Classification of nereis
What is the class of Nereis?
Polychaeta is a paraphyletic class of generally marine annelid worms, commonly called bristle worms or polychaetes. Each body segment has a pair of fleshy protrusions called parapodia that bear many bristles, called chaetae, which are made of chitin. More than 10,000 species are described in this class.
What are the characteristics of Nereis?
Nereis worms are commonly known as rag worms or clam worms. The body is long, slender, and dorso-ventrally flattened, reaching a length of 5-30 cm. The head consists of two parts: a roughly triangular anterior lobe—the prostomium—and a posterior ring-like portion—the peristomium.
What is Nereis in zoology?
Nereis is a type of marine worm also called a clam worm, sandworm or ragworm. It has a segmented body and is a true coelomate worm. As a result, it belongs to the phylum Annelida.
What is the other name of Nereis?
clam worm
rag worm, also called clam worm (genus Nereis), any of a group of mostly marine or shore worms of the class Polychaeta (phylum Annelida). A few species live in fresh water. Other common names include mussel worm, pileworm, and sandworm.
What are the four classes of Annelida?
Classification of Annelida
- Polychaeta.
- Oligochaeta.
- Hirudinea.
- Archiannelida.
What are the main characteristics of annelids?
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.
Where are Nereis found?
Nereis vexillosa is often found in burrows in the sand or in association with mussels and barnacles.
Is Nereis an annelid?
Answer: Nereis is an aquatic annelid. Its parapodia help it swim. Nereis is a genus of Polychaeta worms in the family Nereidae.
Is Nereis dioecious?
Both reproduce sexually. Earthworms and Nereis are monoecious and dioecious, respectively. Monoecious organisms have both male and female reproductive organs in the same individual. They are also known as hermaphrodites.
What are the characteristics of earthworm?
An earthworm has a streamlined body with no antennae or fins or arms or legs! This streamlined shape is an adaptation to living in narrow burrows underground and the need to move easily through the soil. An earthworm has circular muscles that surround each body segment.
Where are Nereis found?
Nereis vexillosa is often found in burrows in the sand or in association with mussels and barnacles.
What kind of food is taken by Nereis?
Nereis is carnivorous and devours small animals like crustacea and small molluscs.
How do Nereis breathe?
Respiratory System of Nereis
Gills are absent in Nereis . The function of respiration is taken over by the lobes of parapodia and dorsal integument. For this reason, these regions are richly supplied with blood vessels.
Is Nereis an annelid?
Answer: Nereis is an aquatic annelid. Its parapodia help it swim. Nereis is a genus of Polychaeta worms in the family Nereidae.
Is Nereis parasitic?
Parasitic. Hint: Nereis or Neanthes Fucata is the simplest segmented marine polychaete ringworm. They have around 200 segments or metameres. The initial segment of its body has been fused to form its head consisting of the eyes and peristomium (part of the head in Phylum Annelida).