metamorphosis to the cypris stage. Sexes can be distinguished during this larval phase by size, the male larvae being larger at all stages. Experiments determined the effect of differing salinities on larval development of H. lunatus. A development index (D.I.) was calculated for each salinity tested and larval development was arbitrarily deemed successful if the D.I. was greater than 50%, i.e., > 50% of the nauplii became cyprids. Successful larval development occurred over the salinity range 24-40‰.
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