Qhov txawv ntawm crustaceans thiab molluscs yog tias crustaceans muaj segmented lub cev thaum molluscs muaj unsegmented mos lub cev.
Kingdom Animalia yog pawg tsiaj loj. Tag nrho cov tsiaj hauv lub nceeg vaj Animalia yog eukaryotes thiab multicellular heterotrophs, thiab feem ntau ntawm lawv tuaj yeem txav mus los. Ntxiv mus, lub nceeg vaj Animalia kuj muaj ntau yam phyla. Ntawm lawv, phylum Arthropoda suav nrog tag nrho cov kab thaum phylum Mollusca suav nrog cov tsiaj txhu hauv av thiab cov dej tsis huv uas muaj lub cev mos uas npog nrog lub cev (plhaub). Phylum Arthropoda thiab Phylum Mollusca yog cov pab pawg sib txawv loj tshaj plaws nrog ntau hom tsiaj hauv Animalia lub nceeg vaj. Crustaceans yog ib tug taxon ntawm phylum Arthropoda. Ib yam li ntawd, tsab xov xwm no qhia txog cov yam ntxwv ntawm txhua tus phylum thiab yog li sim piav qhia qhov txawv ntawm crustaceans thiab molluscs (mollusks).
Crustaceans yog dab tsi?
Taxon crustacea tuaj nyob rau hauv phylum arthropods thiab muaj 35,000 hom. Cov yam ntxwv tshwj xeeb ntawm arthropods yog qhov muaj qhov sib koom ua ke, tawv chitinous exoskeleton, ob lub qhov muag, thiab endocrine system. Yog li, tag nrho lub cev ntawm crustaceans muaj ob qhov tseem ceeb; plab thiab cephalothorax (Cephalon thiab thorax fused tsim ib cephalothorax). Shield zoo li carapace kaw lub cephalothorax. Ntxiv mus, cov tsiaj no muaj peb khub appendages li qhov ncauj qhov ncauj, ob khub ntawm cov kav hlau txais xov, thiab ob peb ob txhais ceg. Tsis tas li ntawd, lawv tus lej ntawm ob txhais ceg sib txawv ntawm cov hom.
Qhov tshwj xeeb ntawm crustaceans yog qhov muaj ob khub ntawm cov kav hlau txais xov uas tsis muaj nyob hauv lwm cov arthropods. Tsis tas li ntawd, tag nrho cov segmented appendages (tshwj tsis yog thawj khub ntawm cov kav hlau txais xov) ntawm crustaceans yog biramous thiab tam sim no nyob rau hauv tag nrho lub cev ntu. Feem ntau, tag nrho cov crustaceans yog cov dej loj thiab tuaj yeem pom nyob rau hauv ob qho tib si marine thiab dej tshiab. Marine crustaceans yog crabs, cws, lobsters thiab barnacles thaum dej tshiab crustaceans suav nrog qee cov crayfish, crabs thiab copepods. Ob peb hom yog terrestrial (piv txwv li, pillbugs), thiab qee hom yog semi-terrestrial (piv txwv li, xuab zeb fleas lossis puam fleas).
Daim duab 01: Crustacean
Tsis tas li ntawd, planktonic crustaceans zoo li krill thiab larval crustaceans ua cov khoom noj tseem ceeb hauv marine ecosystems. Qee cov crustaceans zoo li lobsters thiab crayfish yog qhov tseem ceeb ua zaub mov rau tib neeg. Hauv cov crustaceans loj dua, feathery gills ua raws li cov kab mob ua pa, thaum nyob hauv cov crustaceans me, cov pa pauv hloov pauv los ntawm lawv cov cuticle. Cov yam ntxwv larval daim ntawv ntawm crustacean yog hu ua 'nauplius'.
Molluscs (Mollusks) yog dab tsi?
Phylum Mollusca yog pawg thib ob loj tshaj plaws thiab muaj ntau haiv neeg nrog ntau dua 110,000 hom kab mob hauv tebchaws Animalia. Molluscs nyob hauv ntau hom ib puag ncig nrog rau ob qho tib si hauv dej thiab av ecosystems. Tsis tas li ntawd, pawg no suav nrog qwj, slugs, scallops, clams, octopuses, cuttlefish, oysters, thiab lwm yam. Lub cev loj ntawm molluscs txawv ntawm microscopic mus rau loj. Piv txwv li, cov molluscs loj tshaj plaws yog cov squid loj heev nrog lub cev loj ntawm 15 m ntev thiab hnyav txog li 250 kg.
