Chondrichthyans muaj cov nplai zoo li cov hniav hu ua dermal denticles lossis placoid scales. Denticles feem ntau muab kev tiv thaiv, thiab feem ntau, streamlining. Cov qog mucous muaj nyob hauv qee hom, thiab.
Dab tsi yog hloov kho rau hauv cov hniav hauv Chondrichthyes?
Chondrichthyans muaj cov nplai zoo li cov hniav hu ua dermal denticles lossis placoid nplai. … Nws twb tau hais tias thawj daim phiaj pob txha ntawm tag nrho cov vertebrates tam sim no ploj mus thiab hais tias cov nplais tam sim no tsuas yog hloov cov hniav, txawm tias ob qho tib si cov hniav thiab lub cev armor muaj keeb kwm ib txwm muaj. ntev dhau los.
Do Chondrichthyes puas muaj hniav?
Cov tswv cuab ntawm Chondrichthyes txhua tus tsis muaj pob txha tiag tiag thiab muaj lub cev pob txha ua pob txha (cov khoom siv tau yooj yim koj tuaj yeem hnov hauv koj lub qhov ntswg thiab pob ntseg). Tsuas yog lawv cov hniav, thiab qee zaum lawv vertebrae, raug calcified; Cov pob txha calcified no muaj cov qauv sib txawv ntawm cov pob txha tiag.
Puas Chondrichthyes muaj lub puab tsaig?
Gnathostomes, lossis "lub puab tsaig-lub qhov ncauj," yogvertebrates uas muaj lub puab tsaig tiag tiag -ib qho tseem ceeb hauv kev hloov pauv ntawm cov vertebrates. … Cov ntses niaj hnub no feem ntau yog gnathostomes uas yog cov clades Chondrichthyes thiab Osteichthyes (uas suav nrog chav kawm Actinoptertygii thiab chav Sarcopterygii).
Tus yam ntxwv ntawm Chondrichthyes yog dab tsi?
Txiv kab mob hauv chav kawm no muaj paired fins, tawv nplais, ob lub siab chambered, thiab ob lub qhov ntswg. Feem ntau hom muaj 5-7 gill slits rautxhua sab ntawm lawv lub cev. Qee hom tsim qe, lwm tus yug me nyuam.
