Platyhelminthes vs Nematoda
Platyhelminthes thiab Nematoda yog ob qho loj invertebrate phyla hauv Kingdom Animalia uas qhia qee qhov sib txawv ntawm lawv nyob rau hauv cov nqe lus ntawm lawv morphology. Invertebrates yog cov tsiaj uas tsis muaj pob txha. Lwm qhov loj invertebrate phyla suav nrog Porifera, Cnidaria, Annelida, Arthropoda, Mollusca, thiab Echinodermata. Platyhelminthes thiab nematodes yog non-coelomates thiab muaj lub cev yooj yim heev. Txawm hais tias lawv yooj yim, cov tsiaj no ua txhua yam tseem ceeb hauv lub cev ua haujlwm ntawm lub neej (ua pa, noj zaub mov, kev yug me nyuam, kev tiv thaiv, thiab lwm yam) ib yam li lwm yam tsiaj txhu. Lub ntsiab tseem ceeb ntawm tsab xov xwm no yog qhov sib txawv ntawm Platyhelminthes thiab Nematoda; Txawm li cas los xij, morphology ntawm tus kheej cov kab mob; uas yog lub morphology ntawm Platyhelminthes thiab cov Nematoda kuj tseem yuav tau qhia ntawm no.
Platyhelminthes yog dab tsi?
Platyhelminthes lossis flatworms yog unsegmented, ob sab sib luag symmetrical acoelomates. Lawv muaj ciliated, mos, dorsoventrally flattened worm-zoo li lub cev nrog lub plab tsis tiav. Txog 20,000 hom Platyhelminthes paub txog hnub no. Flatworms yog hermaphroditic thiab lawv kev yug me nyuam yog kev sib deev. Txawm li cas los xij, asexual regeneration kuj muaj nyob rau hauv pawg no. Cov kab uas muaj sia nyob dawb muaj nyob hauv cov dej hiav txwv, cov chaw hauv av thiab cov dej tsis huv, thiab lawv noj cov tsiaj me thiab cov khib nyiab organic. Lawv muaj ciliated epithelial hlwb thiab cov leeg, uas pab nyob rau hauv locomotion. Dawb nyob worms muaj ib tug zoo network ntawm tubules nrog nplaim hlwb uas ua raws li lawv excretory system. Feem ntau ntawm Platyhelminthes pom nyob rau hauv lwm yam tsiaj lub cev raws li parasites.
Phylum Platyhelmineths muaj peb chav kawm, uas yog; Turbellaria, Trematoda, thiab Cercomeromorpha. Turballarian suav nrog tag nrho cov tsiaj nyob dawb (xws li: Dugesia). Trematoda thiab Cercomeromorpha suav nrog tag nrho cov kab mob parasitic flatworms. Trematoda muaj ntau dua 10,000 hom kab mob uas paub (xws li: Mob plab, ntshav fluke), thiab Cercomeromorpha suav nrog cov kab mob (xws li: Taenia saginata). Parasitic flatworms tuaj yeem ua rau mob rau tib neeg. Yog li lawv tseem ceeb rau kev kho mob thiab kws kho tsiaj.
Nematoda yog dab tsi?
Nematodes lossis roundworms yog pseudocoelomates thiab tsis muaj segmented ob sab symmetrical lub cev. Cov kws tshawb fawb ntseeg tias muaj ntau dua 25,000 hom nematodes nyob hauv ntiaj teb. Nematodes muaj ntau pom nyob rau hauv cov av, dej hiav txwv, thiab cov dej tshiab thiab ntau nyob hauv cov tsiaj thiab cov nroj tsuag lub cev ua kab mob. Feem ntau ntawm cov hom yog microscopic. Lawv lub cev zoo li cab yog yoog raws thiab npog los ntawm cov cuticle tuab uas yog molted thaum lawv loj hlob. Lawv lub cev yooj yim tsis muaj cov kab mob ua pa tshwj xeeb thiab kev sib pauv ntawm gasses tshwm sim tsuas yog cov cuticle. Lawv tsis muaj cov leeg ncig lub cev thiab tsuas muaj cov leeg ntev. Ib tug zoo-tsim tiav digestive system yog tam sim no nyob rau hauv nematodes. Nematodes yug me nyuam kev sib deev. Feem ntau ntawm lawv yog gonochoric thiab qhia kev sib deev dimorphism. Hookworm, trichinosis, pinworm, plab hnyuv roundworm, thiab filariasis yog ib co tseem ceeb, kab mob ua rau, parasitic roundworms.
Dab tsi yog qhov sib piv ntawm Platyhelminthes thiab Nematoda?
• Nematodes hu ua roundworms thaum Platyhelminthes hu ua flatworms.
• Nematodes yog pseudocoelomates, thaum Platyhelminthes yog acoelomates.
• Hom nematodes siab dua Platyhelminthes.
• Platyhelminthes muaj lub plab tsis tiav whereas nematodes muaj ib qho tiav.
• Tsis zoo li cov nematodes, Platyhelminthes muaj cov nplaim hluav taws los ua cov haujlwm excretory.
• Lub cev ntev ntawm flatworms yuav txawv ntawm 1 hli los yog tsawg dua mus rau ntau meters. Tsis zoo li flatworms, feem ntau roundworms yog microscopic.
• Platyhelminthes yog hermaphroditic thiab nematodes yog gonochoric.
