What general characteristic did the first animal phyla call annelids have?

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.

1. What are the general characteristics of phylum Annelida?
2. What special characteristic is phylum Annelida named after?
3. What feature appeared first in annelids?
4. What do all annelids have in common?
5. What are the characteristics of phylum Annelida and Arthropoda?
6. What is the representative organism for annelids?
7. What characteristics of phylum Annelida distinguish it from other phyla?
8. What type of animals are annelids?
9. What is the most distinguishing characteristic of annelids Why is it important?
10. Which of the following characteristics are not present in the phylum Annelida?
11. Which one of the following belongs to phylum Arthropoda?
12. Which characteristic applies to roundworms?
13. How does the function of an earthworm's crop differ from that of its gizzard?

What are the general 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.

What special characteristic is phylum Annelida named after?

Phylum Annelida includes segmented worms. These animals are found in marine, terrestrial, and freshwater habitats, but a presence of water or humidity is a critical factor for their survival, especially in terrestrial habitats. The name of the phylum is derived from the Latin word annellus, which means a small ring.

What feature appeared first in annelids?

An important evolutionary development in annelids, that is not obvious when you see the animal from the outside, is the presence of a well-developed coelom, or body cavity. Along with mollusks, annelids are among the first animals to have a coelom.

What do all annelids have in common?

Annelids are segmented worms such as earthworms and leeches. Annelids have a coelom, closed circulatory system, excretory system, and complete digestive system. They also have a brain.

What are the characteristics of phylum Annelida and Arthropoda?

Both Annelida and Arthropoda consist of bilateral symmetry. Both Annelida and Arthropoda consist of triploblastic animals with three germ layers. Both Annelida and Arthropoda have organ system level of organization. Both Annelida and Arthropoda consist of segmented body structures.

What is the representative organism for annelids?

The annelids /ˈænəlɪdz/ (Annelida /əˈnɛlɪdə/, from Latin anellus, "little ring"), also known as the ringed worms or segmented worms, are a large phylum, with over 22,000 extant species including ragworms, earthworms, and leeches.

What characteristics of phylum Annelida distinguish it from other phyla?

What characteristics of phylum Annelida distinguish it from other phyla? It has a 2-part head and there's a coelomic compartment in each segment surrounded by a layer of mesodermal epithelium. The body wall and coelom contain strong circular and longitudinal muscles for swimming and burrowing.

What type of animals are annelids?

The annelids include earthworms, polychaete worms, and leeches. All members of the group are to some extent segmented, in other words, made up of segments that are formed by subdivisions that partially transect the body cavity. Segmentation is also called metamerism.

What is the most distinguishing characteristic of annelids Why is it important?

What is the most distinguishing characteristic of annelids? Why is it important? Segmentation; each segment has its own muscles that lengthen and shorten for efficient movement; groups of segments may take on specific function.

Which of the following characteristics are not present in the phylum Annelida?

But the animals belonging to phylum Annelida that have true or well-developed coelom are called coelomates. Thus being 'pseudocoelomate' is the only character not possessed by animals of the phylum Annelida. Hence, the correct answer is option A, i.e., Pseudocoelomate.

Which one of the following belongs to phylum Arthropoda?

The phylum Arthropoda contains a wide diversity of animals with hard exoskeletons and jointed appendages. Many familiar species belong to the phylum Arthropoda—insects, spiders, scorpions, centipedes, and millipedes on land; crabs, crayfish, shrimp, lobsters, and barnacles in water (Fig. 3.72).

Which characteristic applies to roundworms?

Features of Roundworms

Unlike the flatworms, the roundworms have a body cavity with internal organs. A roundworm has a complete digestive system, which includes both a mouth and an anus. This is a significant difference from the incomplete digestive system of flatworms.

How does the function of an earthworm's crop differ from that of its gizzard?

How does the function of an earthworm's crop differ from that of its gizzard? The crop is a temporary storage area for ingested soil; the gizzard grinds the soil, releasing and breaking up organic matter. ... What is the function of an earthworm's aortic arches? They contract and force blood through the circulatory system.