The presence of he shell, the type of shell, the type of foot, and the type of nervous system
the 8 groups of invertebrates are the arthropods, poriferans, platyheminthes, coelenterates, nematoeds, mollusks, echinoderms, and annelids
There are three main classes of mollusks: Gastropoda (snails and slugs), Bivalvia (clams, mussels, oysters), and Cephalopoda (octopuses, squids, nautiluses). Each class has unique characteristics and habitats.
Soft bodies
Bivalve mollusks
Minibeasts, or small invertebrates, can be categorized into three main groups: insects, arachnids, and mollusks. Insects, such as butterflies and ants, have three body segments and six legs. Arachnids, including spiders and scorpions, typically have eight legs and two main body segments. Mollusks, like snails and slugs, are characterized by soft bodies and often have a hard shell.
Their foot
Mollusks are divided into three main groups based on certain characteristics. The three main groups of common mollusks are snails, slugs, and their relatives; Two-shelled mollusks; and tentacled mollusks.
sponges+mollusks+arthropods+worms+octopods+echinoderms
Flatworms, Roundworms, Annelids, Mollusks, and Arthropods
UnivalvesBivalvesCephalopods
snail squid octopos
The three primary characteristics of mollusks are a mantle with a cavity for breathing and excretion, a radula, and the structure of the nervous system. Squid and other cephalopods have all of these characteristics.