Polychaete tsutsotsi: taƙaitaccen bayanin da aji

Polychaete tsutsotsi a halin yanzu dauke da most rukuni na marine kwayoyin. Mafi na kowa wakilan da aji live at a ƙarƙashin teku jiki na ruwa, da kuma yawa m iya kai wani planktonic hanyarsa ta rayuwa.

Polychaete tsutsotsi: jiki gini

Wakilin wannan aji jiki kunshi da shugaban sashen, dogon jiki da kuma takamaiman tsuliya lobe. A mafi yawan lokuta, jikin dabba ne a fili ya kasu kashi da dama segments, kowanne daga wanda aka a haɗe parapodium.

Parapodia wakiltar wani abu kuma fiye da m ƙwarai da wani kananan gashin baki da bristles. Yana da ban sha'awa cewa wasu 'yan kungiyar parapodium canza kama zuwa gills.

Kamar yadda da wasu mambobi na da irin annedil (leeches Oligochaeta) daga irin wannan dabba jiki da aka yi da fata-murdede jakar kwai. Sama da tsutsa jiki da aka rufe bakin ciki tare da m cuticle, wanda aka located a karkashin guda-Layer epithelium. Kasa fata ne tsokoki, wanda ya kunshi tsaye da kuma madauwari tsokoki da suke da alhakin motsi da kuma rage dabba ta jiki.

Polychaete tsutsotsi: da ciki tsarin

Wakilai daga wannan aji da fairly da kyau-ɓullo da tsarin narkewa kamar, wanda ya kunshi sassa uku. A gaban part kunshi da bakinka cewa ya buɗe a cikin baka rami. Sa'an nan a yanki na abinci da dama a cikin murdede pharynx. Af, a cikin pharynx ƙunshi iko jaws na chitin. Wasu jinsunan ne ko iya karkatar da shi daga.

Bayan nika abinci a cikin esophagus, wanda ya buɗe babban gland da cewa samar da yau. Kawai 'yan wakilan da kananan ciki. A midgut na dabba da aka yi amfani da don kammala digesting da sha na muhimman abubuwan gina jiki. A na baya sashe na hanji shi ne alhakin da samuwar tumbi da dubura yana buɗewa a kan dorsal ɓangare na tsuliya lobe.

Polychaete tsutsotsi da rufaffiyar jijiyoyi, wadda ta ƙunshi na dorsal da ventral jijiyoyi. Af, da dorsal jirgin ruwa ne, kuma yana da manyan contractile aiki, don haka yake aiki kamar zuciya. Bugu da ƙari kuma, manyan jijiyoyi da alaka da abin da ake kira annular tasoshin da cewa kawo jini zuwa extremities da kuma gills.

Tsarin Numfashi a wakilan wannan aji ne mãsu fakowa ba. Gas canja wurin jikin su ne fata da kuma gills wanda aka shirya a kan ko dai parapodia, ko dai a cikin gaban, shugaban na jiki sashe.

kasafi tsarin kunshi kananan metanephridia wanda cire maras so na rayuwa kayayyakin na coelomic ruwa a cikin external yanayi. Kowane sashi na da biyu daga excretory gabobin cewa bude fitar da kananan ramuka - nefroporami.

Kamar yadda juyayi tsarin, shi ya hada wani hali peripharyngeal zobe, wanda ya tafi daga ventral jijiya igiyar. Yana da ban sha'awa cewa kusan duk 'yan wannan aji da sosai raya gabobin da touch da wari. A wasu jinsunan, akwai idanu.

Polychaete tsutsotsi: haihuwa tsarin da haifuwa

Domin a farkon shi ne ya kamata a lura da cewa kusan duk jinsunan wannan kungiyar ne iya sake yiwuwar tohowarsu, wanda a mafi yawan lokuta aka wakilta fragmentation na jiki, da wuya ta dake tasowa.

Duk da haka, da dabbobi da kyau-ɓullo da haihuwa tsarin. Haifuwa na musamman iri guda ba tsutsotsi. Gonads aka kafa a kan bango na sakandare jiki kogo. Liberation of jam sel iya za'ayi ta hanyar nama rata - a cikin wannan harka fara tasawa mutum ya mutu. Wasu wakilan da takamaiman takware ta hanyar abin da kasaftawa da kuma gametes. Hadi auku a wani ruwa-ruwa matsakaici. Daga zygote tasowa a tsutsa, wanda a fili shaida, kadan kama da adult. Haka kuma, da cin gaban matasa tsutsa ya auku tare da metamorphosis.