seta has cells that function as cell follicles located at the
exterior of the body. Seta can be lengthened and shortened. Seta functions such
as muscle protractors and retractors. Seta usually used for grasping and
holding the substrate. The main function seta as body locomotion.
The species of the order olighochaeta have seta in various forms, is shaped like a needle and hair. Variation form seta seta body is affected by the location of the earthworm. Usually the genus Lumbricus seta sigmoid shape, and has a length of about 1 mm. Seta on genital organs (klitelum) can reach 7 mm.
Physiologically seta help copulation, receive physical stimulus partner. Seta also help earthworms when copulation by grasping, holding, and penetrate the skin.
Seta arranged in a single ring encircling its body segments. Based on the number and distribution, form seta divided into two lumbricine and perichaetine.
Lumbricine
Seta Lumbricine have amounted to 8 per segment, seta is on the ventral and latero ventral.
Based on the distance, seta lumbricine divided into 3 antaralain:
a. Closely paired, b. Widely paired, and c. distant.
The species of the order olighochaeta have seta in various forms, is shaped like a needle and hair. Variation form seta seta body is affected by the location of the earthworm. Usually the genus Lumbricus seta sigmoid shape, and has a length of about 1 mm. Seta on genital organs (klitelum) can reach 7 mm.
Physiologically seta help copulation, receive physical stimulus partner. Seta also help earthworms when copulation by grasping, holding, and penetrate the skin.
Seta arranged in a single ring encircling its body segments. Based on the number and distribution, form seta divided into two lumbricine and perichaetine.
Lumbricine
Seta Lumbricine have amounted to 8 per segment, seta is on the ventral and latero ventral.
Based on the distance, seta lumbricine divided into 3 antaralain:
a. Closely paired, b. Widely paired, and c. distant.
The distance between each pair of the two pairs seta seta
and constant each species.
Seta symbolized by the letters a, b, c, and d. The distance between the seta is important to note in identifying the systemic character of earthworms, and usually exemplified in the form of multiplication.
Examples:
seta ratio in the area klitelum Lumbricus terrestris
aa: ab: bc: cd: ss = 16: 4: 14: 3: 64, the distance is exemplified in the form of multiplication aa = 4 ab or ab <bc> cd.
The distance between the two dorsal seta on the other hand is always compared with the circumference of the body of earthworm (μ) was dd = ½ μ
Perichaetine
Seta Perichaetine characterized arranged in a ring that rotates in the right segment, usually varying in size from large and small. Seta is in the area of mid-dorsal and ventral mid. Seta amounted to 8 pairs per segment, usually the amount of 50-100 pairs / segments.
Seta perichaetine arrangement found in many species, especially Megascolecidae Megascolex, Perionyx, and Pheretima.
Seta deployment there is a middle of lumbricine and Perichaetine, structure 12, 16, 20, or 24 seta / segment or 6, 8, 10, or 12 pairs seta / segments, with the arrangement lumbrisine anteriorly and posteriorly perichaetine.
Seta symbolized by the letters a, b, c, and d. The distance between the seta is important to note in identifying the systemic character of earthworms, and usually exemplified in the form of multiplication.
Examples:
seta ratio in the area klitelum Lumbricus terrestris
aa: ab: bc: cd: ss = 16: 4: 14: 3: 64, the distance is exemplified in the form of multiplication aa = 4 ab or ab <bc> cd.
The distance between the two dorsal seta on the other hand is always compared with the circumference of the body of earthworm (μ) was dd = ½ μ
Perichaetine
Seta Perichaetine characterized arranged in a ring that rotates in the right segment, usually varying in size from large and small. Seta is in the area of mid-dorsal and ventral mid. Seta amounted to 8 pairs per segment, usually the amount of 50-100 pairs / segments.
Seta perichaetine arrangement found in many species, especially Megascolecidae Megascolex, Perionyx, and Pheretima.
Seta deployment there is a middle of lumbricine and Perichaetine, structure 12, 16, 20, or 24 seta / segment or 6, 8, 10, or 12 pairs seta / segments, with the arrangement lumbrisine anteriorly and posteriorly perichaetine.
-Part Body parts Earthworm
1. Seta
Earthworms have a helper tool that is seta. Seta is anchored more firmly in place so that the worms move.
