molaska

molaska ya choornapraavaar prajaatiyon ki sankhya mein akasherookeeya ki doosari sabse badi jaati hai. 80,000 jeevit prajaatiyaan hain aur 35,000 jeevaashm prajaatiyaan maujood hain. kathin khol ki maujoodagi ke kaaran sanrakshan ka mauka badh jaata hai. ve avvalan dvidesheeya samamit hain.is sangh ke adhikaansh jantu vibhinn roopon ke samudri praani hote hain, par kuchh taaje paani aur sthal par bhi paae jaate hain. inka shareer komal aur praaya: aakaaraheen hota hai. ve koi vibhaajan naheen dikhaate aur dwipaksheeya samamiti kuchh mein kho jaata hai. shareer ek poorvakaal sir, ek prushtheeya aant koobad, reingane buroing ya tairaaki ke liye sanshodhit ek udar peshi pair hai. shareer ek kailshiym yukt khol sraavit karta hai jo ek maansal viraasat hai chaaron or yeh aantarik ho sakta hai, haalaanki khol kam ya anupasthit hai, aamtaur par baahari hai. jaati aam taur par 9 ya 10 vargeekaran vargon mein baanta gaya hai, jinmein se do poori tarah se vilupt hain. molask ka vaigyaanik adhyayan 'maalaakoloji' kaha jaata hai.ye pravar mein band rahate hain. saadhaaranataya straav dvaara kade kavach ka nirmaan karte hain. kavach kai prakaar ke hote hain. kavach ke teen star hote hain. patala baahyastar kailasiym kaarbonet ka bana hota hai aur madhyastar tatha sabse nichlaastar mukta seep ka bana hota hai. molask ki mukhya visheshata yeh hai ki kai kaaryon ke liye ek hi ang ka istemaal hota hai. udaaharan ke liye, dil aur gurde prajanan pranaali hai, saath hi sanchaar aur mal tyaagane pranaaliyon ke mahatvapoorn hisse hain baaivaalvas mein, gahre naale donon "saaains" aur utsarjan aur prajanan ke liye mahatvapoorn hai jo viraasat guha, mein ek paani ki vartamaan utpaadan. prajanan mein, molask anya prajanan saathi ko samaayojit karne ke liye ling badal sakte hain. ye skvid aur oktopoda se milte julate hain par unase kai lakshanon mein bhinn hote hain. inmein khandeebhavan naheen hota.[1]

anukram

vividhta

sabhi gyaat 80% molask prajaati mein gaistropaud ke saath-saath kaudi (ek samudri ghongha) bhi shaamil hai.

molask ki prajaatiyon mein rahane vaale varnit anumaan 50,000 se adhiktam 120,000 prajaatiyon ka hai. David nikol ne varsh 1969 mein unhonne lagbhag 107,000 mein 12,000 taaja paani ke gaistropaud aur 35,000 sthaleeya ka sambhaavit anumaan lagaaya tha.[2]

saamaanyeekrut molask

ek kaalpanik Patrick molask ke sanrachanaatmak aarekh

kyonki molask ke beech shaareerik vividhta ki bahut badi seema hone ke kaaran kai paathyapustakon mein inhe archi-molask, kaalpanik saamaanyeekrut molask, ya kaalpanik Patrick molask kaha jaata hai. iske kai visheshataaeain anya vividhta vaale jeevon mein bhi paaye jaate hai.

saamaanyeekrut molask dwipaksheeya hote hai. inke oopari taraf ek kavach bhi hota hai, jo inhe viraasat mein mila hai. isi ke saath-saath kai bina peshi ke ang shareer ke angon mein shaamil ho gaye.

guha

yeh mool roop se aise sthaan par rahana pasand karte hai, jahaan unhe prayaapt sthaan aur samudra ka taaja paani mil sake. parantu inke samooh ke kaaran yeh bhinn-bhinn sthaano mein rahate hai.

khol

yeh unako viraasat mein mila hai. is prakaar ke khol mukhya roop se enregonaait ke bane hote hai. yeh jab ande dete hai to kelsaait ka upayog karte hai.

pair

inmein neeche ki aur peshi vaale pair hote hai, jo anek paristhitiyon mein bhinn-bhinn kaaryon ko karne ke kaam aate hai. yeh kisi prakaar ke chot lagne par shleshm ko ek snehak ke roop mein sraavit karta hai, jisse kisi bhi prakaar ki chot theek ho sake. iske pair kisi kathor jagah par chipk kar use aage badhne mein sahaayata karte hai. yeh oordhvaadhar maansapeshiyon ke dvaara poori tarah se khol ke andar aa jaata hai.

sandarbh

  1. Little, L., Fowler, H.W., Coulson, J., and Onions, C.T., san (1964). "Malacology". Shorter Oxford English Dictionary. Oxford University press.
  2. David Nicol (1969), The Number of Living Species of Molluscs; Systematic Zoology, Vol. 18, No. 2 (Jun., 1969), pp. 251-254

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