Phylum Nemertea (Rhynchocoela)
Phylum Nemertea (Rhynchocoela) Phylum Nemertea (Rhynchocoela)
Feeding and digestion Proboscis is used to capture prey, - equipped in some species (Hoplonemertea) with piercing barbs or stylets, which may contain a toxin to subdue the prey. It opens a) through the proboscis pore (in A&B) or b) or associates with the foregut (C and D) Stylets are continuously produced in reserve stylet sacs. Used when needed Made from epithelial cells (styletocytes). Composed of organic core surrounded by crystalline Ca+P
Rhyncocoel The proboscis pore leads to rhynchodeum (anterior lumen), which is continuous with the epidermis, and to proboscis canal The rhynchocoel is a closed, fluid-filled space that is squeezed by the surrounded muscles, causing the eversible proboscis to be rapidly extended. Squeezing increases the hydrostatic pressure of rhynchocoel. Everted proboscis is retrieved by retractor muscle or hydrostatically. The genus Gorgonorhynchus possess an unusual, massively branched proboscis that takes the appearance of a collection of medusa-like snakes, called proboscides. Most predators, some scavengers, few ectoparasites (e.g. Carcinonemertes errans infects all Dungeness crabs) a) A retracted and B) extended proboscis of a hoplonemertean
- Page 1 and 2: Phylum Nemertea (Rhynchocoela) Gree
- Page 3: Nemertean Bauplan “Functionally
- 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
Feeding and digestion<br />
Proboscis is used to capture prey, - equipped in some species (Hoplonemertea) with piercing barbs or<br />
stylets, which may contain a toxin to subdue the prey. It opens a) through the proboscis pore (in A&B)<br />
or b) or associates with the foregut (C and D)<br />
Stylets are continuously produced in reserve stylet sacs. Used when needed<br />
Made from epithelial cells (styletocytes). Composed of organic core surrounded by crystalline Ca+P
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