what are the characteristic features of phylum Platyhelminthes
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Biology Ph-Po Platyhelminthes - Biology Encyclopedia
Platyhelminthes
The phylum name Platyhelminthes literally means "flatworms." Members of this phylum are soft, thin-bodied, leaf or ribbonlike worms, including the familiar planaria of ponds and streams, as well as the flukes and tapeworms parasitic in human and other animal bodies. Some defining characteristics of the phylum are that flatworms are acoelomate (they have no body cavity), triploblastic (the body has three tissue layers), and bilaterally symmetric (they have symmetric right and left sides and usually a definite head), and they have organ systems, including an excretory, digestive, reproductive, and nervous system, but no respiratory system.
Their body is dorsoventrally flattened.
They exhibit bilateral symmetry.
Also, they are triploblastic, with three germ layers.
They do not have a body cavity and are acoelomate.
Body is soft and unsegmented.
They are mostly parasitic with a few free-living
They exhibit an organ system grade of organization.
The digestive system is incomplete or absent. There is a single opening which leads to a well-developed gastro-vascular cavity. The anus is absent. There is no true stomach structure. In a few species, the digestive system is completely absent.
Respiratory and circulatory systems are absent. Respiration generally occurs through diffusion through the general body surface.
The excretory system has protonephridia with the flame
There is primitive nervous system present.
These animals are hermaphrodites.
Sexual reproduction happens through gametic fusion.
Asexual reproduction also happens in a few species through regeneration and fission.
Fertilization is internal.
The life cycle of these organisms can be complex, especially if they are parasitic, as this may involve one or more host animals.
Biology Ph-Po Platyhelminthes - Biology Encyclopedia
Platyhelminthes
The phylum name Platyhelminthes literally means "flatworms." Members of this phylum are soft, thin-bodied, leaf or ribbonlike worms, including the familiar planaria of ponds and streams, as well as the flukes and tapeworms parasitic in human and other animal bodies. Some defining characteristics of the phylum are that flatworms are acoelomate (they have no body cavity), triploblastic (the body has three tissue layers), and bilaterally symmetric (they have symmetric right and left sides and usually a definite head), and they have organ systems, including an excretory, digestive, reproductive, and nervous system, but no respiratory system.
Their body is dorsoventrally flattened.
They exhibit bilateral symmetry.
Also, they are triploblastic, with three germ layers.
They do not have a body cavity and are acoelomate.
Body is soft and unsegmented.
They are mostly parasitic with a few free-living
They exhibit an organ system grade of organization.
The digestive system is incomplete or absent. There is a single opening which leads to a well-developed gastro-vascular cavity. The anus is absent. There is no true stomach structure. In a few species, the digestive system is completely absent.
Respiratory and circulatory systems are absent. Respiration generally occurs through diffusion through the general body surface.
The excretory system has protonephridia with the flame
There is primitive nervous system present.
These animals are hermaphrodites.
Sexual reproduction happens through gametic fusion.
Asexual reproduction also happens in a few species through regeneration and fission.
Fertilization is internal.
The life cycle of these organisms can be complex, especially if they are parasitic, as this may involve one or more host animals.
Answered by
3
1) triploblastic
2) Acoelomate
3) parasitic
4)single opening
5)body is soft elongated
6)they are bilateral symmetry
2) Acoelomate
3) parasitic
4)single opening
5)body is soft elongated
6)they are bilateral symmetry
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