Oct 20 - Animals Lecture #11

Oligochaetes nephiridia are greatly coiled and well

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Oligochaetes :nephiridia are greatly coiled and well vascularized o Terrestrial and freshwater species produce a hypsomotic urine o reabsorption of selected salts takes place in metanephridia o - in some forms, nephridiopores are enteronephric
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Phylum Annelida Unique annelid head and paired epidermal setae present (lost in leeches) o Parapodia present in ancestral condition Marine, freshwater, and terrestrial Most free living, some symbiotic, ectoparasitic Body bilaterally symmetrical, metameric with distinct head Triploblastic body Coelom well developed and divided by septa except in leeches o Coelomic fluid functions as hydrostatic skeleton Epithelium secretes outer transparent, moist cuticle Digestive system complete and not segmentally arranged Nervous system has double ventral nerve cord and pair of ganglia with lateral nerves in each segment Sensory system of tactile organs, taste buds, statocysts, photoreceptor cells, and eyes with lenses (in some) Asexual reproduction by fission and fragmentation o Capable of complete regeneration o Asexual reproduction by budding in some Hermaphroditic or separate sexes Respiratory gas exchange through skin, gills or parapodia Circulatory system closed with muscular blood vessels and aortic arches(hearts)
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  • Fall '08
  • Annelid, coelomic fluid, Longitudinal muscles, longitudinal muscles contract, Peristaltic Contraction, Forces coelomic fluid

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