Cetacea suav nrog ntau hom tsiaj hauv hiav txwv, uas tau muab faib ua ob pawg loj, mysticetes, uas muaj hwj txwv, thiab odontocetes, uas muaj cov hniav. Nyob rau yav tas los, muaj ntau tsev neeg uas cov tsiaj sib txawv uas feem ntau hu ua dolphins nyob, uas feem ntau sawv tawm rau lawv txoj kev sib raug zoo, txawm tias nrog tib neeg, thiab kev sib txuas lus zoo. Cov cwj pwm no tau ua rau cov tsiaj no suav tias yog cov neeg txawj ntse, vim lawv tus cwj pwm txawv. Hauv tsab xov xwm no ntawm peb lub xaib peb xav nthuav qhia txog hom ntses taub ntswg ntev thiab lawv cov npe. Yog li thov caw nej los nyeem ntxiv.
Hmoob Delphinidae
Tsev neeg no yog tsim los ntawm cov tsiaj uas feem ntau hu ua dolphins, tab sis kuj ntawm ib co hu ua toothed whales, ntawm cov killer whales pom.
Cov yam ntxwv ntawm cov ntses taub ntswg ntev no yog:
- Lawv ua ib pawg neeg sib txawv, uas ua rau lawv tsev neeg loj tshaj plaws ntawm cetaceans. Yog tias koj xav paub ntau ntxiv txog Cetaceans: lub ntsiab lus, hom thiab cov yam ntxwv, tsis txhob yig mus sab laj cov ntawv no uas peb pom zoo.
- Lawv qhov ntau thiab tsawg sib txawv from 1.5 to10 meters.
- Lawv muaj qhov hnyav ntau nraug 50 thiab 7,000 kg.
- txiv neej loj dua
- Txawm hais tias lawv txhua tus muaj cov qauv hu ua melon, ua los ntawm cov ntaub so ntswg adipose thiab siv rau kev sib txuas lus thiab echolocation, hauv qee qhov hauv pliaj sawv ua tsaug rau lub cev no.
- Lub cev yog torpedo-shaped and streamlined.
- Lawv feem ntau muaj xim ntau dua lossis tsawg dua.
- Lawv muaj tus cwj pwm exclusively marine.
NOJ NTXHAIS MUAJ TSEG MUAJ TSIM NYOG Teb Long Syout
Tam SimTam Sim No Tsis Txhob Yuav Tsum Muaj Ntses.
Cov ntses taub ntswg ntev ntawm tsev neeg Delphinidae thiab lawv txoj kev txuag
Qee yam ntawm cov ntses taub ntswg ntev thiab lawv cov npe uas ua rau tsev neeg Delphinidae yog cov hauv qab no. Ntxiv thiab, peb kuj hais txog kev txuag ntawm txhua hom ntses taub ntswg ntev uas muaj.
- Risso's dolphin (Gramus griseus): kev txhawj xeeb tsawg kawg.
- Common Dolphin (Delphinus capensis): tsawg kawg kev txhawj xeeb.
- Spinner dolphin (Stenella longirostris): tsawg kawg kev txhawj xeeb.
- Fraser's dolphin (Lagenodelphis hosei): kev txhawj xeeb tsawg.
- Common Bottlenose Dolphin (Tursiops truncatus): Kev txhawj xeeb tsawg.
- dolphin Southern (Lagenorhynchus australis): tsawg kawg kev txhawj xeeb.
- Chilean dolphin (Cephalorhynchus eutropia): ze hem.
- Atlantic Humpback Dolphin (Sousa teuszii): Critical endangered.
- Australian short-nosed dolphin (Orcaella heinsohni): vulnerable.
- Rough-toothed dolphin (Steno bredanensis): tsawg kawg kev txhawj xeeb.
Tsev Neeg Iniidae
Tsev neeg no muaj qee qhov kev tsis sib haum xeeb, txawm li cas los xij, peb raug coj los ntawm qhov tau teev tseg hauv International Union for Conservation of Nature [1] and the Integrated Taxonomic Classification System [2], qhov twg ib tug genus raug lees paub, nrog ib hom, lub paj ntses taub ntswg ntev los ntawm Amazon River(Inia geoffrensis) thiab ob hom: Kuv. g. boliviensis thiab kuv. g. geoffrensis kev. Nws raug cais nyob rau hauv qeb uas muaj kev puas tsuaj.
Ntawm cov yam ntxwv ntawm hom peb pom:
- Inhabits freshwater ecosystems, ntawm Amazon thiab Orinoco dej phwj.
- Nws yog qhov loj tshaj plaws ntawm cov ntses taub ntswg ntev, ncav qhov ntev ntawm ib ncig ntawm 2.5 meters thiab hnyav txog 210 kg.
- Presenta cim poj niam txiv neej dimorphism, qhov tseeb, ib qho ntawm cov pov thawj tshaj plaws ntawm cetaceans, txij li cov txiv neej loj dua.
