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GUNNAR SUNDNES 1984 12 29. The larvae of Halocladius (Halocladius) variabilis (Diptera: Chironomidae) from the foulingassemblages on wooden test panels submerged in Trondheimsfjorden. -Sarsia 69:155-158. Bergen. ISSN 0036-4827.For the first time in Norway the occurrence of chironomid larvae and pupae of Halocladius (Halocladius) variabilis has been recorded from timber test panels exposed for varying periods in Trondheimsfjorden (western Norway) during 1977-78, at depths ranging from 1.5 to 10 m at low tide. Settlement was observed throughout the year. The larvae were present among a variety of fouling communities ranging from a thin film of algae and silt to extremely heavy settlement of coelenterates, serpulids, barnacles, bivalves, bryozoans, ascidians, or algae together with a thick layer of silt and faeces of polychaetes, ascidians, and wood-borers. The larvae made their tubes either in shallow grooves on the timber surface or in the angle between the upturned edges of bryozoan colonies and the wood surface. Larvae and pupae even settled on panels pressure-treated with creosote and Boliden salt. The larvae were unaffected when placed in distilled water and could withstand salinities as high as 70.5 %0 when transferred directly from distilled water and 97.0 %0 after acclimation.

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Marine borers, particularly the shipworms, as destroyers of timber, par excellence, are well known from very ancient times. They attacked the wooden hulls of ships with such intensity that the weakened bottom planks broke up even due to a mild impact caused by hitting a rock or any floating objects inducing shipwrecks. Even the survival of sunken ships as wrecks depends on the mercy of wood-destroying organisms, which may turn these 'port-holes' to history into meaningless junks. The silent saboteurs, involved in several early shipwrecks, are the molluscan and crustacean borers, aided by bacteria and fungi.1. Chelura terebrans Philippi, 2.Tropichelura insulae (Calman), 3.Tropichelura gomezi Ortiz, and 4.Nippochelura brevicauda Shiino.