Comparative 3D microanatomy and histology of the eyes and central nervous systems in coleoid cephalopod hatchlings

摘要: Adaptive radiation of an animal group is the evolutionary variation morphology, physiology, and behavior opening up new habitats resources. An impressive example reciprocal interdependency form function found in anatomy cephalopod visual central nervous systems. Interspecific differences sensory organs signal processing structures reflect eco-functional context, e.g., species-specific demands emanating from habitat foraging behavior. To substantiate this, we investigated eyes brain neuropils early post-hatching stages six coleoid species (Sepia officinalis, Rossia macrosoma, Sepietta obscura, Idiosepius notoides, Loligo vulgaris, Octopus vulgaris), showing different size inhabiting ethoecological niches. Comprehensive 3D structure data sets were produced light microscopic resolution, i.e., semithin section series head region (histology presented for I. R. S. obscura first time) surface renderings neuropils, enabling display all components arbitrary perspectives combinations, comparative volumetic anaylsis homologous lobe neuropils. Differing absolute considerably, systems follow same bauplan adult-like configuration. The sense obviously paramount importance already after hatching, but also, equilibrioception olfaction are well developed. shapes various show that some plasticity distinct volumetric ratios found, subject to their functional relevance lifestyle on brachial swimming motor function, camouflage, as sensoric cognitive abilities.