Medusa vs Polyp
Cnidarians yog ib pab pawg tseem ceeb hauv tsiaj lub nceeg vaj nrog ntau yam tshwj xeeb, thiab kev hloov pauv ntawm ntau tiam neeg ntawm cnidarians yog ib qho ntawm lawv cov yam ntxwv. Medusa thiab polyp yog ob lub cev ntawm cnidarians uas hloov mus rau ntau tiam neeg. Muaj ntau qhov sib txawv ntawm medusae thiab polyps hais txog cov duab, qhov loj me, thiab kev ua haujlwm. Yooj yim, kev ua neej nyob txawv ntawm medusa thiab polyp.
Medusa
Medusa yog ib hom ntawm lub cev daim ntawv pom nyob rau hauv cnidarians. Cov duab ntawm medusa yuav luag zoo li lub kaus nrog lub cev radially symmetrical, thiab sab sauv thiab sab ntawm lub cev hu ua Exumbrella thiab Subumbrella feem. Exumbrella muab lub medusa nws cov duab, thiab nws feem ntau yog convex thiab qee zaum puag ncig lossis qe zoo li hauv Portuguese Man-of-War. Sububrella yog me ntsis concave, thiab medusa muaj nws lub qhov ncauj nyob rau ntawd. Tsis tas li ntawd, lub subumbrella yog qhov chaw uas lawv cov tentacles txuas nrog. Tentacles muaj ntau hom nrog qee lub luag haujlwm rau kev yug me nyuam; ib co yog rau tuag tes tuag taw tsiaj, thiab lwm yam yog pab nyob rau hauv noj.
Jellyfish yog qhov piv txwv classic uas piav txog cov khoom ntawm medusa. Lub medusa yog lub sijhawm yug me nyuam ntawm lub neej ntawm chav kawm: Hydrozoa. Txawm li cas los xij, medusa yog ib daim ntawv ua luam dej dawb ntawm cnidarians thiab nws ua rau lub qhov ncauj thiab tentacles dandling txhua lub sijhawm. Lub cev phab ntsa yog tuab nrog lub xub ntiag ntawm mesoglea, ib yam khoom zoo li jelly, nruab nrab ntawm ib leeg-txheej txheej ectoderm thiab endoderm. Nws yog qhov nthuav kom pom tias muaj cov kab noj cua hu ua pneumatophore hauv medusae los pab lawv ntab hauv cov dej. Qee lub sij hawm lawv yog colonial, thiab cov colonial medusae muaj ib qho pneumatophore, tab sis muaj ib leeg, thiab.
Polyp
Polyp yog daim ntawv sessile ntawm cov cnidarians nrog ntau dua los yog tsawg dua lub cev cylindrical. Qhov piv txwv zoo tshaj plaws los piav txog hom no yuav yog coral polyp. Lawv lub cev cylindrically zoo li tus muaj elongated axis. Polyps tshwm sim nyob rau hauv cov zej zog los yog nyob ib leeg. Cov polyps tib leeg yog txuas rau hauv av los ntawm kev tuav lub npe hu ua pedal disc. Cov colonial polyps txuas rau ib leeg ncaj qha lossis tsis ncaj. Polyps muaj lawv lub qhov ncauj thiab cov tentacles nyob rau ntawm lub qhov ncauj kawg ntawm lawv lub cev, uas yog qhia upwards ib txwm. Cov Anthozoan cnidarians suav nrog corals thiab hiav txwv anemones yog ib txwm polyps, thiab lawv tsis hloov lawv tiam neeg. Lub asexual theem ntawm Hydrozoa thiab qee qhov ntawm Scyphozoa yog polyps. Lub mesoglea ntawm polyps tsis yog tuab heev, tab sis nws muaj nyob nruab nrab ntawm ib leeg-txheej cell-txheej txheem ectoderm thiab endoderm.
Polyp tau suav tias yog cov pob txha muaj sia vim nws muaj nyob hauv ib nrab lab xyoo dhau los yam tsis tau ploj mus los ntawm cov xwm txheej ploj mus. Polyps tuaj yeem tsim tawm los ntawm kev sib deev budding, thiab qhov ntawd qhia tias lawv muaj kev ywj pheej rau lwm tus los txhawb lawv lub neej.
Qhov txawv ntawm Medusa thiab Polyp yog dab tsi?
• Medusa yog lub caij ua luam dej dawb thaum polyp yog daim ntawv tsis sib xws.
• Medusae yog qhov tseem ceeb hauv Scyphozoans thaum polyps yog tib hom hauv Anthozoans.
• Medusa yog theem kev ua me nyuam thiab polyp yog theem asexual ntawm Hydrozoans.
• Medusa muaj nws lub qhov ncauj qhia downwards thaum polyp tau coj mus rau pem.
• Medusa muaj pneumatophore tab sis, tsis nyob hauv polyp.
• Polyp muaj lub cev yooj yim thiab feem ntau sib xws thaum cov duab sib txawv me ntsis ntawm medusae.
• Mesoglea yog tuab hauv medusa dua li hauv polyp.
• Tentacles yog qhov tseem ceeb hauv medusa dua li hauv polyp.
