Arachnids vs Crustaceans
Arachnids thiab Crustaceans yog ob pawg loj ntawm cov pob txha tsis muaj pob txha muaj nyob hauv Phylum Arthropoda uas muaj qee qhov tshwj xeeb uas muaj rau ob qho tib si, arachnids thiab crustaceans, thiab ua rau nws nyuaj rau kev pom qhov txawv ntawm ob pawg tsiaj. Cov yam ntxwv tshwj xeeb ntawm cov arthropods no yog muaj cov kab ke sib koom ua ke, chitinous exoskeleton, trachea lossis phau ntawv gills, ob lub qhov muag thiab endocrine system. Hauv tsab xov xwm no, peb yuav tham txog cov yam ntxwv ntawm lub cev ntawm arachnids thiab crustaceans, ua tib zoo kawm txog qhov tseem ceeb hauv kev paub qhov txawv ntawm arachnids thiab crustaceans. Phylum Arthropoda muaj tsib pawg loj; Cov no yog Arachnida, Crustacea, Chilipoda, Diplopoda, thiab Hexapoda (Insecta).
Arachnids yog dab tsi?
Arachnids feem ntau suav nrog scorpions, kab laug sab, mites thiab zuam. Lawv lub cev muaj ob qhov tseem ceeb; prosoma (cephalothorax) thiab opisthosoma (mob plab) nrog rau 6 khub ntawm segmented appendages. Cov appendages no txuas nrog prosoma. Thawj khub ntawm appendages yog hu ua chelicerae, uas yog siv los tswj thiab kis zaub mov rau hauv lub qhov ncauj. Ob khub yog hu ua pedipalp, uas yog siv los ntes zaub mov. Plaub khub kawg ua raws li ob txhais ceg. Arachnids tsis muaj mandibles thiab kav hlau txais xov tsis zoo li lwm yam arthropods zoo li kab. Feem ntau cov arachnids yog cov av, thiab ob peb yog cov dej hauv dej. Phau ntawv ntsws los yog trachea yog siv los ua cov kab mob ua pa.
Crustaceans yog dab tsi?
Crustaceans yog cov arthropods nrog ob lub cev faib, hu ua cephalothorax thiab plab. Muaj cov ntaub thaiv npog zoo li lub cev los qhwv lub cephalothorax, yog li hu ua crustaceans. Crustaceans muaj biramous appendages uas cov ntu yog branched, thiab txhua ceg muaj ib tug series ntawm ntu. Cov appendages muaj nyob rau txhua ntu ntawm lub cev. Cephalothorax muaj ob khub ntawm kav hlau txais xov, ib khub ntawm mandibles, thiab ob khub ntawm maxillae. Tag nrho cov crustaceans tsuas yog dej thiab pom nyob rau hauv ob qho tib si dej qab zib thiab dej ntsev. Cov qauv piv txwv rau crustaceans muaj xws li prawns, lobsters, shrimps, barnacles, thiab crabs.
Nyob ntawm tus lobster
Qhov txawv ntawm Arachnids thiab Crustaceans yog dab tsi?
• Arachnids muaj prosoma (cephalothorax) thiab opisthosoma (mob plab) nrog rau 6 khub ntawm segmented appendages, whereas crustaceans muaj cephalothorax thiab plab. Cov appendages ntawm crustaceans muaj nyob rau hauv txhua ntu.
• Tsis zoo li crustaceans, arachnids tsis muaj antennae thiab mandibles.
• Feem ntau cov arachnids yog cov av, thiab ob peb yog cov dej hauv ob, hos crustaceans tsuas yog dej xwb.
• Piv txwv rau arachnids muaj xws li scorpions, kab laug sab, mites, thiab zuam. Piv txwv ntawm crustaceans yog prawns, lobsters, shrimps, barnacles, thiab crabs.
• Cov kab mob ua pa ntawm arachnids yog phau ntawv ntsws lossis lub ntsws, qhov ntawm cov crustaceans yog gills.
• Tsis zoo li arachnids, crustaceans muaj stalked compound ob lub qhov muag.
• Crustaceans muaj carapace, tab sis arachnids tsis.
