Lub Hydrozoa yog ib pawg ntawm cnidarians uas muaj kwv yees li 3700 hom. … Feem ntau cov hydrozoans yog marine, thiab hydrozoan hom muaj nyob hauv yuav luag txhua hom chaw nyob hauv hiav txwv; ob peb hom nyob hauv dej tshiab. Feem ntau cov hydrozoans tsim cov cheeb tsam ntawm asexual polyps thiab pub dawb-ua luam dej medusae.
Lub ntsiab lus ntawm Hydrozoa yog dab tsi?
: ib yam ntawm ib chav kawm (Hydrozoa) ntawm cnidarians (xws li hydra, hluav taws kub hnyiab, thiab Portuguese txiv neej-ntawm-ua tsov ua rog) uas suav nrog ib leeg thiab colonial polyps thiab medusae tab sis feem ntau muaj cov theem medusa txo qis los yog tsis tuaj thiab tsis muaj nematocysts hauv plab hnyuv - saib siphonophore.
Dab tsi tsiaj muaj rau Hydrozoa?
Qee yam piv txwv ntawm hydrozoans yog freshwater jelly (Craspedacusta sowerbyi), dej tshiab polyps (Hydra), Obelia, Portuguese txiv neej o' tsov rog (Physalia physalis), chondrophores (Porpitidae), "air fern" (Sertularia argentea), thiab paj yeeb-hearted hydroids (Tubularia).
Lub neej voj voog ntawm Hydrozoa yog dab tsi?
Nyob hauv ntau hom hydrozoan, lub voj voog lub neej muaj ib qho dawb-living planula larva uas hloov mus rau hauv thawj polyp. Thawj polyp buds lwm polyps los tsim ib tug benthic colonial theem. Thaum kev loj hlob zuj zus, cov polyps bud pelagic medusae uas thaum kawg tsim gametes thiab spawn nyob rau hauv dej kem.
hydrozoa pom nyob qhov twg?
Feem ntau hydrozoans yog marine, thiab hydrozoan hom pomnyob rau hauv ze li txhua hom chaw nyob marine; ob peb hom nyob hauv dej tshiab. Feem ntau cov hydrozoans tsim cov cheeb tsam ntawm asexual polyps thiab kev sib deev medusae dawb. Colonies feem ntau yog benthic, tab sis qee qhov, tshwj xeeb tshaj yog cov siphonophores, yog pelagic floaters.
