
tricrephysephalus

sharashari valippamulla tricrephysaphalidae kudumbatthile tycoperid trilobiteukalude vamshanasham sambhavicha oru janussaanu tricrephysephalus. 501 muthal 490 dasalaksham varshangalkk munbu cambrian kaalaghattatthinte avasaanathe dresbachian janthujaalangalude ghattathil ithinte enangal jeevichirunnu. vadakke amerikkayile avasaanathe cambrian nikshepangalil "tricrephysephalus" fossilukal vyaapakamaanenkilum thekke amerikkayile oru sthalathu ninnu ithu ariyappedunnu. "tricrephysephalasinu" oru vipareeta mutta aakruthiyilulla exoskelittan undu, madakkil moonnu swabhaavasavisheshathakalulla kuzhikal undu, ithu madhya uyarnna pradeshathinu thottumumbulla headshieldinte arikinode samaantharamaanu. shareerathinte madhyabhaagathinu 12 bhaagangalund, tailshieldil rund neelamulla, tubular, valanja pigidial nattellukal vahikkunnu, avaa shareerathinte samathalathil ninnu ekadesham 30° yill pinnott uyarunna iyarviginte pinsarukale anusmarippikkunnu.
vivaranam.
tricrephysephalus" ennathinte exoskelittaninte rooparekha eathaandu andaakrithiyilullathum, janal nattellukalude agrathil ettavum veethiyullathum, pigidial nattellukal ulppedaathe 1.2x veethiyullathumaaya oru vipareeta muttayaan. headshield (allengil sephalon) mithamaaya reethiyil valayam cheythirikkunnu. nannayi nirvachikkapetta central rised eriya (allengil glabella) convex, neelamulla tapering, vrithaakrithiyilulla munvashamullathum, sephaloninte pinbhaagathu kadannu osippittal ringine nirvachikkunna oru furo maathrame ulloo. osippittal ringle oru nooad undayirikkaam. sephaloninte bakkiyulla bhagangal, sthiravum swathanthravumaaya kavilukal (allengil fixijena librajina) ennu vilikkunnu. moultingil libragenia fixigeniayil ninnu verthirikkunna odivukal (allengil thunnalukal) annukalkku thottumumbil vyathichalikkukayum athirthi romathinu sameepam samaantharamaayi maarukayum arikilekku cheruthaayi othucherukayum cheiyunnu. kanninte pinbhaagathu ninnu thunnalukal oru alasamaaya vakramine pinthudarunnu, aadyam kooduthal purakottum arikinadutthum kooduthal pinnotum vyathichalikkukayum nattellinte aantharika valavinullile pinbhagam murikkukayum cheiyunnu (allengil opistoperiyan thunnalukal). savisheshamaayi, maarjinu (allengil boarder pharoo) samaantharamaayi ulla faroik glabellike munnil 2 sradheyamallaatha kuzhikalundu, apoorvvamaayi valare mangiya moonnaamathe median kuzhiyundu. kannine glabellayumaayi bandhippikkunna malanjerivukalonnumilla. idatharam valippamulla annukal (glabella neelatthil 1/3x-ll kooduthal) glabella madhyabhaagathinu alppam pinnilaanu. oru thorax segmentilekku pinnott neengunna cheria nattellukalil avasaanikkunna janal angle. shareerathinte madhyabhaagathinu (allengil thondaykku) 12 bhaagangalund. aksham convex aanu, athinte vashangalil pleura ennu vilikkappedunna ooronninekkaalum 1⁄2x ll thaazhe veethiyundu. bhagangal oru vrithaakrithiyilulla munvashath (faalkkett ennu vilikkunna aakruthi) vashathekku choondunnu. tailshieldinu (allengil pigidium) sephaloninekkaal ekadesham 1⁄2x veethiyundu, vishalamaaya akalamulla rund nattellukal ozhike ekadesham eratti veethiyundu. iva bakkiyulla shareeravumaayi ekadesham 30° konilaanu. pigidiyatthile achuthandu veethiyinekkaal 11⁄4x neelamullathaanu, eathaandu samanthara vashangalulla, ekadesham pinbhaagathe arikukalil athunnu, 3 allengil 4 aksha valayangal; 3 settu interplural groovukalum pleural furokalum maarjinte akalatthil avasaanikkunnu. pigidiyatthil oru athirthi nirvachikkunna oru arayumilla.
meteriospis" ennathumaayulla vyathyaasangal.
"meteeraaspisinu" munvashathe athirthi arayil rund thulyamaaya pradhana kuzhikalundu, kooduthal valayam cheytha sephalon, cheria nattellukal randaam thorax segmentilekku athunnu, 13 thorax segmentukal, rund paranna, sraavinte pallu aakruthiyilulla, vishalamaaya akalamulla nattellukal paijidiyathil.
paristhithi.
"tii. koosia", "crepicephalus", "kingstoniya", "syoodagnostina", "koosina" ennee janussil ninnulla trilobite inangalumaayi tripenktattas "orumichu kaanapedunnu.