Green Sea Urchin

by David Young | Aug 1, 2024 | Echinoderms

Author:  Martina Sarra Video and photos by Lucinda Booth and D. Young Scientific Name:  Strongylocentrotus droebachiensis Size Range:the average adult size is 50 mm (2 in), but it has been recorded at a diameter of 87 mm (3.4 in).  Of the three species of sea urchin...

Purple Sea Urchin

by David Young | Aug 1, 2024 | Echinoderms

Authors: Emma Grigg & Nastja Kharine Scientific Name: Strongylocentrotus purpuratus Size range: normally grows to 10cm (4 inches) but may be as large as 15 cm (6 inches)   Identifying Features:  As in its name, the purple sea urchin is a dark purple but it...

Red Sea Urchin

by David Young | Jul 31, 2024 | Echinoderms

Red Sea Urchin By Victoria Cholak Common name:  Red Sea Urchin, Giant Red Urchin Scientific name:  Mesocentrotus  franciscanus (formerly Strongylocentrotus franciscanus) Size range: Its test can be up to 17 cm (6½ inches) wide and its spines up to 7.6 cm (3 inches)...

Pacific Sand Dollar

by David Young | Jul 30, 2024 | Echinoderms

Sand Dollar Author:  Molly Simpson and Emma Troost Scientific Name:  Dendraster excentricus Size Range:  Up to 10cm in diameter Identifying Features:  Sand dollars have no front, back, head or tail; instead they have a bottom (oral side) and a top (aboral side). They...