What is the Difference Between Polychaetes and Oligochaetes

The main difference between polychaetes and oligochaetes is that the polychaetes have a pair of parapodia per body segment that bear many bristles. But, oligochaetes have few bristles on their outer surface of the body but, no parapodia. ... Polychaetes and oligochaetes are two subclasses of phylum Annelida.

What differentiates Polychaetes from other annelids?
How do Polychaetes differ from earthworms?
What is the main function of Chaetae in Oligochaetes?
Do Oligochaetes have Chaetae?
Do annelids have a true Coelom?
Do Polychaetes have Parapodia?
Why do you see so many earthworms after a long rainy period?
Do worms have lungs?
Do earthworms have Chaetae?
How many hearts does an earthworm have?
What does annelida mean?
Do annelids have open circulatory system?

What differentiates Polychaetes from other annelids?

Polychaetes differ from other annelids in having a well differentiated head with specialized sense organs and no clitellum. They have many setae, usually arranged in bundles on the parapodia. The head bears eyes, antennae, and sensory palps.

How do Polychaetes differ from earthworms?

Earthworms differ from polychaetes in that they do not have parapodia but DO possess a clitellum, which is used in reproduction. ... Unlike polychaetes, earthworms lack gills and take in oxygen through their skin, one reason why they most live in moist soils.

What is the main function of Chaetae in Oligochaetes?

chaeta (pl. chaetae) A bristle, made of chitin, occurring in annelid worms. In the earthworm they occur in small groups projecting from the skin in each segment and function in locomotion.

Do Oligochaetes have Chaetae?

Oligochaetes are bilaterally symmetrical, segmented coelomates with usually four bundles of chaetae on every segment except the first. In a few exceptional forms, the chaetae are absent in some or even all segments. Each bundle contains several to more than a dozen chaetae.

Do annelids have a true Coelom?

Annelids show the presence of a true coelom, derived from embryonic mesoderm and protostomy. Hence, they are the most advanced worms. A well-developed and complete digestive system is present in earthworms (oligochaetes) with a mouth, muscular pharynx, esophagus, crop, and gizzard being present.

Do Polychaetes have Parapodia?

The Polychaeta /ˌpɒlɪˈkiːtə/, also known as the bristle worms or polychaetes, are a paraphyletic class of annelid worms, generally marine. Each body segment has a pair of fleshy protrusions called parapodia that bear many bristles, called chaetae, which are made of chitin.

Why do you see so many earthworms after a long rainy period?

When the rain hits the ground it creates vibrations on the soil surface. This causes earthworms to come out of their burrows to the surface. Earthworms find it easier to travel across the surface of the soil when it is wet, as they need a moist environment to survive.

Do worms have lungs?

How do earthworms breathe? Earthworms do not have lungs; instead, they breathe through their skin. Their skin needs to stay moist to allow the passage of dissolved oxygen into their bloodstream.

Do earthworms have Chaetae?

In the earthworm they occur in small groups projecting from the skin in each segment and function in locomotion. The chaetae of polychaete worms (e.g. ragworm) are borne in larger groups on paddle-like appendages (parapodia).

How many hearts does an earthworm have?

Heartbeats: Worms don't have just one heart. They have FIVE! But their hearts and circulatory system aren't as complicated as ours -- maybe because their blood doesn't have to go to so many body parts. Moving around: Worms have two kinds of muscles beneath their skin.

What does annelida mean?

Annelid, phylum name Annelida, also called segmented worm, any member of a phylum of invertebrate animals that are characterized by the possession of a body cavity (or coelom), movable bristles (or setae), and a body divided into segments by transverse rings, or annulations, from which they take their name.

Do annelids have open circulatory system?

Much like humans, annelids have a closed circulatory system, which means the blood circulates through a closed network of blood vessels. ... The heart-like structures in the earthworm are called aortic arches, which pump blood out into the network of vessels that run in a circuit through the body.