Ancient kifi crossopterygian

Crossopterygii kifi ne daya daga cikin mafi tsoho jinsunan kifaye sani ga mutum. Har ya zuwa farkon karni na ashirin aka mai da su dadaddun for game da 70 miliyan. Shekaru da suka wuce. Su burbushin ragowar da aka samu a da yawa ruwa tare da marine ruwa na duniya. Hankali jarrabawa na burbushin ya yarda da masana kimiyya ya bayar da shawarar cewa wadannan kifaye kasance a cikin category na yara wajen tsanani. Wurare da dama a conical hakora, mai iko musculature da jiki wajen nagari tsawon (daga 7 cm zuwa 5 m) ne wata dabba yi tsanani contender a wani ruwa-ruwa yanayi.

Its sunan crossopterygian kifi samu daga m tsarin kwarangwal na fleshy fins. Yana kunshi dama branched a cikin nau'i na goga segments. Irin wannan tsarin da ƙege ba kawai damar da kifi ya ciyar quite lokaci mai tsawo a kasa da tafki, amma kuma nasarar motsa tare da kasa da taimakon fins. Babban sakamakon wadannan yunkuri zama quite m musculature.

Bayan yin la'akari da dukan bayanai, zamani masana kimiyya sun zo ga ƙarshe cewa janar halaye na kifi damar zuwa zana wani layi daya tsakanin Crossopterygii kifi da kuma farkon halittar dabba mai kafafuwa. Wannan ƙarshe dogara ne a kan wasu ban sha'awa fasali, akwai a duka biyu azuzuwan. Daya shaida wannan ka'ida an mai suna Tiktaalik. Ana alaka Crossopterygii kifi, baiwa da kyau kamannuna kada, shi ya most yawan siffofin, hada shi tare da halittar dabba mai kafafuwa. Yana da biyu numfashin: gill da kuma huhu da ƙege ne kusan reminiscent na tsarin da dabba ta wata gabar jiki.

Bisa dukkan sama kimiyya ya zo ga ƙarshe cewa kifi superorder crossopterygian dauki wani aiki sashi a cikin juyin halitta daga halittar dabba mai kafafuwa, ya rayuwa a duniya da sauran halittu, kuma shi ne gaba daya bitattu.

Duk da haka, wannan tabbatarwa aka dauke mai kyau kawai har shekara ta 1938, a lokacin da wata babbar kugi tsakanin masana kimiyya ya samar da wani sabon abu kifi kama a Afrika ta Kudu. Nazarin gaba kama a talakawa kama kifi trawler, Ms Latimer ci karo da m blue kifi tsawon game da 150 cm da kuma yin la'akari game da 57 kg. Domin ya samu na mace tafi zuwa ga gidan kayan gargajiya, duk da haka, bai iya sanin takamaiman misali na ainihi. Samun babu damar ajiye kifi da rai, Latimer amfani cushe taxidermist samar da wannan dabba. Abin mamaki shi ne sanannen Farfesa Smith, a lõkacin da ya gan wannan nuna dukan halaye na wakilin Crossopterygii tawagar. Bayan na sosai jarrabawa da kuma bincike na binciken wannan kifi ne mai suna a cikin girmamawa ga mace wanda ya buɗe ta haske. Yanzu Latimeria chalumnae - kadai rai Crossopterygii kifi a duniya.

Talla tashe game da sabon abu samu, haddasa mutane da yawa zuwa rush a search na m mazaunan tafkunan. Duk da haka, da coelacanth kama da sauri kashe, hana halitta mazauninsu. An saboda haka aka hana a free kama "tayar da" kifi da manyan yawan dauki wani m jihar kariya.

Crossopterygii coelacanth kifi, kamar su kakaninmu, suna da karfi da yara. Kamar miliyoyin shekaru da suka wuce, suka wahayi zuwa gare su ji tsõro a cikin su ya shafa da yawa kaifi hakora da kuma karfi sturdy ƙege da cewa kama dabba paws. Karkashin murfin na dare mafaka coelacanth lurk a da ganima: squid da karami kifi. Duk da haka, da kuma da kansu iya zama abincin dare domin ya fi girma da yara, waɗanda suke sharks.

Mai manyan samfurori da wannan nau'in kai a game da tsawon mita 2 kuma ku auna nauyi kusa da 100 kg. A tsawon wani jariri coelacanth jiki ne game da 33 cm. Masana kimiyya yi imani da cewa yara suna girma wajen sannu a hankali, amma godiya ga propensity na dogon rayuwa a sakamakon girma a wani fairly manyan samfurori.