Abstract
Leptosomatum bacillatum (Enoplida: Leptosomatidae) occurs in high densities in the sponge Halichondria panicea. Previously observed fluctuations in modal length suggested an annual reproductive cycle which in this study is confirmed by monthly samplings. Eggs are deposited in July and August and L. bacillatum reaches maturity after one year. Mature females continue growing, their length being season dependent. The bionomics, mucus trap hypothesis and nematode-sponge relationship are discussed.
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