aahkyarra echinoids myarr kaeshoet a aarwalrout pyee suu sell dawlar eat aalaunggmyarrko, radial symmetry hpawpyaraan . sell dawlar aatwat pw ng lwhar kaeshoet ponehcan pout ngarrhku twal taannhce parwainparsai . aasopar a pout ko hkandharko k naydharatngwae exchangeproject myarraatwat podia saw endoskeletonthrough aatwat hpout htarr kyasai . sell dawlarhcyaayy eat nhuat taw htwat saeet pw ng lwhar kaeshoet ponehcan eat baho mhar yainneat ko htai eat aouthkyay pawmhar taishipartaal . aahkyarra urchins matuubhell, sell dawlar eat aalaunggmyarrko kolaeeaalaaltaann Front-To- pyannhaitninengan symmetry hpawpyaraan . sell dawlar eat hc ao aahkyahoetsaw myoehcate aatwat htainsharrkyawkyarrsaw popyee aamyarraapyarrnhaitninengan features tway nhaint aatuu nout kyaww mhar htaataamyarrsone urchins htellmhar shi sakaeshoet a htiut mhar taishipartaal . muul k kaaout Burrow kyountsattawarmyarr (endobenthos) ko painlaalkyampyin (epibenthos) eat htiut pawmhar suuthoet bhaw nayhtine hkaekyaungg sattawarmyarr a nay hpyint ၎innthoeteat saint kell hpyithcain myarreat sainroe htellmhar sell dawlar myarreat litelyawwnyehtway, i ralad .
bhone sell dawlarhcyaayy, Echinarachnius parma, intertidal jone k nay myawwatpine hkyam eat samuddarar ray htellmhar hc 