Abstract
1. 1. The neurosecretory system of the primitive ellobiid Melampus bidentatus (Pulmonata: Basommatophora) was investigated using Alcian blue-Alcian yellow histochemistry. 2. 2. Putative neurosecretory cells within the central ganglia were distinguished by the criteria of cell size, position, and staining reaction. 3. 3. The cerebral ganglia, with attached lateral lobes, contained the greatest diversity of neurosecretory cell types (at least seven), inclucling single cells and cell clusters ranging from two to 40 cells. 4. 4. Four neurosecretory cell types were identified in the parietal and visceral ganglia, two in the pedal ganglia, and one each in the buccal and pleural ganglia. 5. 5. Neuroseeretory system homology among pulmonate gastropods is suggested by the close similarity of the Melampus AB/AY cell map to those reported in the literature for two limnic basommatophorans and for four terrestrial stylommatophorans.
Published Version
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