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Arthropods are the most diverse group of organisms on our planet and the tropical rainforests represent the most biologically diverse of all ecosystems.
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.
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.
An overview of morphological features of the different Classes of arthropods and Orders of insects, with photos of Italian arthropods by Alessandro Strano.
The Phylogenetic Status of Arthropods, as Inferred from 18S rRNA Sequences J. McClintock Turbeville, David A4. Pfeifer, 2 Katharine G. Field, 3 and Rudolf A. Rafl Institute for Molecular and Cellular Biology and Department of Biology, Indiana University Partial 18s rRNA sequences of five
muscle, Arthropods: Arthropoda is the largest phylum of invertebrate animals and comprises the crustaceans, insects, arachnids (spiders and scorpions), and other classes. Some arthropods have soft-bodied young stages in which the principle of the hydrostatic skeleton is important. Most adult
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.