Izimpethu Polychaete: incazelo emfushane isigaba

izimpethu Polychaete njengamanje kubhekwe iqembu elikhulu eziphilayo zasolwandle. Laba bameleli be-evamile ekilasini bukhoma at phansi kolwandle emanzini, futhi cishe ingasaphathwa ukuhola ngendlela planktonic zokuphila.

izimpethu Polychaete: body building

Omele walo mzimba ekilasini siqukethe inhloko yomnyango, umzimba eside futhi Lobe ethize bendunu. Ezimweni eziningi, umzimba Isilwane ngokucacile ihlukaniswe izingxenye eziningana, ngayinye ehambisana parapodium.

Parapodia amelela lutho okunye ukwedlula emkhawulweni bakudala nge amadevu amancane bristles. Kuyathakazelisa ukuthi amanye amalungu parapodium iqembu siguqulelwa zokuphefumula.

Njengoba namanye amalungu uhlobo annedil (iminyundu Oligochaeta) kusukela umzimba isilwane esinjalo eyenziwe ngesikhumba-kwemisipha sac. Ngenhla umzimba worm embozwe cuticle mncane zokuzivikela, esemgwaqweni ngaphansi epithelium olulodwa-ungqimba. Ngezansi isikhumba bunemisipha, esakhiwa imisipha longitudinal futhi eziyiziyingelezi banesibopho ukunyakaza futhi ukunciphisa umzimba wesilwane.

izimpethu Polychaete: isakhiwo sangaphakathi

Abamele lesi sigaba abe isimiso sokugaya ukudla bungene sasivumela evuthiwe, okuyinto liqukethe izingxenye ezintathu. Ngaphambili okuyingxenye siqukethe le umlomo esivula singene ngalo ingaphakathi ngomlomo. Khona-ke ucezu ukudla iwela pharynx kwemisipha. By the way, e-pharynx iqukethe imihlathi chitin enamandla. Ezinye izinhlobo ngisho ukwazi ijikise phandle.

Ngemva ukugaya ukudla emphinjeni, ephumela nezindlala main ezikhiqiza ngamathe. a abamele ezimbalwa kuphela babe isisu encane. I midgut sesilwane isetshenziselwa ukuqeda eziswini kanye ukumuncwa izakhi ezibalulekile. Isigaba ezingemuva emathunjini unesibopho kumiswa indle futhi ingquza kuvula phezu amaphiko ingxenye Lobe bendunu.

izimpethu Polychaete abe avaliwe isimiso sokujikeleza kwegazi, esakhiwa amaphiko nokuvaleka kwemithambo ventral. By the way, umkhumbi amaphiko inkulu futhi inamandla contractile umsebenzi, ngakho-ke usebenza like inhliziyo. Ngaphezu kwalokho, imithambo ezinkulu zixhunywe okuthiwa izitsha annular ukuthi athwala igazi emikhawulweni futhi zokuphefumula.

uhlelo zokuphefumula e bale ekilasini engekho. emizimbeni ukudluliswa negesi kukhona esikhumbeni futhi gills zazo wahlela kunoma parapodia, noma ngaphambili, inhloko esigabeni umzimba.

uhlelo Kwabiwa siqukethe metanephridia elincane ukususa imikhiqizo engadingeki umzimba uketshezi coelomic ku imvelo bangaphandle. Isigaba ngasinye has pair ayo kwezitho excretory ukuthi uvule aphume izimbobo ezincane - nefroporami.

Njengoba isimiso sezinzwa, sifaka indandatho ejwayelekile peripharyngeal, okuyinto isuka ventral emsipheni intambo. Kuyathakazelisa ukuthi cishe zonke amalungu alesi sigaba kufanele okuthuthuke kakhulu izinhlaka touch futhi nephunga. Olunye uhlobo, kukhona amehlo.

izimpethu Polychaete: uhlelo zokuzala nokukhiqizwa

Okokuqala-ke Kuyaphawuleka ukuthi cishe zonke lezi zinhlobo leli qembu labo abazokwazi ukukhiqizwa kabusha asexual, okuyinto ezimweni eziningi emelelwa nokwehlukaniswa umzimba, akuvamile by luthela.

Noma kunjalo, izilwane abe uhlelo zokuzala evuthiwe. Lokuzaliswa izimpethu kuphela dioecious. Gonads akhiwa odongeni yesibili umzimba ingaphakathi. Liberation lwegciwane amaseli esiyolandelwa ngokusebenzisa izicubu igebe - kulokhu umuntu omdala uyafa. Abanye abameleli babe ukuvuleka ethize lapho eyabiwe ngayo, siphinde gametes. Kokukhulelwa kwenzeka i osebenzelana aqueous. Kusukela zygote eba isibungu, okuyinto ngokusobala ufana kangako omdala. Ngakho, ukuthuthukiswa impethu abasha kwenzeka nge baye bathi sebeshintshe ngokuphelele.