Lub notochord ntawm cephalochordata, tsis zoo li lub vertebrate qaum, txuas mus rau hauv lub taub hau. Qhov no muab lub subphylum nws lub npe (cephalo- lub ntsiab lus "txog rau lub taub hau"). Lancelets yog cov hniav zoo li tus (tapered ntawm ob qho kawg), yielding lub npe amphioxus, uas los ntawm Greek rau "ob leeg (kawg) taw tes."
Vim li cas cephalochordates thiaj li muaj npe?
Known as lancelets lossis as amphioxus (los ntawm Greek rau "ob qho tib si [kawg] taw tes," hauv kev hais txog lawv cov duab), cephalochordates yog me me, zoo li eel, unprepossessing tsiaj uas siv ntau ntawm lawv lub sij hawm faus rau hauv xuab zeb.
Leej twg coined lo lus Cephalochordata?
Cephalochordata (se-fa-lo-kor-DA-ta) yog muab los ntawm ob lub hauv paus Greek uas txhais tau tias "lub taub hau qaum" [head -kephali (κεφαλή); thiab cord -chordi (χορδή)]. Qhov kev siv yog rau lub notochord txuas mus rau tus tsiaj lub taub hau. Lub npe tau coined los ntawm Owen (1846) thiab hauv cov tshuab feem ntau tuav cov qib ntawm subphylum hauv Chordata.
Vim li cas lancelets thiaj muab lub npe Branchiostoma?
Branchiostoma, ib qho invertebrate chorddate. Hauv chav kuaj no, koj yuav tshuaj xyuas ntau qhov sib txawv ntawm Branchiostoma, uas tseem hu ua Amphioxus. … Cov kab mob no kuj mus los ntawm lub npe "lancelet," supposedly vim nws zoo li ib tug me lance.
Qhov twg hauv qab no piav qhia txog cephalochordates?
Cephalochordates yog segmented marine tsiaj uas muaj elongated lub cev uas muaj ib tug notochord uas ncua lub cev ntev ntawm lub taub hau mus rau tus Tsov tus tw. Lawv tsuas yog ob peb centimeters ntev thiab vim lawv tsis muaj pob txha pob txha pob txha, lawv qhov muaj nyob hauv cov ntaub ntawv pob txha yog tsawg.
