Placoid nplai tau pom hauv sharks thiab rays, thiab tuaj yeem sib txawv heev ntawm sab nraud. Tsis zoo li cov nplai ntawm cov ntses pob txha, cov nplai placoid tsis nce qhov loj me thaum cov ntses loj tuaj, hloov cov nplai tshiab ntxiv ntawm cov nplai laus.
Placoid nplai yog dab tsi?
Placoid scales (los yog denticles) yog spiny, toothlike projections pom tsuas yog nyob rau hauv cartilaginous ntses. Ganoid nplai, qee zaum suav tias yog kev hloov kho ntawm hom placoid, yog cov pob txha tseem ceeb tab sis tau them nrog cov khoom zoo li enamel hu ua ganoin.
Placoid nplai hauv zoology yog dab tsi?
placoid scale (dermal centicle) Ib hom nplai uas suav nrog chav hauv paus ntawm tawv tawv npog ntawm sharks. … Tsis zoo li cov nplai ntawm cov ntses pob txha, cov nplai placoid tsis loj hlob tom qab lawv ncav cuag qhov loj me thiab cov nplai tshiab tau ntxiv thaum tus tsiaj loj tuaj.
Placoid nplai loj npaum li cas?
placoid nplai ntawm sharks thiab rays yog qhia hauv daim duab 5a. Cov nplai no feem ntau yog me me (c. 100-200 lm ntev) thiab zaum saum cov pedestals uas loj hlob los ntawm anchors ntawm daim tawv nqaij (Motta li al.
Placoid nplai zoo li cas?
Placoid nplai yog cov nplai me me, tawv tawv uas npog daim tawv nqaij ntawm elasmobranches, lossis cov ntses cartilaginous - qhov no suav nrog sharks, rays, thiab lwm yam skates. Thaum cov nplais placoid zoo ib yam li qee txoj hauv kev rau cov nplai ntawm cov ntses pob txha, lawv zoo li cov hniav uas npog nrog tawv tawv.
