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
Mature Embryo A typical dicotyledonous embryo, as seen in a median longitudinal section, consists of an embryonal axis having two broad cotyledons. The portion of embryonal ax

Explain the effect of Deficiency of pyridoxine? A deficiency of vitamin B6 alone is uncommon because it usually occurs in association with a deficit in other B-complex vitamin

digram or mammalian testis

Phanerophytes - Classes of Life Form The perennating buds in this case are present on erect, negatively geotropic shoots, much above the ground. These buds are naked or least

Define Subphylum Chelicerata - classes Arachinda AM merostomata? The subphylum Chelicerata includes familiar horse shoe crab, spiders, scorpions, ticks and mites. 1. Body consis

What are the constituent elements of the blood? The blood is made of a liquid and a cellular part. The fluid part is known as plasma and in it there are several substances, suc

What are the cell types that form the phloem? What are the main features of those cells? The major cells that form the phloem are the sieve elements and the companion cells. Th

DIFFERENCE BETWEEN LIVING AND NON-LIVING BEINGS - S .No. C h a ra cte r L i v i n g be ings N o n - l i v i n g be

Periimplant Sulcus Fluid Analysis (PISF) This is not a parameter for clinical use but for experimental situations. However, it is important for us to know about it. Several bio

Heat production and respiratory quotient for foodstuff types The heat produced during the metabolic activities of the body helps in maintaining the body temperature. Generally