Lub mandible yog lub puab tsaig sab sauv ntawm tus arthropod. Qhov no ib feem ntawm lub qhov ncauj apparatus muaj ib tug khub ntawm zoo tib yam ntsiab. Hauv ntau kab, nrog rau hauv cov centipedes thiab crustaceans, mandible muaj nyob rau zom zaub mov. Txawm li cas los xij, kab kev sib raug zoo muaj lwm txoj haujlwm ntawm lub caij no - lub tsev zes.
Keeb Kwm
Mandible yog tib yam li mandibles. Nws sawv cev rau cov ceg ntawm lub taub hau ntu, uas tau hloov pauv loj hauv cov txheej txheem ntawm evolution. Muaj kev xav tias cov no yog hloov pauv coxopodites thiab endites. Muaj ib zaug, cov crustaceans thaum ub tau muab nrog lawv.
Mandibles yog ib qho nyuaj, sclera-them ntu nrog txhuam thiab ntau yam hniav. Zoo li lawv qab daim di ncauj.
Txhua tus neeg sawv cev ntawm cryptomaxillaries muaj qhov tshwj xeeb ntawm cov qauv ntawm cov mandibles. Lawv txuas tsuas yog ntawm ib qho taw tes rau lub taub hau. Ob sab ntawm lawv lub qhov ncauj kab noj hniav yog securely fused nrog lub sab di ncauj (nws lateral ib feem). Raws li, hnab ris yog tsim. Lub puab tsaig yog muab tso rau hauv lawv: ob qho tib si qis thiab sab sauv. Nws yog vim qhov tshwj xeeb no uas tag nrho cov chav kawm hu ua "pob txha zais".
Nyob rau hauv kab kab thiab bristletails, ntxiv rau qhov taw tes rau sabpob qij txha, muaj ib qho ntxiv. Ua tsaug rau qhov no, lawv muaj peev xwm ua kom muaj zog kaw thiab nthuav tawm txav nrog lawv cov mandibles.
Nyob rau hauv tag nrho cov kab uas muaj mandibles, tendons txuas los ntawm qhov chaw ntawm lawv articulation nrog lub taub hau. Nws yog qhov tsim nyog rau kev sib txuas ntawm cov leeg uas tswj cov mandibles.
Ntse
Cov kab mob mandible nyob rau hauv kab yuav txawv nyob ntawm seb hom lub qhov ncauj apparatus. Raws li, koj tuaj yeem pom cov mandibles muaj ntau hom kev ua haujlwm, cov duab thiab txawm tias loj.
Yog li, Coleoptera, Hymenoptera thiab Orthoptera muaj mandibles loj heev. Tom qab tag nrho, lawv tsim nyog thiaj li yuav zom, rhuav thiab tuav zaub mov.
Flies, piv txwv li, muaj ib hom licking ntawm lub qhov ncauj apparatus. Yog li ntawd, lawv cov mandibles tsuas yog txo qis. Thiab muv yog tus yam ntxwv los ntawm ib tug gnawing-licking version ntawm lub qhov ncauj apparatus. Raws li, txawm hais tias lawv muaj mandibles, lawv txo qis heev, thiab dhau li ntawd, lawv tau poob serrations.
Nyob zoo ib tsoom niam txiv kwv tij neej tsas sawv daws.
Cov mandibles loj tshaj plaws nyob rau hauv Coleoptera, yog li nyob rau hauv stag beetle, lub mandible yog pom horns, uas yog ntxiv branched. Lub lumberjack beetle muaj lub puab tsaig muaj zog heev. Muaj ntau txoj hauv kev, cov duab thiab kev loj hlob ntawm mandibles nyob ntawm cov khoom noj tshwj xeeb ntawm cov kab tshwj xeeb.
Beetles, piv txwv li, muaj lub puab tsaig ntev ntev. Nrog lawv pab, koj tuaj yeem tau txais cov qwj tawm ntawm lub plhaub tau yooj yim.
Rau Hymenoptera, lub mandible yog lub puab tsaig sab sauv, uas zoo li lawv hom qub. Lawv sivlawv rau:
- Kill prey.
- Dab minks.
- Nkauj zes.
- Tuav koj cov zaub mov.
Tam sim no, lub puab tsaig qis muaj ib hom licking thiab tsim los sau cov dej qab zib.
In Diptera thiab Lepidoptera
Diptera's mandibles tau hloov pauv sai. Yog li, nyob rau hauv yoov tshaj cum thiab qee cov yoov uas nqus ntshav, mandibles yog stylets. Nrog lawv cov kev pab, kab pierces daim tawv nqaij. Tab sis lub housefly tau ploj tag nrho nws lub puab tsaig sab sauv. Tom qab tag nrho, nws tsuas xav tau lub qhov ncauj los noj cov kua dej xwb.
Txhua kab ntsig, Lepidoptera muaj mandibles uas muaj hom gnawing. Muaj tseeb tiag, tsuas yog mothed moths khaws lawv hauv lawv lub xeev laus. Ntau tus npauj npaim poob lawv cov mandibles. Nws hloov mus rau hauv me me nqus proboscis kom nqus dej qab zib.
Tus mandible yog kab lub puab tsaig, uas nyob rau saum. Txhua tus nyias muaj nyias mandibles, nyob ntawm lawv lub hom phiaj.
