Polychaetes - feeding and digestion in annelids, Biology

Polychaetes - Feeding and Digestion in Annelids

Polychaetes involve both free moving (errant) and sedentary species. The free moving species are usually macrophagous and the sedentary forms are microphagous. Nereis is an example of a free moving macrophagous polychaete. But Nereis can as well burrow and make use of its proboscis (buccal cavity and pharynx) for this aim. The eversible proboscis is a feeding organ. The pharynx is lined along with hooked jaws and is everted for seizing the prey. The genus Nereis includes species that are carnivorous. Some species of Nereis are omnivorous, feeding on diverse material like algae, invertebrates or detritus on the substratum. Some are scavengers. The tentacles and palps present around the mouth assist in the manipulation of food, besides serving sensory function.

Posted Date: 2/4/2013 3:06:05 AM | Location : United States







Related Discussions:- Polychaetes - feeding and digestion in annelids, Assignment Help, Ask Question on Polychaetes - feeding and digestion in annelids, Get Answer, Expert's Help, Polychaetes - feeding and digestion in annelids Discussions

Write discussion on Polychaetes - feeding and digestion in annelids
Your posts are moderated
Related Questions
Q. Is Acetylcholine found in brain? Acetylcholine is found in many parts of the brain having particularly high concentrations in the cerebral cortex, limbic system, basal, foreb

Define the Larval stages of fasciola hepatica? Fasciola hapatica reproduces both sexual and asexually. Cross-fertilization is of common occurrence. Copulation takes place in t

Explain the Mode of Feeding or Nutrition Support? Do you recall studying about the nutrition support methods, namely enteral and perenteral feeding? These two methods form the

Imagine a population evolving by genetic drift in which the frequency of allele K is 0.65. What is the probability that at some point in the future allele K will drift to a frequen


Explain Precautions for preparation of general purpose media 1. Dissolve ingredients one by one in distilled water. 2. Check and set the medium to appropriate pH. 3. Auto

Define Bone growth and development calcification of osteoid tissue? Vitamin D participates in metabolic processes associated with bone growth and development. It is involved i

Q. What are the major purposes of the organic molecules for living beings? Ans. Organic molecules, like, lipids, carbohydrates and proteins perform several functions for

It is found in around 20 per cent cases of ARF and it is a late manifestation occurring even 3 months after GAS pharyngeal infection. Chorea is triggered by emotional disturbances

Widal test is used for the diagnosis of: 1. Malaria 2. Pneumonia 3. Tuberculosis 4. Typhoid Typhoid