Brachiopods muaj keeb kwm ntev heev ntawm lub neej hauv ntiaj teb; tsawg 550 lab xyoo. Lawv thawj zaug tshwm sim li pob zeb hauv pob zeb ntawm lub hnub nyoog Cambrian ntxov tshaj plaws thiab lawv cov xeeb leej xeeb ntxwv muaj sia nyob, txawm tias tsis tshua muaj, nyob rau hnub no cov dej hiav txwv thiab hiav txwv.
Brachiopods nyob ntev npaum li cas?
Brachiopods muaj cov ntaub ntawv fossil uas nws kim heev, thawj zaug tshwm sim hauv pob zeb hnub rov qab mus rau lub sijhawm thaum ntxov ntawm Cambrian Period, txog 541 lab xyoo dhau los. Lawv muaj ntau heev thaum lub sij hawm Paleozoic Era, mus txog lawv cov kev sib txawv ntau tshaj li 400 lab xyoo dhau los, thaum lub sij hawm Devonian.
Vim li cas cov brachiopods thiaj li ploj mus?
Tshauv los ntawm sab hnub poob Tuam Tshoj Emeishan Traps, piv txwv li, hnub tim rau Capitanian thiab yav dhau los tau cuam tshuam los ntawm qhov ua rau muaj peev xwm ua rau lub zos brachiopod extinction. Nws muaj peev xwm "uas nce atmospheric carbon dioxide [los ntawm volcanic eruptions] coj mus rau dej hiav txwv acidification," Bond hais.
Puas yog brachiopods tua poj koob yawm txwv ntawm bivalve molluscs?
Brachiopods yog cov pob txha loj heev thoob plaws Palaeozoic. … Ua ntej qhov kev tshwm sim ploj mus, brachiopods muaj ntau thiab ntau yam tshaj li bivalve mollusks. Tom qab ntawd, hauv Mesozoic, lawv qhov sib txawv thiab cov lej tau txo qis heev thiab lawv tau hloov pauv los ntawm bivalve molluscs.
Ib puag ncig twg brachiopods nyob?
Brachiopods nyob rau dej hiav txwv pem teb. Lawv tau pom nyob hauv ibQhov ntau ntawm cov dej tob los ntawm cov dej ntiav heev ntawm cov pob zeb shorelines mus rau dej hiav txwv pem teb peb thiab ib nrab mais hauv qab dej hiav txwv. Lawv paub los ntawm ntau qhov chaw, xws li cov dej sov sov ntawm Caribbean mus rau lub hiav txwv Antarctic txias.
