Crabs yog arthropod tsiaj Crabs are evolved. Lawv muaj peev xwm nyob twj ywm tawm ntawm cov dej, uas lawv yuav tsum tau ua pa, ntev. Qhov no yog vim lawv khaws cov dej hauv, zoo li yog lub kaw lus kaw, hloov pauv ib ntus.
Nyob rau hauv tsab xov xwm no peb tham txog hom crabs uas muaj nyob rau hauv lub ntiaj teb no, pib los ntawm kev piav qhia lub ntsiab yam ntxwv ntawm cov crabs. Peb tseem yuav qhia koj cov npe tag nrog cov npe thiab cov duab kom koj kawm paub txog lawv. Mus nyeem ntawv!
Kab Cab
The crabs yog crustacean arthropods belongs to the infraorder Brachyura. Lawv lub cev qauv yog tshwj xeeb heev. Yog hais tias, ib txwm, lub cev ntawm arthropods muab faib ua lub taub hau, thorax thiab lub plab mog, crabs muaj cov no 3 fused lub cevSaum toj no tag nrho, lub plab, uas yog heev txo. thiab nyob hauv qab lub plhaub.
Crab shells yog dav heev, feem ntau yog wider than long, ua rau lawv flattened heev. Lawv muaj tsib khub ob txhais ceg los yog appendages. Thawj khub ntawm appendages, hu ua chelicerae, yog overgrown nyob rau hauv cov txiv neej ntawm ntau hom.
Lawv tuaj yeem nkag mus rau pem hauv ntej maj mam, tab sis feem ntau txav mus rau sab, tshwj xeeb tshaj yog thaum nkag tau sai. Feem ntau cov roob ris ua luam dej tsis tau, txawm hais tias nyob rau hauv qee hom kab kawg ob txhais ceg xaus rau hauv ib hom dav, flattened paddle lossis oar, uas ua rau lawv tso cai rau qee qhov chaw ua luam dej.
CRABs Tam Sim No Khomob Rau Cov Pej Xeem, nyob ze ntawm qhov muag. Lub circulatory system ntawm crabs yog qhib. Qhov no txhais tau hais tias qee zaum cov ntshav mus los ntawm cov hlab ntsha thiab cov hlab ntsha thiab, lwm lub sijhawm, nws tau nchuav rau hauv lub cev sab hauv. Lawv nthuav tawm lub plawv uas tuaj yeem muaj cov duab sib txawv, nrog ostioles, uas yog qhov uas cov ntshav nkag mus rau hauv lub plawv los ntawm lub cev, thiab tom qab ntawd taug kev los ntawm cov hlab ntsha.
Crab is omnivorous animal. Lawv tuaj yeem noj tau algae, ntses, molluscs, carrion, kab mob thiab ntau lwm yam kab mob. Ntawm qhov tod tes, lawv yog cov tsiaj txhu oviparous, lawv yug los ntawm qeLos ntawm cov qe no tuaj larvae uas yuav kis tau ntau theem ntawm metamorphosis kom txog thaum lawv mus txog rau cov neeg laus.
Nyob ntiaj teb no muaj txog 4,500 hom crabs los yog hom Cov tsiaj no feem ntau nyob hauv thaj chaw intertidal, xws li ntug hiav txwv dej., estuaries thiab mangroves. Lwm tus nyob hauv cov dej tob me ntsis, thiab qee hom txawm nyob hauv qhov chaw tsis zoo li dej hiav txwv hydrothermal vents, uas ncav cuag qhov kub txog li 400 ºC.
