Npaj yog cephalized heev; lawv yog thawj tug tsiaj uas peb saib nyob rau hauv lub lab uas tiag tiag tig rov qab. Cephalization yog ib tug yam ntxwv ntawm tag nrho cov bilaterally symmetrical tsiaj. … Flatworms, nematodes thiab rotifers yog protostomes, thawj qhov qhib nyob rau hauv lub pob ntawm embryonic hlwb ua lub qhov ncauj.
Dab tsi Phylums muaj cephalization?
Cov tswv cuab ntawm Phylum Platyhelminthes (tshwj xeeb yog cov neeg npaj, Chav Turbellaria) muaj lub hlwb thiab lub siab lub cev nyob rau hauv pem hauv ntej ntawm tus tsiaj. Qhov no yog hu ua cephalization. Lub cev nqaij daim tawv yog thawj zaug ua rau kev sib cuag nrog ib puag ncig hauv cov tsiaj txhu cephalized.
Puas hnub qub hiav txwv cephalized?
Echinoderms, lossis hiav txwv hnub qub, kuj lack cephalization. Yuav luag tag nrho cov tsiaj tsis poob rau hauv ib qho ntawm cov pawg no nthuav tawm qee qhov kev cephalization.
Yuav tsiaj twg muaj cephalization?
Peb pawg tsiaj ua kom pom qhov siab ntawm cephalization: vertebrates, arthropods, thiab cephalopod mollusks. Piv txwv ntawm vertebrates muaj xws li tib neeg, nab, thiab noog. Piv txwv ntawm arthropods muaj xws li lobsters, ntsaum, thiab kab laug sab. Piv txwv ntawm cephalopods muaj xws li octopuses, squid, thiab cuttlefish.
Pob kab mob npaws muaj cephalization?
Sib piv thiab sib piv cov phiaj xwm lub cev ntawm flatworms nrog roundworms. Zoo sib xws: Ob leeg muaj peb txheej kab mob thiab ob sab symmetry. Lawv ob leeg muaj anterior thiab posterior xaus cia cephalization tshwm sim. … Covroundworm muaj lub cev kab noj hniav hu ua coelom.
