Phylum Nemertea (Rhynchocoela)

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Nemertean Taxonomy Nemerteans are classified according to the relation of the nervous system to the musculature, and the structure of the proboscis. Class Anopla - ‘Unarmed’ Gr. These animals are characterized by a mouth lying posterior to the brain, a CNS located directly below the epidermis, and a proboscis that bears no stylets but instead works as a wrap-around lasso. 2 Orders: Palaeonemertea, Heteronemertea E.g. Baseodiscus Class Enopla - ‘Armed’ Gr. The enoplans have a mouth that lies anterior to the brain. The CNS is located within the muscular layer, and the proboscis is armed in some species. Where an armed proboscis does occur, a poison sac lies directly below the stylet, and poison is ejected into wounds created by the stylet. 2 Orders: Hoplonemertea, Bdellonemertea Ex. Prostoma - a fresh water armed nemertean. Geonemertes - a tropical terrestrial genus of armed nemertean, which lives under rocks and stones. Pelagic nemertean
Are Nemerteans sister taxa with flatworms? First scenario • Origin of triploblasty, spiralian condition, a= Acoelomate ancestor b = ancestor and then flatworms retains all ancestral characters from 1 3. Proboscis, circulatory system, anus (synapomorphies) for Nemertea 4. Coelom Alternative scenario 1. Origin of triploblasty, spiralian condition, schizocoely 2. Loss of coelom (so ancestor b and its descendants phyla are acoelomates)
Page 1 and 2: Phylum Nemertea (Rhynchocoela) Gree
Page 3: Nemertean Bauplan “Functionally
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 24 and 25: Are Nemerteans sister taxa with fla

Phylum Nemertea (Rhynchocoela)

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