Type Chordates: 'ole a me ka ulu ana o ka Amphioxus

? Ac? O Amphioxus a me kona kahua hoʻonohonohoʻana kulana no ka lōʻihi manawa noho i ka mea pohihihi. Ano,ʻepekema ike no kekahi i keia mea 'elele o ka' ano o Chordatesʻauhau'ēʻaʻe? Acaeoey.

General ano o keʻano o ka Chordates

Fish, amphibians, mea kolo, manu, mammals - kēia mau holoholona a pau i 'elele o ka' ano o Chordates. He aha e hoohui mai ia ia kekahi mau meaola? Ua huli mai i ka mea, a pau i ka na kumumanao o ka 'ole.

Ma ka 'ōlelo o ke kino o ka iho iwi, a ua kapaia ka chord. Ma Amphioxus ka mea, pilikia ma ke ola. Ma luna o ka chord o ka neural Tube. Ma metamorphosis ka hapanui o na elele o keʻano ka mea, ua hana spinal kaula a me ka lolo. Ma lalo iho iwi liʻiliʻi ua hoʻokino like me ka Tube. Ke kania-i o chord i halo o mua oä. I? Ueo i noho i loko o ka wai, i kēia hiʻona ua hoopaa iho, oiai mea ano wale no embryonic kūpono 'ana i ka aina.

Mōʻaukala o ka Kaka Amphioxus

No ke aha la Amphioxus hooulu ana i ka lōʻihi manawa, kena ae la i kekahi wahi lihi iki o ka hoopaapaa a me ka nīnau? Ka mea o ia no ka lōʻihi manawaʻo ia i noʻonoʻo i ka mollusk. Amphioxus (Hawaii photo lalo wehewehe kona mawaho 'ole) maoli nana e like kēia mau holoholona. He mea he pahee translucent kino a me ka noho ana ma ka wai i hoʻolilo 'ia - i loko o ka wai ka papau o ka moana a me ka moana. Akā, oi loa aku hoi ka mea maloko hoʻolālā mea hiki, e hōʻike iā lākou i loko o ka kaʻawale kahua hoʻonohonohoʻana naehana.

Eia hou kekahi, hoomaikai i ka hoʻoikaikaʻana Petra Pallasa a me Aleksandra Kovalevskogo i loaʻa ua mau holoholona i nā kūpuna o kēia vertebrates. ʻepekema kapa mau meaola ola fossils. Ua Ua manaoio ia lancelet ole Hawaiʻi, e like me kēlā wahi aku me hakuloli i ka 'āina a me ka aoao o ke ola i loko o ka wa e kaawale aku o nā kānaka hoʻokūkū.

Hiʻona o ka mea mawaho 'ole

Aie i ke kino kinona o keia holoholona ka mea, mai ka hana inoa - lancelet. Photo hōʻike i ke kino kohu he kahikoʻoki lāʻau lapaʻau mea kani i wānana ma nāʻaoʻaoʻelua. Ua kapaʻia ka lancet. Kēia similarity wahi aku me ka wehewehe i nā hiʻona o ka mea mawaho 'ole.

Amphioxus kino Ua hoopuni aku aoao, a ma oa ma o ka hopena i kā mākou lōʻihi o ka 8 knm ihoiho.. Ma kekahiʻaoʻao o ka lonikū pa kino 'ano apau loa haloʻole - dorsal a me ka caudal. ua kanu Lancelet hope hope o ke kino i loko o ke one. Ma ke alo o preoral lua pele, hoopuniia e tentacles.

