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Class Insecta of this phylum __________ & subphylum Hexapoda (having six legs) is the most diverse of all the arthropod groups.

Arthropoda

Sponges part of this phylum are the least complex of all animals. They are asymmetrical organisms that lack tissues, organs, nerves and muscles.

Porifera

Cephalopoda ("head foot”) is part of this phylum & perhaps the most intelligent members of all the invertebrate phyla.

Molluska

There are six classes of this phylum Echinodermata: Asteroidea, Ophiuroidea, Echinoidea, Crinoidea, Holothuroidea, and Concentricycloidea.

Echinodermata

Members of this phylum are completely covered by a cuticle, an exoskeleton made up of layers of protein and chitin.

Arthropoda

Chitons of this phylum, have a very distinctive shell made up of a series of eight overlapping and articulating plates covering the dorsal, or back, surface.

Molluska

Members of this phylum are constructed with a classical coelomate body plan, a tubular-shaped gut running through the middle of a coelom.

Annelida

Members of this phylum are capable of locomotion using true muscle tissue and are the most primitive organisms with a central nervous system.

Platyhelminthes "flatworms"

Members of this phylum come in two variations: the sessile polyp and the floating medusa.

Cnidarians

This phylum generates a current that brings water inward through incurrent pores and outward through the excurrent opening called the osculum.

Porifera

Individuals of what phylum can be found in most aquatic habitats, in wet soil, in the moist tissue of plants, and in the body fluids and tissues of animals.

Nematoda "roundworms"