Mollusks

Zoo Siab

• Hom mollusks
• Morphology
• Pub mis
• Nyob
• Piv txwv ntawm mollusks

Mollusks yog cov tsiaj txhu tsis muaj tus yam ntxwv uas muaj lub cev muag muag nrog cov leeg nqaij taw npog los ntawm calcium-raws li exoskeleton lossis lub plhaub. Feem ntau lawv yog tsiaj txhu.

Hom mollusks

Muaj peb chav kawm sib txawv lossis hom mollusks:

• Gastropods. Qwj thiab slugs. Kwv yees li 80% ntawm mollusks yog ntawm chav kawm no.
• Cephalopods. Octopus, squid thiab cuttlefish. Nws yog pawg tsawg tsawg tab sis hloov pauv ntau dua.
• Vivalves. Nyob rau hauv pab pawg no yog clams, mussels thiab oysters. Cov yam ntxwv ntawm pab pawg no yog tias lawv tsuas yog ib ntawm ntawm peb lub hauv paus uas tsis muaj radula. Clams, qwj nplais thiab oysters. Lawv tsuas yog cov uas tsis muaj radula.

Morphology

• Kev ua pa. Feem ntau cov mollusks ua pa los ntawm cov pos hniav, txawm hais tias qee hom tsiaj tau tsim kab mob ua pa.
• Digestive system. Mollusks pub los ntawm lub cev hu ua radula uas zoo li tus nplaig. Kuj tseem hu ua mantle, lub cev no npog cov visceral loj thiab hauv qee hom tsiaj zais cov calcium carbonate los ua lub plhaub.
• Circulatory system. Lawv muaj lub plawv, aorta, thiab cov hlab ntshav.
• Kev ua me nyuam. Mollusks yog oviparous, uas yog, lawv tsim los ntawm kev tso qe los ntawm poj niam. Lawv tus cwj pwm yog nyob ib leeg, nws tsis nquag pom lawv hauv pab pawg, tshwj tsis yog thaum lawv sib yuav. Ntau cov mollusks yog hermaphrodites.

Pub mis

Hom pub mis ntawm mollusks txawv raws li txhua hom. Feem ntau, av mollusks yog herbivores, thaum dej mollusks yog carnivores, txawm hais tias lawv kuj pib lawv cov zaub mov ntawm plankton thiab algae.

Nyob

Hauv kev cuam tshuam nrog lawv qhov chaw nyob, mollusks tuaj yeem nyob hauv qab dej, hauv qab hiav txwv (lawv suav txog 23% ntawm tag nrho cov tsiaj hiav txwv thiab dej hiav txwv), tab sis lawv kuj tseem tuaj yeem siv thiab nyob 3,000 meters saum toj siab hiav txwv ntawm thaj av.

Piv txwv ntawm mollusks