Ch 26 Animal Evolution and Diversity

The Ediacaran Fauna dates back to __ MYA and is thought to be related to jellyfishes and worms.

565 – 544 MYA

The __ is known for the emergence of complex body plans and specialized cells during the Cambrian Period.

Cambrian Explosion

The phylum __ includes sponges, which are characterized by their porous bodies and lack of true tissues.

Porifera

Animals that have __ body parts are said to exhibit a higher level of complexity in their body organization.

specialized

Chordates and echinoderms are believed to share a common ancestor, indicating that the earliest chordates were most likely related to __.

echinoderms

The class __ includes jawless fishes such as lampreys and hagfish, which lack vertebrae.

Agnatha

Reptiles, such as lizards and snakes, are characterized by dry, scaly skin and __ eggs that do not develop in water.

shelled

Mammals are characterized by having __ glands in females, which are responsible for milk production.

mammary

The first birdlike fossil, __, dates back to the Jurassic Period and is about 150 MYA.

Archaeopteryx

Primitive primates such as lemurs and lorises are primarily __ and are known for their large eyes and long snouts.

nocturnal