Qwj yog rau chav kawm ntawm gastropods. Qhov no yog chav kawm ntau kawg nkaus uas muaj ib hom tsiaj - molluscs. Gastropods suav nrog txog 100,000 ntau hom. Hauv tebchaws Lavxias, muaj txog 1620 hom ntawm txhua yam qwj thiab qwj.
Cov qwj puas muaj hniav?
Muaj, tab sis conditionally, txij li lawv tsis tau nyob raws nraim li hauv feem ntau vertebrates. Thiab nws tsis yog tiag tiag cov hniav. Cov no yog cov sib tov radulas - chitinous bands uas muaj ntau txhiab chitinous "hniav". Tab sis cov "cov hniav no" tsis tom los ntawm cov khoom noj, tab sis txhuam nws tawm.
Qiv Nqaij Nqaij Qwj siv cov qwj noj tshwj xeeb uas lawv tau ua ua ntej yuav noj mov. Qhov no tso cai rau koj ua kom cov khoom noj yav tom ntej.
Qhov tseeb yog tias tus nplaig ntawm qwj yog grater. Nws tau txais nws lub npe meej vim qhov tseeb tias ib tus qwj scrapes tawm ntawm cov khoom noj, cov ntses ntses thiab lwm yam muaj peev xwm nrog nws. Tus nplaig grater yog qhov tseem ceeb rau kev sib tsoo cov zaub mov tshwj xeeb los ntawm qwj. Tib lub radula (chitinous daim kab xev) yog nyob ncaj qha rau ntawm tus nplaig. Feem ntau, daim kab xev chitinous thiab grater raug sib xyaw ua ke rau hauv ib qho thiab tib lub tswvyim - lus.
Lub ribbon radula pom nyob rau hauv ob qho tib si qwj carnivorous thiab slugs (liab qab qwj) thiab herbivores. Tsuas muaj ib qhov sib txawv ntawm no: hauv ntau hom ntawm cov mollusks, cov chitinous daim kab xev nws muaj nws tus kheej "kho hniav" qauv.
Muaj pes tsawg tus hniav ua qwj?
Tau ntev, kev tshawb fawb tsis paub tias muaj pes tsawg hniav nyob hauv lub qhov ncauj qwj. Txawm li cas los xij, lub sijhawm tsis sawv twj ywm: cov kws tshawb fawb tau ua ntau txoj kev tshawb nrhiav thiab sim nrog mollusks thiab pom tias muaj pes tsawg tus hniav muaj nyob hauv lub qhov ncauj ntawm qee tus qwj. Nws hloov tawm tias Asmeskas lub vaj qwj tau muaj 135 kab me me ntawm nws cov hniav chitinous, txhua tus ntawm muaj xws li 105 hniav. Yog tias koj suav, tom qab ntawd lawv tus lej yuav suav tau 14175. Tus qwj no yog tus khaws cov ntaub ntawv rau tus naj npawb ntawm cov hniav!
Cov qwj kaus hniav ua hauj lwm li cas?
Qwj txhuam hniav yog txawb. Vim tias lawv qee qhov kev txav mus los, tus mollusk thawb cov zaub mov rau hauv nws lub qhov ncauj, scraping nws tawm: cov zaub mov maj mam tab sis muaj tseeb thawb mus rau hauv lub qwj lub esophagus. Tus nplaig (chitinous daim kab xev) ntawm mollusks grinds cov zaub mov zoo heev, tab sis tsis muaj yam tsis poob rau qwj nws tus kheej. Qhov tseeb yog tias nws cov hniav me me tas li thiab nyob rau hauv ntau qhov yuam kom hnav tawm.
Tus qwj oyster auger yog carnivorous. Nws txoj kev noj mov tsis tuaj yeem tsis meej pem nrog lwm tus: nws tho qhov plhaub ntawm tus nplaig thiab khav theeb muab nws nqaij tawm nrog tus nplaig.
Nws yog tsim nyog sau cia tias rau molluscs, hnav-tawm hniav tsis yog qhov teeb meem txhua. Qhov tseeb yog tias lawv cov hniav nce siab tas li thiab sai sai. Hauv txoj cai, xws li kev tsim dua tshiab hauv qwj lub qhov ncauj kab noj hniav zoo li lub hniav txuas ntawm tus ntses tsis tu ncua.
