Phylum Nemertea (Rhynchocoela)

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Typical nemerteans (From Brusca and Brusca 2002) Probably the biggest evolutionary advancement of nemerteans is the ability to grow in great size (30m) without segmentation or large body cavity Size range- less
<strong>Nemertea</strong>n Bauplan “Functionally” acoelomates With true coelomic cavities (rhynchocoel, blood vessels) but with relatively solid bodies A number of Bauplan “improvements” solve surface/volume ratio Circulatory system, protonephridia remove waste from blood, rather than the mesenchyme tissues (flatworms). a) No relying on diffusion for internal transport and exchange b) complete gut, so anterior end is specialized on feeding and ingestion, c) development of layered muscles after the reduced reliability on diffusion for transport though mesenchyme Result: Relatively large animals (up to 30 m), with complex feeding and digestive activities
Page 1: Phylum Nemertea (Rhynchocoela) Gree
Page 6 and 7: Feeding and digestion Proboscis is
Page 8 and 9: Comparison of Proboscis Types Credi
Page 10 and 11: Circulation and Gas Exchange Nemert
Page 12 and 13: Excretion and Osmoregulation 2 to 1
Page 14 and 15: Cerebral organs of nemerteans Most
Page 16 and 17: Epidermis Frontal gland Esophagus R
Page 18 and 19: Development Paleonemertea, Hoplonem
Page 20 and 21: Late-stage Cerebratulus sp. Pilidiu
Page 22 and 23: Nemertean Taxonomy Nemerteans are c
Page 24 and 25: Are Nemerteans sister taxa with fla

Phylum Nemertea (Rhynchocoela)

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