What is a annelids body covering?

The annelids include earthworms, polychaete worms, and leeches. ... Besides being segmented, the body wall of annelids is characterized by being made up of both circular and longitudinal muscle fibers surrounded by a moist, acellular cuticle that is secreted by an epidermal epithelium.

1. Do annelids have an external covering?
2. How many body layers do annelids have?
3. What is unique about the body of annelids?
4. What do annelids look like?
5. What type of skeleton do annelids have?
6. What type of body cavity do Cnidaria have?
7. Do annelids have 3 tissue layers?
8. What is the function of an earthworm's epidermis?
9. What makes up the skeleton that is used by annelids for movement?
10. How do Polychaetes breathe?
11. What animal eats annelids?
12. What is annelids function?
13. Are annelids cold blooded?

Do annelids have an external covering?

Annelids have a body covered by an external cuticle that is never shed or molted. Epidermal microvilli secrete a network of fibers that are in part collagenous and also contain scleroprotein.

How many body layers do annelids have?

Annelids are triploblastic (3 body layers), multicellular animals with some tissue differentiation. They are bilaterally symmetrical and round in transverse section.

What is unique about the body of annelids?

The Annelids are bilaterally symmetrical, triploblastic, coelomate, invertebrate organisms. They also have parapodia for locomotion. Most textbooks still use the traditional division into polychaetes (almost all marine), oligochaetes (which include earthworms) and leech-like species.

What do annelids look like?

The animals in the Annelida are segmented worms. They have no legs, and no hard skeleton. Unlike mollusks, annelid bodies are divided into many little segments, like rings joined together. There are many other kinds of worms, but only annelids are segmented this way.

What type of skeleton do annelids have?

Annelids have a true coelom, that is, one that is lined with cells originating from the embryonic mesoderm . The coelom is fluid-filled, which creates hydrostatic (water) pressure and acts as a hydrostatic skeleton .

What type of body cavity do Cnidaria have?

Corals, sea anemones and jellyfish belong to a group of animals called cnidarians. They have a simple body consisting of a central gut cavity surrounded by tentacles. A jelly-like substance called mesoglea lies between the outer and inner layers of the body.

Do annelids have 3 tissue layers?

Like flatworms and roundworms, annelids are bilaterally symmetrical and have three tissue layers. However, the tissue layers are organized differently in each of the three groups of worms (Figure 23.16).

What is the function of an earthworm's epidermis?

The first nonspecific barrier of earthworms is the skin covering their entire body. The skin consists of the epidermis and a thin cuticle, which contains mucopolysaccharides acting as an antimicrobial barrier.

What makes up the skeleton that is used by annelids for movement?

Annelid worms have what's known as a hydrostatic skeleton, or hydroskeleton. This kind of skeleton is based on the Greek root hydro-, meaning water.

How do Polychaetes breathe?

The smallest species, and those adapted to burrowing, lack gills, breathing only through their body surfaces. Most other species have external gills, often associated with the parapodia. A simple but well-developed circulatory system is usually present.

What animal eats annelids?

Predators - They are a major part of the diet for many Fish, Moles, Hedgehogs, Black Bird etc. A variety of other Birds, Mammals, Reptiles, other Annelids etc. are Predators of Annelids.

What is annelids function?

The coelomic fluid of annelids plays a role in many important functions—e.g., locomotion and regulation of fluid transfer through the body wall (osmoregulation).

Are annelids cold blooded?

The annelids like earthworm, leech, nereis are ectotherms. Their body temperature fluctuates with temperature of environment.