The Morphology and Physiology of the Salivary Glands of Hemiptera-Heteroptera

摘要: The salivary glands of the Heteroptera consist a pair primarily bilobed principal and accessory which vary very greatly in form structure different families. are usually supplied with tracheae, invested by nervous plexus is glandular nerve from hypocerebral ganglion stomatogastric system. gland Notonecta characterized presence large cells having zymogen granules storage fluid secretion vacuoles. In contrast, most remaining Heteropteran belong to vesicular type, one-layered epithelium made up small discharge their into central cavity or axial canal. This type lacks but has dense masses reserve material basal outer parts cells. There normally no difference lobes. either thin-walled bladder-like vesicle, tubular duct-like; they seem be purely development primary conducting system, thus homologous reservoir other orders. All information obtained this work strongly against idea that various lobes Hemipterous produce widely chemical substances, each special function. results Faure-Fremiet have not been confirmed. Except blood-sucking forms digestive enzymes were always found glands, two being maximum number any particular gland. related food consumed, those concerned digestion component was present greatest proportion. case cellulase found. An anti-coagulant principle forms. appear only watery secretion, absent. pH generally slightly acid, while neutral. Mitochondria Golgi bodies typical insect tissue certain show relation granules, do contribute synthesis. From experiments it appears action sufficiently rapid for external take place great extent. It seems, however, quite an appreciable quantity injected saliva imbibed again, continues stomach, where taken first stored. activity range general wide.