1. Fiddler Crab
The fiddler crab (Uca pugnax) inhabits many coastal marshes along the coasts of the Atlantic Ocean. Lawv yog burrow builders uas lawv siv los nkaum ntawm cov tsiaj nyeg, yug me nyuam, thiab hibernate thaum lub caij ntuj no. Lawv yog cov me me me, txog 3 cm
Lawv muaj kev sib deev dimorphism, yog qhov tsaus ntsuab tshaj plaws nrog thaj chaw xiav nyob hauv nruab nrab ntawm lub plhaub. Poj niam tsis muaj qhov chaw ntawd. Cov txiv neej kuj tuaj yeem nthuav tawm chelicerae nrog kev loj hlobthiab, qee zaum, ob qho tib si. Thaum sib tham, cov txiv neej txav lawv cov chelicerae zoo li lawv ua si violin.
ob. Christmas Island Red Crab
The red crab (Gecarcoidea natalis) is endemic to Christmas Island, Australia Lawv nyob ib leeg hauv hav zoov, siv lub hli qhuav faus rau hauv av, hibernating. Thaum lub caij ntuj nag pib, thaum lub caij nplooj zeeg, cov tsiaj no ua tau zoo kawg nkaus migration mus rau hiav txwv, qhov chaw lawv sib yuav.
Red crab pups yug hauv dej hiav txwv, lawv siv ib lub hlis mus rau ntau yam metamorphoses thiaj li yuav nyob rau hauv av.
3. Japanese Giant Crab
The Japanese giant crab (Macrocheira kaempferi) nyob hauv qhov tob ntawm Dej Hiav Txwv Pacific tawm ntawm ntug dej hiav txwv ntawm Nyiv. Lawv muaj tsiaj txhu colonial, yog li lawv nyob hauvHAIV NEEG HAIV NEEG NOJ NTXHAIS Athropod uas muaj. Lawv ob txhais ceg ntsuas tau ntau tshaj ob metres ntev thiab ncav cuag 20 kilograms hnyav.
Ib yam xav paub txog cov tsiaj no yog lawv ua raws li lawv lub cev uas lawv pom nyob ib puag ncig lawv los cam lawv tus kheej. Yog hais tias lawv hloov lawv ib puag ncig, lawv hloov lawv qhov seem. Vim li no, lawv thiaj tseem hu ua "dab ntxwg nyoog"..
4. Common crayfish
The crayfish (Carcinus maenas) yog nyob rau sab hnub poob ntug dej hiav txwv ntawm Europe thiab Iceland. Txawm hais tias nws nyob hauv lwm qhov chaw ntawm lub ntiaj teb ua ib hom kab mob, piv txwv li, South Africa lossis Central America. Lawv tuaj yeem muaj ntau qhov ntxoov ntxoo, tab sis qhov tseem ceeb tshaj plaws lawv yog greenish Lawv tsis ncav cuag kev sib deev mus txog thaum lawv muaj 2 xyoos, thaum lawv ncav cuag qhov loj ntawm 5 cm Txawm li cas los xij, nws lub neej ntev yog 5 xyoos hauv cov txiv neej thiab 3 tus poj niam.
5. Atlantic Blue Crab
The Atlantic blue crab (Callinectes sapidus) yog lub npe hu ua xiav ntawm ob txhais ceg, tab sis nws lub plhaub yog xim ntsuab. Cov claws ntawm lawv cov chelicerae yog liab. Lawv yog Tam Sim No Txawm tias lawv yog Ameslikas los ntawm Dej Hiav Txwv Atlantic. Lawv tuaj yeem nyob hauv dej nrog cov xwm txheej sib txawv, dej tshiab los yog ntsev, thiab txawm tias dej qias neeg.
Muaj piv txwv ntawm crabs
Ntawm no yog cov npe ntawm lwm hom crabs:
- Patagonian crab (Lithodes santolla)
- Moorish crab (Menippe mercenaria)
- Black crab (Gecarcinus ruricula)
- Red av crab (Gecarcinus lateralis)
- Pygmy Crab (Trichodactylus borellianus)
- Swamp Crab (Pachygrapsus transversus)
- Hairy Crab (Peltarion spinosulum)
- Rock Crab (Pachygrapsus marmoratus)
- Granular crab (Neohelice granulata)
- Blue Crab (Cardisoma crassum)
