slate-pencil urchin

Directory

References

Images

Slate-pencil urchin (Heterocentrotus mammillatus)

Discover

Secret Service Agent Listens To Earpiece

Secret Service Code Names of 11 U.S. Presidents

United States elections portal page linking to each election interactive

A History of U.S. Presidential Elections in Maps

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

Andrew Jackson delivering a speech while on his way to Washington, D.C., for his inauguration in 1829. From Harper's Weekly, 1881.

5 Remarkably Close U.S. Presidential Elections

An ancient egyptian hieroglyphic painted carving showing the falcon headed god Horus seated on a throne and holding a golden fly whisk. Before him are the Pharoah Seti and the goddess Isis. Interior wall of the temple to Osiris at Abydos, Egypt.

11 Egyptian Gods and Goddesses

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

12 Greek Gods and Goddesses

Globe South America, map

What’s the Difference Between Hispanic and Latino?

slate-pencil urchin

invertebrate

Also known as: Heterocentrotus mammillatus

Learn about this topic in these articles:

description

In sea urchin
The slate-pencil urchin (Heterocentrotus mammillatus) of the Indo-Pacific has 12-cm spines that may be 1 cm thick—stout enough to be used for writing. Lytechinus variegatus, a pale-greenish urchin of the southeastern coast of the United States and the Caribbean, and the large, short-spined Psammechinus (sometimes Echinus)…
Read More