Phylum Nemertea (Rhynchocoela)
Phylum Nemertea (Rhynchocoela) Phylum Nemertea (Rhynchocoela)
Comparison of Proboscis Types Credit: R. Ritger from adaptation in Gibson, 1972 (Nemerteans, Hutchinson, Univ Press) Palaeo/Heteronemertea Heteronemertea Hoplonemertea
Digestive system Anus is present (unlike flatworms), one way traffic of food results in structure specialization Mouth opens to ectodermic foregut (buccal cavity, esophagus, stomach) Stomach leads to straight, elongate intestine or midgut with numerous diverticula Midgut leads to the ectodermic hindgut or rectum which ends in the anus Digestive tube is ciliated In predatory nematodes, endopeptidases break down the ingested proteins in the lumen and then phago- and pinocytosis in midgut. Food is stores mostly in fat.
- Page 1 and 2: Phylum Nemertea (Rhynchocoela) Gree
- Page 3: Nemertean Bauplan “Functionally
- Page 6 and 7: Feeding and digestion Proboscis is
- 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
Digestive system<br />
Anus is present (unlike flatworms), one way<br />
traffic of food results in structure<br />
specialization<br />
Mouth opens to ectodermic foregut (buccal<br />
cavity, esophagus, stomach)<br />
Stomach leads to straight, elongate intestine<br />
or midgut with numerous diverticula<br />
Midgut leads to the ectodermic hindgut or<br />
rectum which ends in the anus<br />
Digestive tube is ciliated<br />
In predatory nematodes, endopeptidases<br />
break down the ingested proteins in the<br />
lumen and then phago- and pinocytosis in<br />
midgut. Food is stores mostly in fat.
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