Nyob zoo ib tsoom niam txiv kwv tij neej tsa sawv daws.
Ob leeg flatworms thiab roundworms yog qhov txaus ntshai heev thiab tsis txaus ntshai kab mob ntawm tib neeg thiab ntau lwm yam tsiaj hauv tsev. Nws yog ib qho kev to taub yuam kev ntawm tib neeg tias ob hom kab cab no yog cov tswv cuab ntawm tib pab pawg. Qhov tseeb, flatworms thiab roundworms yog sib txawv kiag li phyla hauv Kingdom: Animalia. Lawv ob leeg yog invertebrates thiab feem ntau parasitic tsiaj. Nws yuav tsim nyog los ntawm cov ntaub ntawv nthuav tawm hauv kab lus no, raws li nws qhia txog feem ntau ntawm cov yam ntxwv nthuav dav ntawm ob pawg thiab ua qhov sib piv ntawm ob.
Flatworms yog cov tswv cuab ntawm Phylum: Platyhelminthes thiab muaj ntau dua 20,000 hom sib sau ua ke. Lub koom haum tag nrho ntawm lawv lub cev tuaj yeem piav qhia nrog kev siv cov npe xws li unsegmented, bilaterally symmetrical, dorso-ventrally flattened, thiab soft-bodied. Flatworms yog tsim los ntawm tapeworms thiab flukes, uas feem ntau yog cov kab mob cab thiab ua rau muaj teeb meem loj hauv tsiaj nrog rau tib neeg. Tshwj xeeb, muaj plaub pawg ntawm cov kab mob flatworms (Turbellaria, Trematoda, Cestoda, thiab Monogenea) thiab tsuas yog ib pab pawg tsis yog parasitic. Flatworms tsis muaj lub cev kab noj hniav, thiab lawv tsis muaj lub cev tshwj xeeb; qhov tsis muaj circulatory thiab ua pa systems tuaj yeem hais ua piv txwv. Txawm li cas los xij, lawv lub cev dorso-ventrally flattened lub cev tso cai rau cov pa oxygen thiab lwm yam khoom noj khoom haus thauj mus rau hauv cov hlwb ntawm kev nthuav dav. Tag nrho cov concentration ntawm cov ntsiab lus nyob rau hauv ib tug flatworm lub cev kua nyob rau hauv ib tug tas li theem. Flatworms tsis muaj qhov quav, thiab lawv txoj hnyuv muaj tsuas yog ib qho qhib qhov twg ob qho tib si noj thiab tshem tawm. Lawv zom cov zaub mov tom qab noj thiab nqus cov ntsiab lus los ntawm ib txheej txheej endodermal ntawm plab mus rau hauv lub cev kua. Flatworms feem ntau nyiam nyob ib puag ncig ib puag ncig ntub lossis hauv lwm yam tsiaj lub cev ua kab mob.
Nyob zoo ib tsoom niam txiv kwv tij neej tsas sawv daws.
Nematodes, cov tswv cuab ntawm Phylum: Nematoda, kuj hu ua Round worms. Muaj txog ib lab hom nematode raws li qee qhov kev kwv yees, thiab twb muaj 28,000 tau piav qhia. Feem ntau ntawm cov Nematodes (16, 000 hom) yog cov kab mob cab, thiab qhov no yog vim li cas rau qhov tsis zoo ntawm cov kab mob sib kis. Cov tswv cuab loj tshaj plaws ntawm phylum yog txog tsib centimeters ntev, tab sis qhov nruab nrab ntev yog li 2.5 millimeters. Cov hom me tshaj plaws tsis tuaj yeem pom tshwj tsis yog tias muaj kev pab ntawm lub tshuab tsom. Nematodes muaj cov txheej txheem digestive nrog lub qhov ncauj ntawm ib qho kawg ntawm lub cev thaum lub qhov quav nyob rau ntawm qhov kawg. Lub qhov ncauj yog nruab nrog peb daim di ncauj, tab sis qee zaum tus naj npawb ntawm daim di ncauj tuaj yeem yog rau, thiab. Lawv tsis yog segmented worms, tab sis anterior thiab posterior kawg yog tapered los yog nqaim. Txawm li cas los xij, muaj ob peb ornaments viz. warts, bristles, rings, thiab lwm yam khoom me me. Lub cev kab noj hniav ntawm Nematodes yog pseudo coelom, uas yog lined nrog mesodermal thiab endodermal cell txheej. Lub cephalisation lossis tsim lub taub hau kom txawv ntawm lwm lub cev tsis yog qhov tseem ceeb ntawm Nematodes, tab sis lawv muaj lub taub hau nrog cov paj hlwb. Cov kab mob parasitic tshwj xeeb tau tsim qee cov paj hlwb kom paub qhov chaw uas lawv nyob.
Dab tsi yog qhov txawv ntawm Flatworm thiab Roundworm?
• Flatworms yog dorso-ventrally flattened thaum roundworms ntau dua cylindrical nyob rau hauv cov duab thiab yog tapered ntawm ob kawg.
• Cov kab mob Roundworms muaj txheej txheej txheej hu ua cuticle. Feem ntau, flatworm muaj cilia nyob rau saum npoo ntawm nws lub cev thiab tsis cuticle.
• Flatworms yog acoelomates uas lawv tsis muaj lub cev kab noj hniav, whereas roundworms yog psuedocoelomates.
• Flatworms tsuas muaj qhov qhib xwb, uas ua haujlwm raws li ob lub qhov ncauj thiab qhov quav. Txawm li cas los xij, roundworms muaj ib qho kev zom zaub mov, nrog ob qhov qhib rau lub qhov ncauj thiab qhov quav.
• Ntau haiv neeg muaj ntau dua ntawm cov kab kab sib luag piv rau cov kab mob flatworms.
• Flatworms feem ntau loj dua piv rau roundworms hauv lawv lub cev loj.
