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Claws and anemones may help with defense. - Must acquire larger shell as grow. Exhibit elaborate shell switching behavior, and may kill and eat snail to get shell.
Arthropods are the most successful group of animals. Their success is measured by having the most species, producing the greatest numbers of offspring, occupying the most habitats, possessing terrific defenses, and being able to exploit new resources.
An overview of morphological features of the different Classes of arthropods and Orders of insects, with photos of Italian arthropods by Alessandro Strano.
Description: Phylum Arthropoda, also referred to as Anthropods, is the largest phylum in Kingdom Animalia. There are over 1 million classified species of Arthropods. Even more astonishing is the estimated 50 million unknown species that exist today.
The best known arthropods are the myriad terrestrial insects we encounter every day. Many marine arthropods can be found in our tidepools, though some of these arthropods are barely recognizable as belonging to the phylum.
A variety of marine worms (Annelida and Protoannelida) lived in the ocean sediments during the Cambrian period. These creatures were bilaterally symmetrical, soft-bodied, and multisegmented. They had no distinct head capsule and lacked both eyes and antennae.
Phylogenetic analysis of arthropods using two nuclear protein-encoding genes supports a crustacean + hexapod clade Je¡rey W. Shultz1* and Jerome C. Regier2 1Department of Entomology, University of Maryland, College Park, MD 20742, USA ( js314@umail.umd.