- Thaum hluas lawv grey tsaus, tab sis thaum lawv muaj hnub nyoog lawv tig liab qab, txiv neej muaj ntxoov ntxoo tob.
- Nws pub ntses ntau yam.
tsis txhob ua siab deb mus saib ntawm tsab xov xwm no rau lub hnub nyoog Amazon liab Dolphin: Ntawm no.
Family Lipotidae
Nyob hauv tsev neeg dolphins no muaj ib hom neeg hu ua feem ntau yog Baiji (Lipotes vexillifer) thiab yog hom ntses taub ntswg ntev kab mob mus rau Suav teb Hmoov tsis zoo cov hom no raug cais tawm critically endangered (tej zaum yuav ploj mus), txij li qhov kawg raug pom Daim ntawv tshaj tawm yog xyoo 2002. Ntawm cov yam ntxwv ntawm cov ntses taub ntswg ntev no peb pom tias:
- Lub cev yog
- Nws muaj snout elongated.
- Xov xwm yog bluish grey nrog lub white plab.
- 170 kgs .
- Length varies of 1,40 and 2,50 meters kwv yees.
- Nws cov zaub mov feem ntau yog noj ntses.
Family Platanistidae
Ntawm no yog ib tsev neeg uas sib raug rau ib hom ntses taub ntswg ntev. Taxonomically nws muaj ib tug genus, ib hom, hu ua lub South Asian dej ntses taub ntswg ntev (Platanista gangetica), thiab ob subspecies: P.g. gangetica thiab P. g. me me. Nws suav hais tias yog endangered
Lawv cov yam ntxwv tseem ceeb ntawm cov ntses taub ntswg ntev yog:
- Nws qhov tseem ceeb yog nws ntev snout, uas tuaj yeem ncav cuag 20% ntawm tag nrho lub cev size. Nws ntsuas txog li 21 cm, yog tus tiaj tus, flares tawm ntawm lub ntsis thiab nkhaus me ntsis.
- ZAUB MOV.
- Nws muaj 70 los yog ntau dua cov hniav, uas pom tau txawm tias thaum nws lub qhov ncauj kaw.
- Lawv yog grey mus rau xim av, dorsally tsaus dua lub plab, thiab tej zaum yuav muaj ib tug liab qab underparts.
- Lawv hnyav ntawm 50 mus rau 90 kg thiab muaj ntau qhov ntev ntawm 2 mus rau 4 meters long.
- Lawv yog cov nqaij tawv nruj, qhov tseeb, cov tsiaj nyeg tseem ceeb hauv lawv thaj chaw, lawv feem ntau haus ntses, tab sis kuj muaj crustaceans thiab molluscs.
NIAM UA NOJ, MUAJLAGE BEAK
Tsev Neeg Pontoporiidae
Corresponds to a type of dolphin hu ua La Plata dolphin or Franciscana (Pontoporia blainvillei). Nws yog ib hom kab mob endemic ntawm Argentina, Brazil thiab Uruguay, nws tau muab cais as vulnerable Ntawm nws cov yam ntxwv tseem ceeb peb tuaj yeem hais:
- Nws snout ntev thiab me ntsis nqaim.
- Lawv yog size me dua lwm tus hom ntses taub ntswg ntev, ntsuas ntawm 0, 7 txog 1, 7 metres
- Hais lawv lub cev hnyav los ntawm 25 txog 32 kg.
- txiv neej me dua poj niam.
- Nws muaj ib qho kev loj hlob siab tshaj plaws ntawm cetaceans, qhov no yog ib qho tshwj xeeb ntawm cov poj niam.
- Dorsally lawv tuaj yeem yog xim av mus rau grey, thaum ventrally lub xim yog sib dua.
- Nws cov zaub mov yog tshwj xeeb hauv cov ntses thiab cov dej tsis huv. Yog tias koj txaus siab rau Kev faib tawm ntawm cov tsiaj tsis muaj zog, tsis txhob ua siab deb nyeem tsab xov xwm no ntawm peb qhov chaw uas peb pom zoo.
- Inhabits coastal marine ecosystems nrog pos huab los yog dej ntshiab, thiab thaum kawg hauv estuaries.
Ntau hom ntses taub ntswg ntev tau ntes tau thiab raug kev cob qhia los nthuav qhia hauv cov chaw ua si thiab cov vaj tsiaj. Cov no yog cov tsiaj qus, yog li tshwj tsis yog lawv raug cawm kom rov qab los ntawm qee hom kev sib tsoo lawv tau raug kev txom nyem, lawv yuav tsum nyob hauv lawv qhov chaw nyob. Los ntawm peb qhov chaw peb caw koj tsis txhob tuaj koom qhov chaw uas cov tsiaj no khaws cia rau kev lom zem.
