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7. Excretory system metanephridial variety.
8. Brain easy type with ventral nerve cords.
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9. They are hermaphrodites. 10.
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Fertilization (cross-fertilization) occurs externally. 11. Development immediate and usually takes position in just cocoon secreted by the clitellum. 12. Asexual reproduction usually common in freshwater species and involves by the transverse division of the adult system.
13. No larval phase in the everyday living cycle.
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Most species are found in freshwater or terrestrial habitats, a few species are maritime. It consists of three orders:Order one.
Lumbriculida:rn(i) 4 pairs setae in every phase. rn(ii) Clitellum is made up of a single celled layer. rn(iii) Male and feminine gonopores in the clitellum. rn(iv) Male pores anterior to woman pores. rn(v) Inhabitants of freshwater.
Lumbriculus, Rhynchelmis, Styloscolex. Order two. Tubificida:rn(i) Setae current in bundles with two or far more setae. rn(ii) Clitellum is made up of a one-celled layer. rn(iii) Male and woman gonopores in the clitellum.
rn(iv) Male gonopore in front of the feminine gonopore. rn(v) Just one pair of testes followed by a pair of ovaries. rn(vi) Primarily aquatic. Tubifex, Branchiura, Nais, Dero, Chaetogaster. Order three. Haplotaxida:rn(i) Setae easy or forked, and may possibly be 4 or eight or from time to time multiplied in a ring in each individual segment.
rn(ii) Clitellum composed of two or extra levels of cells. rn(iii) Female gonopores constantly on the 14th section and male gonopore a couple of segments behind them.
rn(iv) One pair of testes or ovaries or each normally absent. rn(v) Aquatic or semi-terrestrial. Alluroides, Drawidia, Lumbri- cus, Megascolides, Megascolex, Pheretima, Eudrilus. Class three. Hirudinea (L Hirudo = a leech):1. Human body is composed of definite and limited selection of segments. 2. Trunk consists of 21 segments with preclitellar area, clitellum and article clitellar area. 3. Clitellum incorporates 3 segments and under no circumstances conspicuous https://www.reddit.com/r/PaperHub/comments/x9r6o1/paper_help/ other than reproductive time period. 4. Segments are marked externally by secondary rings or annuli. 5. Ordinarily with a little suctorial anterior sucker and a massive effective posterior sucker. 6. Parapodia and head appendages absent. 7. Coelom typically reduced by the existence of connective tissue, termed botryoidal tissue, and muscle tissue. 8. Both of those sinuses and muscular blood vessels current. 9. Excretory organs involve segmentally organized ten to seventeen pairs of metanephria. 10. Asexual reproduction absent. 12. Gonads and gonoducts restricted to anterior several segments. 13. Fertilization interior. 14. Advancement direct and will take position in cocoons secreted by clitellum. Habit and Habitat:They are either cost-free residing or forever or intermittently ectoparasites. In freshwater big quantity of species prey on invertebrates rather than blood sucking species but most marine species are ectoparasites on fishes. Due to similarities in numerous details involving Polychaeta and Hirudinea, this sort of as:rn(i) Absence of parapodia and sensory cephalic appendages,rn(ii) Existence of clitellum,rn(iii) Both equally teams are hermaphrodites and. rn(iv) Development inside cocoons, several authors propose that they have evolved from a common ancestor and to be mono- phyletic.