Examples:
When an earthworm withdrawn from the hole, his body will not break. This is due to the strong adhesion seta.
2. klitelum
In the anterior body earthworms are klitelum. Klitelum useful in mating and breeding.
3. prostomium
At the end of the anterior or front part of the body earthworms are equipped mouth lip-like tool called prostomium.
Prostomium looks weak, but in fact is very powerful because it can be used to penetrate the soil.
Earthworms body consists of segments and has a simple structure of organs, which makes earthworms can adapt well to the environment. Earthworms do not have tools such as foot and hand motion. However, the worm has muscles on his body. Elongated body muscles and muscles of the body are circular and thick, can help the movement. If observed this animal looks very weak, but not so "these animals are relatively strong, due to the arrangement of the circular and longitudinal muscle was worms can penetrate the soil".
The worms can push an object or a small stone that weighs 60 times more weight than his own body. "We can imagine how powerful, if a man weighing 50 kg can push an object that weighs 50 kg x 60 = 3000 kg / 3 ton". When the worm penetrates the soil, the land portion will be pushed to the side. If the land can not be driven, the soil will eat and be sprayed out through the mouth or issued together feces through the anus.
Earthworms eat organic material from plant litter / litter. In the small intestine, the waste is broken down into materials useful to the body. The rest is issued in the form of dirt / castings. Casting is rich in nutrients that are needed by plants. This event can be called a mini composting plant.
Earthworm body surface is always slippery. Slippery worm body due to the presence of mucus. Mucus is produced by mucous glands contained in the epidermal layer of the skin. Mucus is produced to coat the entire surface of the body of the worm. With the mucus, the worm can be easily moved in rugged places (eg: in the leaves, twigs, plants fall). In addition mucus is also used to memperlicin channel or hole in the ground, in order to more freely moving worms.
Earthworms do not have a special organ to defend themselves from enemy attack. With earthworm mucus becomes very slippery, so that his enemies are difficult to catch. Indirectly, the mucus can be used as a tool to defend themselves against predators
1. Seta
Earthworms have a helper tool that is seta. Seta is anchored more firmly in place so that the worms move.
Examples:
When an earthworm withdrawn from the hole, his body will not break. This is due to the strong adhesion seta.
2. klitelum
In the anterior body earthworms are klitelum. Klitelum useful in mating and breeding.
3. prostomium
At the end of the anterior or front part of the body earthworms are equipped mouth lip-like tool called prostomium.
Prostomium looks weak, but in fact is very powerful because it can be used to penetrate the soil.
Earthworms body consists of segments and has a simple structure of organs, which makes earthworms can adapt well to the environment. Earthworms do not have tools such as foot and hand motion. However, the worm has muscles on his body. Elongated body muscles and muscles of the body are circular and thick, can help the movement. If observed this animal looks very weak, but not so "these animals are relatively strong, due to the arrangement of the circular and longitudinal muscle was worms can penetrate the soil".
The worms can push an object or a small stone that weighs 60 times more weight than his own body. "We can imagine how powerful, if a man weighing 50 kg can push an object that weighs 50 kg x 60 = 3000 kg / 3 ton". When the worm penetrates the soil, the land portion will be pushed to the side. If the land can not be driven, the soil will eat and be sprayed out through the mouth or issued together feces through the anus.
Earthworms eat organic material from plant litter / litter. In the small intestine, the waste is broken down into materials useful to the body. The rest is issued in the form of dirt / castings. Casting is rich in nutrients that are needed by plants. This event can be called a mini composting plant.
Earthworm body surface is always slippery. Slippery worm body due to the presence of mucus. Mucus is produced by mucous glands contained in the epidermal layer of the skin. Mucus is produced to coat the entire surface of the body of the worm. With the mucus, the worm can be easily moved in rugged places (eg: in the leaves, twigs, plants fall). In addition mucus is also used to memperlicin channel or hole in the ground, in order to more freely moving worms.
Earthworms do not have a special organ to defend themselves from enemy attack. With earthworm mucus becomes very slippery, so that his enemies are difficult to catch. Indirectly, the mucus can be used as a tool to defend themselves against predators
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