What is class polychetae - marine worms, Biology

Assignment Help:

What is Class Polychetae - Marine Worms?

The polychaetes differ from the oligochaetes in several ways. The name itself suggests one of the differences. The prefix "poly" means "many," as opposed to "oligo," meaning "few." Thus, the polychaetes have many hair-like bristles. They also have paired appendages called parapodia that bear the numerous setae. Parapodia have several functions, including helping the worms swim or crawl, as well as providing an anchoring mechanism. Parapodia, in addition, provide increased surface area for gas exchange. Most polychaetes live in marine habitats, and they can be found either living as plankton, crawling on the sea floor, or living in tubes, which the worms secrete around themselves.

Polychaetes also differ from the other two groups in that their anterior is better developed. They have a definite head region with sensory apparatus that include light-sensitive eyes.

 

 


Related Discussions:- What is class polychetae - marine worms

Bantham and hookers classification systeam, discribe tha bantham and hooker...

discribe tha bantham and hookers systeam of classification

Aschelminthes, in what part of the human body aschelminthes found?

in what part of the human body aschelminthes found?

Etiological factor of gastritis, Q. Etiological factor of gastritis? Th...

Q. Etiological factor of gastritis? They are same as acute. Generally acute gastritis if well treated gets healed in 3-4 days, however if untreated can progress to chronic gast

What is rflp, Question 1 Write a short note on the following              ...

Question 1 Write a short note on the following                    1 Microinjection                    2 Bio catalysis Question 2 What is RFLP? With help of schematic diagr

What is gum ghatti, What is Gum ghatti Gum ghatti, also known as Indian...

What is Gum ghatti Gum ghatti, also known as Indian gum, is amorphous, translucent exudates of the Anogeissus latifolia tree of the Combretaceae  family. Gum Ghatti is composed

How many different genotypes are possible, If three different traits are co...

If three different traits are controlled by the unlinked genes A, B, and C, and each has multiple alleles so that A has 4 alleles, B has 6 alleles and C has 2 alleles, how many dif

Organ level -level of body organization, Organ level -Level of body organiz...

Organ level -Level of body organization When organs work together to perform a specific function we have the highest level of body organization i.e. the organ system level of bo

Prospects of meat products, P r o s p ec ts of meat products The ...

P r o s p ec ts of meat products The demand for convenience meat based fast food is ever increasing due to rapid industrialization and urbanization, higher standards of l

Pennetula, identifying characters of pennetula

identifying characters of pennetula

Define brain stem, Define Brain Stem Brain stem consists of three parts...

Define Brain Stem Brain stem consists of three parts i.e. midbrain, pons and medulla oblongata. The functions of the Brain Stem are: Brain stem contains points of cranial

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd