Mollusca

Mollusca (Mollusca) yog cov lus siv dav dav rau txhua hom Cephalopoda (Cephalopoda), muaj txog 650 hom, tag nrho cov nqaij nruab deg, xws li pos i hws, cuttlefish, nautilus, squid, etc. Los ntawm nyob ze rau ntawm ntug dej mus rau hiav txwv deb, txij saum npoo mus rau qhov tob hauv qab 4,500 meters.

Tsawg-salinity dej yog tsawg. Baltic cov dej muaj cov ntsev tsawg thiab tsis muaj cephalopods, tab sis Suez Canal muaj lawv. Muaj ntau cov tsiaj tsis paub tab tshaj cov tsiaj uas twb muaj lawm, muaj peaking kawg ntawm Paleozoic thiab Mesozoic, qhov zoo tshaj plaws paub xws li ammonites thiab pob zeb xub. Cephalopods thiab gastropods yog kev txheeb ze.