केकड़ा
| chitr:Icon-edit.gif | is lekh ka punarikshan evan sampadan hona avashyak hai. ap isamean sahayata kar sakate haian. "sujhav" |
kek da krasteshiya varg ka dekapoda gan ke chhoti pooanchh vale jantu hote haian, visheshakar baikiyoora ya asali kek da, lekin enomyura jaise any jiv bhi, jo dikhane aur adatoan mean inase milate-julate ho sakate haian. sabhi mahasagaroan, mithe pani aur jamin par kek doan ki lagabhag 4,500 prajatiyaan paee jati haian. dekopoda gan ke any jantuoan [1] se bhinn kek de ki pooanchh vaksh ya sharir ke madhyakhand ke niche mudi huee hoti hai. isaka oopari kavach samanyatah chau da hota hai. pairoan ka agala jo da panje ya chimati mean roopaantarit rahata hai.
vistar aur qismean
adhikaansh kek de samudr mean rahate haian; yahaan tak ki ushnakatibandhiy deshoan mean bahutayat mean pae jane vale bhoomichar kek de bhi samanyatah kee bar samudr mean jate haian aur apane jivan ka praranbhik kal vahaan vyatit karate haian. dakshini yoorop ki nadiyoan mean paya jane vala leanten kek da (potam aaun floovietaeel) duniya ke adhikaansh garm ilaqoan mean mithe pani ke kek doan ki bahutayat ka ek udaharan hai, amataur par kek de galaph doan se saans lete haian, jo oopari khol ki bagaloan ke niche do chhidroan mean hote haian, lekin asali bhoomichar kek doan mean ye chhidr b de hokar hava mean saans lene ke lie pheph doan ki bhoomika nibhate haian. inake gaman ka samany tariqa chalana ya reangana hai, aur samany tatiy kek de ka daeean ya baeean or sarakana amataur par is samooh ke sabhi sadasyoan ka lakshan hai. partyoonidi parivar aur kuchh any parivaroan ke kek de apane chapate chappoonuma pairoan ki madad se nipunatapoorvak tairate haian.
haramit kek da
haramit kek de (paigyooridi aur koenabitidi) enomyur kek doan ki mashahoor jati hai, jo udarapadiy kavachadhari praniyoan ke khali kavachoan mean rahate haian or unhean apane sachal avas ki tarah apane sath lie chalate haian. jaise-jaise kek de ka akar badhata hai, yah apana avas samay-samay par badalata rahata hai. ushnakatibandhiy deshoan mean koenabitidi parivar ke haramit kek de samudr mean jate haian. hiand-prashaant dvipoan par paya jane vala b da lutera ya nariyal kek da (braigras letro), jo isi parivar ka sadasy hai, ne sachal avas sath lie chalane ki adat chho d di hai aur isake udar ka oopari bhag kavachi pattikaoan se dhaka rahata hai.
krasteshiya varg
kee any krasteshiya varg ke praniyoan ki tarah kek de bhi sarvabhakshi hote haian aur safaeekarmiyoan ki bhoomika nibhate haian, lekin kee kek de shikar karate haian aur kuchh shakahari hote hai. halaanki koee bhi kek da vastutah parajivi nahian hota hai, kuchh kek de any praniyoan ke sath mel-milap se rahate hai. isaka udaharan chhota pi kek da (pinatheredi) hai, jo sipiyoan aur any kee kavachadhari praniyoan ke kholoan, kit naliyoan aur akinodarm praniyo ke bhitar rahata hua apane mezaban ke bhojan mean hissedari karata hai; ek any udaharan koral-g aaul kek da (haiplokarsinidi) hai, jo kuchh mooangoan ke badhane vale kinaroan ko is prakar chho data hai ki ve yoan badhe ki mada usamean qaid ho jaee. dhimi gati se chalane vale mak di kek doan (majidi) mean se kee apane khol ko samudri ghas, spanj aur udbhid praniyoan se dhak lete haian aur saphal chhadmavesh bana lete haian. japan ka vishalakay kek da (maikrocheriya kaianpheri) aur tasmaniyaee kek da do sabase b de jnat krasteshiyan prani haian. japani kek de ke phaile hue pairoan ki nok se oopari nok tak ki lanbaee char mitar tak ho sakati hai. tasmaniyaee kek da, jisaka vazan 9 kigra se adhik ho sakata hai, ke panje chhote aur sudridh hote haian; inamean se b de vayask ki lanbaee 43 semi ho sakati hai; kisi aur b de namoone ka sharir ya oopari kavach 46 semi ka ho sakata haian. doosari or kafi chhote kek de pae jate haian, jo oopari vayask hone par bhi ek ya do semi lanbe hote haian.
adhikaansh krasteshiyan praniyoan ki tarah lagabhag sabhi kek doan mean aandoan se nikalane vale bachche apane mata-pita se kafi alag dikhate haian. larva charan mean, jise joia bhi kahate haian, yah ek sookshm paradarshi padahit gol sharir vala prani hota hai, jo samudr ki satah par tairata rahata hai. kee bar tvacha chho dane ke bad badhata hua kek da megal aaups charan se guzarata hai, jisamean sharir aur pair kek doan ki bhaanti ho jate haian, lekin udar kafi b da hota hai aur mu da hua nahian hota} ek bar aur akar badalane ke bad yah jantu vyaskoan ke saman akar grahan kar leta hai. kee kek de, visheshakar mithe pani mean pae jane vale, is roopaantaran se nahian guzarate, balki sidhe vayask ke laghu roop mean hi bahar ate haian.
arthik mahattv
khady padarth ke roop mean kee kek doan ki maang bahut jyada hai. inamean sabase mahattvapoorn aur bahumooly khady kek de british aur yooropiy tat ke kek de (kaiansar paigyooras), uttari amerika mean atalaantik tat ke nile kek de (kailinektes saipidas) aur prashaant tat ke dangenes kek de (kaiansar maigistar) hai. hiand-prashaant kshetr mean tairane vale kek de, saila aur p aaurtyoonas, jo ameriki nile kek de se sanbandhit haian, samudri khady padarth ke sabase mahattvapoorn srot haian. enompoora shreni ke lithodid (shabdik arth, patthar) kek de vanijyik drishti se moolyavan haian, jinamean japan se pare beriang sagar mean alaska ke jaliy kshetr mean paya jane vala tathakathit kiang kek da (peralithodes kaimtashaitika) sabase mahattvapoorn hai.
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tika tippani aur sandarbh
- ↑ udaharanarth, jhianga, l aaubastar, krefish
bahari k diyaan
sanbandhit lekh