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Summary
Reproductive events of Nausitora fusticula (Jeffreys, 1860) were observed and studied in the laboratory. They always occured at the same time of the day, from noon to 5 pm, reaching a peak of activity at 3 pm, between February and April. The female has a passive behaviour whereas the male moves its excurrent siphon around very actively. One to six males were observed introducing their excurrent siphons into the incurrent siphon of one female simultaneously. Such behaviour lasted from a few minutes up to over 30 min. Males were also observed to spawn by discharge of spermatozoa into the water of the aquaria.