Feem ntau cov hydrozoans muaj benthic, colonial polyp theem, uas rov tsim dua asexually los ntawm budding Ntau tus muaj dej dawb, kev sib deev medusae (saib Taw Qhia rau Ctenophores (thiab Cnidarian medusae)). Lwm tus tau txuas nrog gonophores, uas yuav tsim qe lossis phev.
Pob hydrozoans rov tsim kev sib deev?
The medusa yog theem kev sib deev hauv cov hydrozoans feem ntau. Lawv feem ntau tsim los ntawm budding los ntawm polyps, thiab feem ntau yog cov kab mob uas tsis muaj kev ua luam dej.
Hydroids yug li cas?
Colonies ntawm hydroids loj hlob vegetatively los ntawm kev nce tus naj npawb ntawm hydranths (lub cev tseem ceeb ntawm hydroid). Reproductive polyps (gonozooids) tshwm sim tsis tu ncua ntawm cov colony. Lawv tso medusae (feem ntau) los yog planula larvae (yog tias cov medusae khaws cia lossis txo), nyob ntawm hom.
Scyphozoa yuav ua li cas?
Tus scyphistoma reproduces asexually, tsim cov polyps zoo sib xws los ntawm budding, thiab tom qab ntawd hloov mus rau hauv medusa, los yog budding ob peb medusae tawm ntawm nws sab sauv ntawm tus txheej txheem hu ua strobilation.
Tus yam ntxwv ntawm Hydrozoa yog dab tsi?
Class Hydrozoa
- Qhov chaw sab hauv rau kev zom zaub mov yog kab noj hniav.
- Kab mob plab kab noj hniav muaj qhov qhib, qhov ncauj.
- Exoskeleton ntawm chitin.
- Yuav luag tag nrho marine thiab predators.
- Kev sib deev kev sib deev ua rau cov larvae planula.
- Ob lub cev, polyp thiab medusea.
- Kev muaj cov qog nqaij hlav hu ua Cnidocytes.
