
nodicoeloseras

aadyakaala jurassic kaalaghattatthinte aadyakaalam muthal madhyakalam vare jeevichirunna amonitinte janussaanu nodicoeloseras. falsiferum sonile eksaraattam sabson muthal biphron sonile kammyoon sabson vare eee janussile amgangal nilaninnirunnu. europe, vadakkan aphrica, eshya, vadakke america, thekke america ennividangalil ivayude fossilukal kandethi. ithu orupakshe "dactilioseras (oorthoodaaktilaittukal)" allengil "kedonoseras" ennivayil ninnu parinamikkukayum "mesodactiliteukal" srishtikkukayum cheythu.
vivaranam.
eee janussilpetta amoniteukal mithamaayi kaadikon shellukalaayi parinamikkunnu. convex vashangalum loow ventarum ulla vishaadamulla chuzhalukal vorl vibhaagathinte savisheshathayaanu. tuberculeukal allengil nattellukal kooduthalum ulla ventrolaattal tholinte sthaanathu vaariyellukal vibhajikkunnu.
paryaayapadangal.
mesodactiliteukal", "fibulocoeloseras" enniva chilappol "nodicoeloseras" ennathinte paryayangalaayi kanakkaakkappedunnu, mattu samayangalil avaa oru saadhuvaaya janussai kanakkaakkappedunnu.