Protostomia

Table of Contents

Introduction References & Edit History Related Topics

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Malayan Leaf Frog - Megophrys nasuta

9 Animals That Look Like Leaves

Big beaver gnawing on limb at river's edge

6 Animal Species that Mate for Life

coconut octopus underwater, amphioctopus, cephalopod, indonesia

6 Reasons to Love Cephalopods

Aedes aegypti mosquito, a carrier of yellow fever, dengue, and dengue hemorrhagic fever.

10 Questions About Insects Answered

Praying mantis (sphodromantis gastrica)

Why Do Some Animals Eat Their Mates After Sex?

Discover

Statue of Nostradamus

Nostradamus and His Prophecies

Ahura Mazda - relief of the Zoroastrian god Ahura Mazda at the ancient ruins of Persepolis in Iran. Also known as Ormazd Zoroastrianism,

Which Religion Is the Oldest?

Aphrodite. Greek mythology. Sculpture. Aphrodite is the Greek goddess of love and beauty.

12 Greek Gods and Goddesses

Groups of depositors in front of the closed American Union Bank, New York City. April 26, 1932. Great Depression run on bank crowd

Causes of the Great Depression

Lusitania sinking, illustration from The War of the Nations (New York), December 31, 1919. World War I, WWI. This image is one of three on the page. (See source file for the other two.)

7 of the World’s Deadliest Shipwrecks

American bison (Bison bison) also known as buffalo or plains buffalo on the prairie, western U.S.

What’s the Difference Between Bison and Buffalo?

The Colosseum, Rome, Italy. Giant amphitheatre built in Rome under the Flavian emperors. (ancient architecture; architectural ruins)

New Seven Wonders of the World

Protostomia: Related Content

Written and fact-checked by The Information Architects of Encyclopaedia Britannica

Topics

annelid arthropod mollusk schizocoelomate invertebrate coelomate mesozoan macroinvertebrate shellfish worm protochordate Deuterostomia enterocoelomate lophophorate echinoderm sponge

Quiz

vulture. An adult bearded vulture at a raptor recovery center. The Gypaetus barbatus also known as the Lammergeier or Lammergeyer, is a bird of prey and considered an Old World vulture.

Animal Factoids

Sea otter (Enhydra lutris), also called great sea otter, rare, completely marine otter of the northern Pacific, usually found in kelp beds. Floats on back. Looks like sea otter laughing. saltwater otters

Animal Group Names

Mute swan with cygnet. (birds)

Match the Baby Animal to Its Mama Quiz

Lion (panthera leo)

Deadliest Animals Quiz