How many types of annelids are there?

1. What are the 2 main groups of annelids?
2. What are the 3 classes of annelids?
3. What are 5 characteristics of phylum Annelida?
4. What is the difference between Polychaetes and Oligochaetes?
5. What type of symmetry do annelids exhibit?
6. How many pairs of legs do annelids have?
7. Why are leeches classified as annelids?
8. What are the most common types of annelids?
9. What is annelids common name?
10. Are earthworms vertebrates or invertebrates?

What are the 2 main groups of annelids?

For the purposes of this concept, we will consider two main classes of annelids: Polychaetae and Clitellata. The Clitellata are characterized by the presence of a specialized reproductive organ called the clitellum.

What are the 3 classes of annelids?

Most authors accept the annelids as having three major classes: Polychaeta, Oligochaeta, and Hirudinea. Older systems would place the polychaetes and oligochaetes under the class Chaetopoda because both groups possess setae.

What are 5 characteristics of phylum Annelida?

They are mostly aquatic; marine or freshwater some terrestrial, burrowing or tubicolous, sedentary or free-living, some commensal and parasitic. The body is elongated, triploblastic, bilaterally symmetrical, truly coelomate and vermiform.

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 type of symmetry do annelids exhibit?

Annelids display bilateral symmetry and are worm-like in overall morphology. Annelids have a segmented body plan wherein the internal and external morphological features are repeated in each body segment.

How many pairs of legs do annelids have?

- They have 14-43 pairs of simple conical walking legs. These are not jointed or segmented but are instead saclike and contain coelomic fluid and external muscle insertions.

Why are leeches classified as annelids?

Helobdella sp. Leeches are segmented parasitic or predatory worms that comprise the subclass Hirudinea within the phylum Annelida. ... The body is muscular and relatively solid, and the coelom, the spacious body cavity found in other annelids, is reduced to small channels.

What are the most common types of annelids?

Earthworms. Earthworms are probably the best known and most common of the annelids; more than 2,700 kinds of earthworms have been identified around the world.

What is annelids common name?

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.

Are earthworms vertebrates or invertebrates?

Both worms and insects are classified under the Kingdom Animalia. The animal kingdom is split into two groups: vertebrate, animals with a backbone, and invertebrate, animals without a backbone. Both worms and insects are invertebrates.