Tissue loss in corals infested by acoelomorph flatworms (Waminoa sp.)
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Little is known about species and host specificity of epizoic acoelomorphs that live in association with corals (Barneah et al. 2012; Hoeksema et al. 2012). Most records concern zooxanthellate acoels of the genus Waminoa Winsor, 1990, which reproduce both sexually and asexually and may harm their hosts by shading and by eating their protective mucus layer, but no coral injuries have been reported so far (Haapkylä et al. 2009; Naumann et al. 2010).
Apparently, acoels can harm corals by smothering them, which may hinder their respiration, feeding and sediment shedding capacities. The infestation may be contagious, since a Sandalolitha robusta (Quelch, 1886) mushroom coral, with more than 90 % acoel cover was observed to be in close contact with one of another species, Pleuractis granulosa (Klunzinger, 1879), that was only infested at the nearest side, implying that acoels crawled or swam from one coral to another. All presently reported mushroom coral species represent new host records for Waminoa (see Hoeksema et al. 2012).
Observations took place during a Marine Biodiversity Workshop based at the Bitung Field Station, Research Centre for Oceanography (RCO), Indonesian Institute of Science (LIPI).
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