Invertebrate Anatomy

Which phylum is characterized by a bilaterally symmetrical body, a simple body cavity, and a digestive system tube running through the length of the body?

Which phylum is characterized by a true coelom that increases complexity and specialization of internal organs?

Which phylum is characterized by segmented worms, with segments that increase mobility and redundancy in body sections?

Which group of vertebrates has a bony and cartilaginous skeleton, jaws, paired appendages (fins), and scales?

Which group of vertebrates has legs (tetrapods), moist skin, lungs and diffusion through skin for gas exchange, and undergoes metamorphosis from tadpole to adult?

Which group of vertebrates has dry skin, scales, armor, lungs for gas exchange, and undergoes internal fertilization and external development in an amniotic egg?

Key Phyla and Their Characteristics

Bilaterally symmetrical body with a simple body cavity and a digestive system running the length of the body is characteristic of Phylum Platyhelminthes (flatworms).
Phylum Annelida is defined by a true coelom, allowing for greater complexity and specialization of internal organs.
Phylum Annelida also includes segmented worms, where segmentation enhances mobility and provides redundancy in body sections.

Vertebrate Groups and Their Features

Cartilaginous and bony fishes, belonging to the groups Chondrichthyes (cartilaginous) and Osteichthyes (bony), have a skeleton made of either cartilage or bone, jaws, paired appendages (fins), and scales.
Amphibians, a group of tetrapods, feature legs, moist skin, lungs for gas exchange, and go through metamorphosis from a tadpole to an adult form, typically exhibiting a dual life cycle (aquatic and terrestrial).
Reptiles, characterized by dry skin covered in scales, possess lungs for gas exchange and undergo internal fertilization. They lay eggs which have an amniotic structure, allowing for development in a terrestrial environment.

Test your knowledge of invertebrate anatomy with this quiz! Learn about the unique characteristics of Nematoda (roundworms) and Mollusca (mollusks) including body structure, digestive systems, and more. Challenge yourself and become an expert in these fascinating invertebrate organisms.