Which class belongs to phylum Annelida?
class Polychaeta
Phylum Annelida contains the class Polychaeta (the polychaetes) and the class Oligochaeta (the earthworms, leeches and their relatives).
How are annelids classified?
Critical appraisal. 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.
How many species of annelids are there?
A major invertebrate phylum of the animal kingdom, the annelids number more than 9,000 species distributed among three classes: the marine worms (Polychaeta), which are divided into free-moving and sedentary, or tube-dwelling, forms; the earthworms (Oligochaeta); and the leeches (Hirudinea).
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 5 characteristics of phylum Annelida?
Characteristics of Phylum Annelida
- They have a long and segmented body.
- Annelids are bilaterally symmetrical.
- They are triploblastic.
- Also, they exhibit organ system grade of organisation, showing organ differentiation.
- The body is covered with a thin cuticle.
- They are coelomate.
Why does earthworm belong to phylum Annelida?
Phylum: Annelida Annelids are segmented worms. Earthworms belong to this phylum because their bodies are sectioned, creating the ridged or ringed appearance that gives the “ringed worms” of this phylum their name.
What phylum do Polychaetes belong to?
Polychaete, any worm of the class Polychaeta (phylum Annelida). About 8,000 living species are known. Polychaetes, which include rag worms, lugworms, bloodworms, sea mice, and others, are marine worms notable for well-defined segmentation of the body.
What are five characteristics of phylum Annelida?
Characteristics of Annelida
- The Annelids are coelomate and triploblastic.
- They exhibit organ system level organization.
- Their body is segmented.
- They respire through their body surface.
- Nephridia are the excretory organs.
- They have a well-developed circulatory and digestive system.
What are examples of organisms found in phylum Annelida?
Examples of Annelids
- Earthworm.
- Leeches.
- Lugworms.
- Polychaetes.
How the members of phylum Mollusca are different from the members of phylum Annelida?
Mollusks are protostomes. The dorsal epidermis in mollusks is modified to form the mantle, which encloses the mantle cavity and visceral organs. This cavity is distinct from the coelomic cavity, which the adult animal retains, surrounding the heart. The phylum Annelida includes worm-like, segmented animals.
What are the four classes of phylum Annelida?
There are three classes of annelids:
- Class Polychaeta: marine annelids;
- Class Oligochaeta: marine, freshwater and terrestrial annelids including earthworms;
- Class Hirudinea: marine, fresh water and terrestrial leeches.
Which animals belong to the Annelida phylum?
Annelids belong to the phylum Annelida and they are the diverse group of organisms. This group contains species like earthworms, leeches, and marine worms. Further the annelids can be classified in to three classes.
What are some common examples of phylum Annelida?
Aulophorus, Tree worm, and Leech are common Annelida Examples.triploblastic and bilateral symmetry is common characteristics of annelids. This is a Complete Guide About Phylum Annelida Examples and Characteristics.
What are the three classes of the phylum Annelida?
Class Polychaeta: marine annelids;
What type of reproduction is used in phylum Annelida?
Reproductive System: Annelida reproduce sexually . They are hermaphroditic , meaning they have both male and female reproductive organs. Their clitelum creates mucus that is used both to help with copulation and to create a cocoon for egg incubation.