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This review analyses the mechanisms of neurogenesis, the morphology of serotonergic interneurons, the number of motoneurons, and cellular features and development of the lateral eyes of Chelicerata.
The authors state that arthropods have the capacity of recognizing self from non-self in various defense phenomena including hemolymph clotting, phagocytosis, encapsulation, melanization and clearance of the foreign matter which must be initiated by a first step of molecular recognition.
very reduced abdomen - typically have 1 pair chelicerae (3-segmented), 1 pair ovigers, 4 pair walking legs, and simple eyes - unusual reproductive biology: males brood embryos on special legs (ovigers); only arthropod group with sole male parental care!