Roundworms, tseem paub hauv biology li nematodes, yog ib pawg ntawm cov kab mob uas tau lees paub tias tsis muaj kev txav mus los. Cov kws tshawb fawb tau ntev ua pov thawj tias lawv yog thawj hom ntawm cov molting ntau yam. Nyob rau hauv lub nceeg vaj tsiaj, nematodes suav hais tias yog ib qho ntawm ntau pawg neeg.
Ntau hom
Ntau ntau yam nematodes nyob hauv av thiab dej. Lawv lub luag haujlwm tseem ceeb hauv kev ua haujlwm ntawm ecosystems paub. Muaj qhov sib xws thiab qhov sib txawv ntawm roundworms ntawm ntau hom, txhua tus muaj nws qhov chaw tshwj xeeb hauv qhov xwm txheej. Cov tseem ceeb muaj xws li: human roundworm, pinworm, human whipworm, hookhead, necator, plab hnyuv pob txuv, trichinella thiab guinea worm.
Zoo sib xws thiab sib txawv ntawm roundworms ntawm ntau hom
Nematodes zoo ib yam nyob rau hauv ob qho tib si sab hauv thiab sab nrauv:
- bilateral symmetry;
- tag nrho cov hom nematodes yog peb-txheej tsiaj;
- kab mob khaub thuas yog tsiaj ntau yam;
- lawv muaj lub cev tsis yog ntu;
- tag nrho cov nematodes txav mus rau tib txoj kev hauv qhov chaw;
- lub cev npog muaj cov leeg ntev, ib txheej txheej epithelium thiab tuab cuticle;
- kuj cab kuj muaj tib hom kev zom zaub mov, uas dhau los ntawm qhov quav.
Raws li koj tuaj yeem pom, muaj ntau qhov zoo sib xws ntawm ntau hom kab kab kab. Txawm hais tias nematodes muaj qhov sib txawv, lawv muaj tsawg:
- Qee yam tsiaj peb-txheej nyiam thaj chaw dawb;
- qee hom kab cua tsuas muaj nyob rau hauv lwm yam kab mob - lawv yog cab (ib qho piv txwv yuav yog roundworms).
Nws tsim nyog sau cia qhov zoo sib xws thiab qhov sib txawv ntawm cov kab kab sib txawv ntawm cov kab sib txawv thiab cov kab rov tav tiaj tus.
Lawv zoo sib xws:
- ob hom kab cab tuaj yeem ua kab mob hauv lub cev ntawm cov tsiaj;
- tsis yog kab mob sib kis tsis tau muaj kab mob ua pa thiab circulatory system;
- lawv tuaj yeem tsim tau ob lub qe thiab larvae;
- worms muaj ib qho epithelium, nyob rau saum npoo ntawm cov leeg nqaij fibers;
- lawv muaj ntau yam hauv cov qauv ntawm lub paj hlwb.
Cov kab mob no muaj ntau qhov sib xws tseem ceeb, qhov sib txawv ntawm cov kab mob sib txawv thiab nyias nyias nyias tsis muaj qhov tseem ceeb.
Qhov sib txawv:
- qhov sib txawv tseem ceeb ntawm ob hom no yog txoj kev ntawm kev yug me nyuam, vim hais tias roundworms yog poj niam txiv neej, thiab tiaj tus.tau muab cais ua hermaphrodites;
- kuj parasites muaj lub cev sib txawv;
- lawv muaj ntau hom kev zom;
- flatworms thiab nematodes muaj cov leeg nqaij sib txawv thiab ntau hom.
