Admin Table of Contents
- 1 What kind of body plan do annelids and arthropods have?
- 2 What is an earthworm’s body plan?
- 3 What type of body cavity do annelids have?
- 4 What is the body plan of platyhelminthes?
- 5 In what ways is the annelid digestive tract different from the digestive system of cnidarians and flatworms?
- 6 What are distinguishing characteristics of the nematode worms that are different from an annelid worm?
- 7 Does Annelida have a segmented body?
- 8 Do all annelids have segmented bodies?
What kind of body plan do annelids and arthropods have?
Both arthropods and annelids are segmented, and members of the annelid class Polychaeta have a pair of appendages on each segment. The plan of the nervous system in arthropods is very similar to that of annelids, and the basic plan in both groups shows a tubular, dorsal heart, which is then lost or modified in some.
What is an earthworm’s body plan?
The segmented body plan of an annelid worm with both circular and lengthwise muscles is the ideal structure for active burrowing. A one-way gut runs through the body, and they have both a circulatory system and nervous system.
What type of body cavity do annelids have?
Distinguishing features
| Annelida | Recently merged into Annelida | |
|---|---|---|
| Echiura | ||
| Body cavity | Coelom; but this is reduced or missing in many leeches and some small polychaetes | two coelomata, main and in proboscis |
| Circulatory system | Closed in most species | Open outflow, return via branched vein |
What body plan characteristics distinguish an annelid from other worms?
What characteristics distinguish an annelid from other worms? Annelids have segmented bodies and a coelem which is a tube filled with fluid and contains most of the organs.
How does an annelid worm move?
The basic features of locomotion in annelids are most easily observed in the earthworm because it lacks appendages and parapodia. Movement involves extending the body, anchoring it to a surface with setae, and contracting body muscles. A wave of contraction of longitudinal muscles follows, and the cycle is repeated.
What is the body plan of platyhelminthes?
The body plan of the flatworm is bilateral, with a head that leads—a plan that continues in most animals living today. The structure of this bilateral plan is ideal for an active hunter.
In what ways is the annelid digestive tract different from the digestive system of cnidarians and flatworms?
An annelid has a complete digestive tract with 2 openings that can process food and absorb nutrients as the meal moves from mouth to anus. A flatworm absorbs their nutrients through a muscular tube that projects through the mouth and sucks in food.
What are distinguishing characteristics of the nematode worms that are different from an annelid worm?
The key difference between nematodes and annelids is that nematodes are roundworms which are not segmented while annelids are true segmented worms. The presence and absence of a true coelom is another difference between nematodes and annelids. Nematodes possess a pseudocoelom while annelids possess a true coelom.
What is the Annelida body plan?
The annelid body plan is a tube within a tube. That is, there is an outer sheath of muscle, epidermis and cuticle, and an inner sheath of digestive tract suspended in the coelomic cavity.
What is the body plan for Annelida?
What is the Basic Body Plan of an Annelid? Long Body. As demonstrated by the earthworm body plan, annelids are long and lacking leg structures. Segmented Structures. Annelids are characterized by segments, which you can again see if you look at an earthworm. Hydrostatic Skeleton. The hydrostatic skeleton is composed of fluid-filled cavities called coelom, which exist in each somite. Body Systems.
Does Annelida have a segmented body?
Annelida A phylum of invertebrates comprising the segmented worms (e.g. the earthworm). Annelids have cylindrical soft bodies showing metameric segmentation, obvious externally as a series of rings separating the segments. Each segment is internally separated from the next by a membrane and bears stiff bristles (see chaeta).
Do all annelids have segmented bodies?
Annelida – Segmented Worms Annelids include earthworms, polychaete worms, and leeches. They all have segmented bodies. This means that their bodies are formed by many segments throughout their bodies. Each segment contains elements of a different bodily system such as nervous, circulatory, etc.