Behavioural adaptations and diet specificity of sacoglossan opisthobranchs

摘要: Sacoglossan opisthobranchs are suctorial feeders and the majority of species feed on cytoplasm siphonalean green algae. All shelled sacoglossans morphologically variable, but anatomically strictly monosiphonaceous algal genus Caulerpa. Thus stenophagy is plesiomorphic within group. After losing shell, an adaptive radiation diets has taken place. Most shellless stenophagous, some, in particular with temperatt distributions, relatively euryphagous. A number behavioural adaptations have been involved evolution Sacoglossa. Those most important for diet are: food handling methods, such as grasping filament oral pedal lobes, “cutting” cell wall instead “rasping” through it. Buccal regurgitation, which probably mixes saliva also important. The specificity Sacoglossa involves morphological well physiological adaptati...