Iwi a me nāʻiʻo

? Ac? O Amphioxus wehewehe aku ma ka manaopaa o ka chord ma kona ola. Ma ka ili aku ai no ka mea, hiki ma ke kino holoʻokoʻa, mai ke alo a hiki i ka hope hopena. Ma na aoao elua o ka chord i hoonohonoho ia ma ka helu o nāʻiʻo. Kēia 'ole o ka locomotor'ōnaehana e leie aku Amphioxus neʻe uniformly. Muscle contractions alakai i anuenue ana i ke kino, a ma ka mea o ka chord o kona rectification.

maloko 'ole

Amphioxus kino kuahene a pau physiological nenoai. Digestive hōʻike ku una hamama, puʻu, a me ka naʻau liʻiliʻi ma-Tube me hepatic outgrowth, i hanaʻia ai ka hana o ka prostate gland. Byʻano o ka mana Amphioxus e heterotrophic Kānana feeders. Kēia kaʻina ua pili loa me ka hanu, a ua lawe mai ma ka halo o mua, a me ka pau kino 'ilikai hou pili.

Ma okolozhabernuyu lua a me nā loko hamama koho. Ka mea, i na poe ma ka lehulehu hui kaulua paipu - Nephridia. Amphioxus circulatory nenoaiu unclosed. Ua ninoieo o ventral a me ka dorsal moku.

Amphioxus reproductive nā loko kapa gonads. Kēia hui kaulua glands o ka nui i hiki a hiki i ka 25. Amphioxus i dioecious holoholona. No laila, ka mea, hoʻomōhala ovaries paha testes. Wahine ducts, mau holoholona e ole i. Nolaila, keena komo i ka lua ma kaʻoluʻolu o okolozhabernuyu gonads a me ke kino pā.

Nā'ōlelo a me ka ulu ana

Reproductive nā loko o Amphioxus hoolako i kā lākou mawaho fertilization. Gametes i aia i loko o ka wai, kahi e coalesce. Na wahine kau mai i ko lakou mau hua ma hope o ka napoo ana i loko o nā kau, koe ka hooilo. Lākou germ keena pihaʻi loa uuku hua yolk, a wehewehe aku ma ka mea uuku nui - ma kahi o 100 mau microns.

E like ma mua o ka hoea ana o ka hua manu Contents Amphioxus differentiated i loko o ekolu germ papa: ecto, meso a me ka endoderm. Ma mahope māhele kēlā o ka i 'ano apau loa i ka lakou mau hui, kēia kahua.

? Ac? O Amphioxus, oia ka manaʻo e pili ana i nā hiʻona o kēia kaʻina hana i loko o chordates. Ua ninoieo o ka moʻo o ka mea i hahai ana ka mea mamuli o kekahi keʻano o ka hanaʻana o ka fertilization, cleavage, gastro a me ka neurulation organogeneza.Razmnozhenie Amphioxus, e like me kā lākou hou 'ana e pili loa ua hoʻopili i ka wai. O ka fertilized hua i 4-5 lā ulu larva. He mea he nui mai e 5mm a me ka lana o ka 'elele i loko o ka wai ka kekahi i ka cilia lehulehu. Ke larval ke kahua mau ma kahi o 3 mahina. I ka po ka mea, puka mai a hiki i ka wai luna, a ma ka lā e poholo.

Amfioksidy - no laila, i kapaʻia kanaka nunui larvae o Amphioxus, i mea ka kŰia o ko ke ao nei holoholona. Mua, ka mea i kuhihewa no nā mākua. Akā, haʻawina lehulehu ka mea i manao ia e noho wale ma luna o ka ili o ka wai i loko o ka haku mele 'ana o ka plankton. Amfioksidy mea hiki a hiki i 11 mm, aua oia i ka hiʻona o ka larval hale. Ua uhi i ko lakou kino i cilia,ʻaneʻane undeveloped ku una tentacles okolozhabernaya lua a me gonads.

No laila, Amphioxus i primitive meaola chordates. Ka mea, e pili ana i ka subtype bescherepnyh, papa Golovohordovye. Amphioxus wehewehe aku ma ka sedentary Aloha Hawaii, i dioecious holoholona me ka mawaho fertilization a me kaʻauhau'ēʻaʻeʻano o? Acaeoey.