具真體腔的軟體動物門-資料下載頁
2025-05-07 23:40本頁面
【正文】 bsent in some) ? epithelium usually ciliated and bearing mucous glands and sensory nerve endings ? 5. Coelom limited mainly to area around heart, and perhaps lumen of gonads and part of kidneys ? digestive system。 rasping an (radula) usually present。 anus usually emptying into mantle cavity ? 7. Open circulatory system (mostly closed in cephalopods)of heart (usually three chambered), blood vessels, and sinuses。 respiratory pigments in blood ? exchange by gills, lungs, mantle, or body surface ? or two kidneys (metanephridia) opening into the pericardial cavity and usually emptying into the mantle cavity, ? system of paired cerebral, pleural, pedal, and visceral,ganglia, with nerve cords and subepidermal plexus。 ganglia centralized in nerve ring in gastropods and cephalopods ? ans of touch, smell, taste, equilibrium, and vision (in some)。 eyes highly developed in cephalopods ? 12. Internal and external ciliary tracts often of great functional importance ? 13. Both monoecious and dioecious forms。 spiral cleavage。 larva primitively a trochophore, many with a veliger larva, some with direct development
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