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

Explain the pre pregnancy height and foetal outcome, Explain the Pre Pregna...

Explain the Pre Pregnancy Height and Foetal Outcome? Maternal height prior to conception, determined by heredity, socio-economic environment and maternal nutritional status, is

What is polymorphisum?, According to the chemistry concept the existence of...

According to the chemistry concept the existence of different kinds of crystal of the same chemical compound is known as polymorphism

What are the main classes into which the phylum is divided, What are the ma...

What are the main classes into which the phylum is divided? What are some examples of each and in which form (polyp or medusae) are they found? Coelenterates are separated into

Hypothetical bacterial cell, A microbiology student isolated a hypothetical...

A microbiology student isolated a hypothetical bacterial cell that seems to quadruple every generation. Knowing that binary fission is an exponential function, derive a mathematica

Endocrine glands - heart, HEAR T - The cells called cardiocytes of atr...

HEAR T - The cells called cardiocytes of atria of the heart secrete peptide hormone called atrial natriuretic factor (ANF) in response of an increased return of the deoxygen

Theory of natural selection, What key idea, contained in Malthus's essay on...

What key idea, contained in Malthus's essay on populations, helped Darwin formulate his theory of natural selection?

Cycling of nutrients, Pick up just a tiny bit of soil and you will discover...

Pick up just a tiny bit of soil and you will discover a whole new world. Researchers have found that one pinch of soil may contain more than 30,000 protozoa, 50,000 algae, 400,000

How to lower the risk of drug-nutrient interactions, How to Lower the Risk ...

How to Lower the Risk of Drug-Nutrient Interactions? Eat a healthy diet using the food guide pyramid. Follow directions on how to take medication (prescription and ove

Phases of cell cycle, The cell goes through many discrete phases before and...

The cell goes through many discrete phases before and after cell division. From this understanding, scientists then identified the four characteristic phases of the cell cycle:

EMBRYOLOGY., WHAT ARE THE TYPES OF EGG ON THE BASIS OF YOLK ?

WHAT ARE THE TYPES OF EGG ON THE BASIS OF YOLK ?

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