Home > Invertebrates > Sea Urchins > Heterocentrotus mamillatus

Updated 2/6/2016

Family Echinometridae

HAWAII

Heterocentrotus mamillatus

Slate Pencil Urchin, Blowhole, 10 feet, 50mm

Blowhole, Oahu, Hawaii, 20 feet

Sea Cave, Oahu, 45 feet

 

Palea Point, Oahu, Hawaii, 25 feet

 

Lanai Lookout, Oahu, 35 feet

Kailua Bay, Hawaii, 20 feet

 

Kapoho tidepool, Hawaii

 

Ahihi Bay, Maui, 4 feet

 

Honokohau, Hawaii, 10 feet

 

Molokini Back Wall, 30 feet

 

Makapu'u, Oahu, 20 feet

 

Juvenile, Makapu'u, Oahu, 15 feet

Sea Cave, Oahu, 45 feet

 

Night, Lana'i Lookout, Oahu, 15 feet



Hanauma Bay, Oahu, 25 feet



Blowhole, Oahu, Hawaii, 20 feet
 

SLATE PENCIL URCHIN

Locally abundant in clear shallow water.  Rare outside the Hawaiian Islands.  Spine shape variable.  Pale brown with light bands at night.  Overall diameter of 10 inches.  Hawaii & the Indo-Pacific.  The species name has long been spelled with two 'm's in the middle but only one 'm' is correct:  http://www.marinespecies.org/aphia.php?p=taxdetails&id=568045