Daim duab 02: Molluscs
Molluscs muaj lub cev tsis muaj segmented. Cov yam ntxwv feature ntawm tag nrho cov molluscs yog lub xub ntiag ntawm mantle; ib tug tuab epidermis, uas npog lub dorsal sab ntawm lub cev. Qee cov molluscs muaj cov plhaub calcareous sab nraud, uas yog secreted los ntawm lub mantle. Tag nrho cov molluscs tshwj tsis yog cephalopods muaj cov leeg taw ua lub cev ntawm locomotion. Tsis tas li rau kev txav mus los, cov leeg pob txha ua haujlwm ntau yam xws li kev sib txuas, khoom noj khoom haus, khawb, thiab lwm yam. Tag nrho cov kabmob xws li excretory, digestive thiab reproductive organs muaj nyob rau hauv visceral loj. Trochophore thiab veliger larval forms yog cov yam ntxwv rau molluscs. Qee cov molluscs xws li oysters, clams, scallops, mussels, octopuses, thiab squids yog cov khoom noj tseem ceeb ntawm tib neeg.
Dab tsi yog qhov zoo sib xws ntawm Crustaceans thiab Molluscs?
- Crustaceans thiab molluscs yog tsiaj uas zwm rau lub nceeg vaj Animalia.
- Ob leeg yog cov khoom noj tseem ceeb ntawm tib neeg.
- Tsis tas li, ob pab pawg muaj cov tswv cuab hauv dej thiab av.
- Tsis tas li ntawd, lawv yog cov invertebrates.
- Thiab, ob pab pawg suav nrog marine thiab dej tshiab
- Dhau li ntawd, lawv muaj ib qho exoskeleton.
Qhov txawv ntawm Crustaceans thiab Molluscs yog dab tsi?
Crustaceans thiab molluscs yog ob pawg tsiaj sib txawv. Crustaceans yog ib tug taxon ntawm phylum arthropods thaum Mollusca yog ib tug loj phylum. Crustaceans yog kab uas muaj segmented lub cev. Ntawm qhov tod tes, molluscs muaj lub cev mos uas yog unsegmented. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm crustaceans thiab molluscs. Tsis tas li ntawd, crustaceans muaj chitinous exoskeleton, thaum qee cov molluscs muaj calcareous plhaub. Li no, qhov no kuj yog qhov txawv ntawm crustaceans thiab molluscs.
Ntxiv mus, qhov sib txawv ntxiv ntawm crustaceans thiab molluscs yog tias cov crustaceans muaj segmented biramous appendages uas tsis muaj nyob rau hauv molluscs. Tsis tas li ntawd, qhov sib txawv tseem ceeb ntawm crustaceans thiab molluscs yog tias, hauv crustaceans, lub cev tau muab faib ua ob ntu; cephalothorax thiab plab. Txawm li cas los xij, tsis muaj qhov sib faib zoo li no hauv molluscs. Tsis tas li ntawd, molluscs muaj cov leeg leeg rau ntau yam dej num, tsis zoo li crustaceans. Li no, nws yog qhov sib txawv ntawm cov crustaceans thiab molluscs.
Dhau li ntawd, mollusca muaj ntau dua 110,000 hom, whereas crustacea muaj txog 35,000 hom hom. Cov yam ntxwv larval daim ntawv ntawm crustacean yog hu ua 'nauplius', whereas ntawm molluscs yog trochophore. Yog li ntawd, qhov no yog ib qho txawv ntawm crustaceans thiab molluscs.
Summary – Crustaceans vs Molluscs
Nyob rau hauv cov ntsiab lus ntawm qhov sib txawv ntawm crustaceans thiab molluscs; cov crustaceans yog ib tug taxon uas belongs rau phylum arthropods ntawm lub nceeg vaj Animalia. Tag nrho cov crustaceans yog kab nrog segmented lub cev. Ntawm qhov tod tes, Mollusca yog lwm lub cev ntawm lub nceeg vaj Animalia uas suav nrog cov dej thiab cov tsiaj txhu hauv av uas muaj lub cev mos mos. Qhov no yog qhov sib txawv tseem ceeb ntawm crustaceans thiab molluscs. Tsis tas li ntawd, crustaceans muaj chitinous exoskeletons thaum molluscs muaj calcareous exoskeletons. Ntxiv mus, crustaceans muaj biramous appendages thaum molluscs tsis muaj.
