Why are animals like a snail a clam and a squid which all lo

Why are animals like a snail, a clam and a squid, which all look very different, considered to be in the same phylum?

Solution

Animals of same phyla share maximum common characteristics of their reproductive, digestive, or nutrition, locomotion, habitat, morphology, body symmetry and other characters. Those characteristics evaluate with score on matching and animals of maximum resemblance score take under the same phyla. A new criterion is also use to set phyla, on the basis of genetic equality.