Animalscaretips
- Are Platyhelminthes sessile?
- How do sponges and cnidarians differ from flatworms and roundworms?
- How do flatworms and roundworms differ from annelids?
- Are roundworms and flatworms the same?
- Do roundworms have Cephalization?
- Are roundworms segmented?
- How are worms similar to cnidarians?
- Can roundworms reproduce asexually?
- Do nematoda have true tissues?
- Do flat and round worms belong to the same phylum?
- Are earthworms roundworms?
- How do roundworms differ from segmented worms?
- How do you classify worms?
- How do you identify worms?
- Do roundworms have an endoskeleton or exoskeleton?
- Do roundworms have three tissue layers?
- Are nematodes bilateral or radial?
Are Platyhelminthes sessile?
Why does a sessile animal need a motile larval stage? Phylum Platyhelminthes - flatworms, flukes and tapeworms; 18,500 sp. ... Because they are so flat, diffusion is sufficient for respiration, and flatworms lack respiratory and circulatory systems.
How do sponges and cnidarians differ from flatworms and roundworms?
Porifera (sponges) have specialized cells and an endoskeleton but lack true tissues and body symmetry. ... Platyhelminthes (flatworms) have a mesoderm cell layer, simple organ systems, cephalization, and bilateral symmetry. Nematoda (roundworms) have a pseudocoelom and hydrostatic skeleton.
How do flatworms and roundworms differ from annelids?
Annelids differ from flatworms and roundworms by how they digest their food. 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.
Are roundworms and flatworms the same?
A flatworm has a thin, dorsoventrally flattened body. Roundworms are more cylindrical in shape and tapered to a fine point at one end. ... Flatworms generally live in bodies of water, while roundworm species can live either on water or in soil.
Do roundworms have Cephalization?
Compare and contrast the body plans of flatworms with roundworms. Similarities: Both have three germ layers and bilateral symmetry. They both have anterior and posterior ends allowing cephalization to occur. ... A roundworm has fluids that circulate through the body; a flatworm does not.
Are roundworms segmented?
Roundworms, which have a body cavity but no segments. Segmented worms, which have both a body cavity and segmented bodies.
How are worms similar to cnidarians?
They all have long, narrow bodies without legs. All worms also have tissues, organs, and organ systems. Worms have bilateral symmetry. Unlike sponges or cnidarians, worms have distinct head and tail ends.
Can roundworms reproduce asexually?
Roundworm Reproduction
Roundworms reproduce sexually. Sperm and eggs are produced by separate male and female adults. Fertilization takes place inside the female organism.
Do nematoda have true tissues?
Although nematodes do have a space in the body between the digestive tract and the body wall, it is not lined with tissue and is not considered to be a true coelom. ... Unlike other worms that have two bands of muscles, nematodes only have longitudinal muscles.
Do flat and round worms belong to the same phylum?
Flatworms and roundworms are two types of worms with many differences in their body. Flatworms belong to the phylum Platyhelminthes while roundworms belong to the phylum Nematoda.
Are earthworms roundworms?
Invertebrate animals commonly called "worms" include annelids (earthworms and marine polychaete or bristle worms), nematodes (roundworms), platyhelminthes (flatworms), marine nemertean worms ("bootlace worms"), marine Chaetognatha (arrow worms), priapulid worms, and insect larvae such as grubs and maggots.
How do roundworms differ from segmented worms?
One of the most prominent differences between roundworms and segmented worms is their circulatory systems. Segmented worms have a complete circulatory system, while round worms do not. ... Roundworms have no hearts or blood vessels. Roundworms use diffusion to breathe and pass nutrients throughout their bodies.
How do you classify worms?
Yes, worms are animals. Worms are divided into three groups: the flatworm, the roundworm, and the segmented worm. Flatworms are soft, unsegmented invertebrates.
How do you identify worms?
When determining the colour of an earthworm, make sure that you are looking at the dorsal side (back side) of the earthworm. (The ventral side of most earthworms is colourless, and thus cannot be used in identification.) Pay particular attention to the colour between the head and the clitellum.
Do roundworms have an endoskeleton or exoskeleton?
Do roundworms have an endoskeleton or exoskeleton? The nematode body is encased in a cuticle, a flexible but tough exoskeleton, or external skeleton, which offers protection and support. The cuticle contains a carbohydrate-protein polymer called chitin.
Do roundworms have three tissue layers?
Nematodes have three germ layers, a body cavity between the mesoderm and endoderm (pseudocoelom), a well developed nervous system, are not segmented, and must molt to grow.
Are nematodes bilateral or radial?
Nematodes are tiny roundworms that may be parasitic. Nematodes have bilateral symmetry, which means there is a line lengthwise that can divide them into two equal halves that are mirror images. The heads of nematodes have radial symmetry which means that any line drawn through the center produces mirror images.
