Common name: Sea Urchins

Echinoidea, commonly known as sea urchins, are a class of echinoderms characterized by their spiny globular bodies. They play a vital role in marine ecosystems and are known for their grazing habits, which help control algae growth on reefs. In the aquarium, they can be beneficial for algae control, but their spines can be harmful to soft-bodied tank mates. Some popular species for reef tanks include the tuxedo urchin and the pencil urchin. It's important to provide ample rockwork and hiding places for these invertebrates.

1. 
   Common name: Fire Urchin

   Scientific name: Asthenosoma ijimai
2. 
   Common name: variable fire urchin

   Scientific name: Asthenosoma varium
3. 
   Common name: Pale spine fire urchin

   Scientific name: Astropyga magnifica
4. 
   Common name: Blue-spotted urchin

   Scientific name: Astropyga radiata
5. 
   Common name: Lesser Sand Dollar

   Scientific name: Brissus latecarinatus
6. Common name: groove burrowing urchin

   Scientific name: Brissus unicolor
7. 
   Common name: long-spined urchin

   Scientific name: Centrostephanus longispinus
8. 
   Common name: Long-spined Sea Urchin

   Scientific name: Centrostephanus rodgersii
9. 
   Common name: Sand Dollar

   Scientific name: Clypeaster humilis
10. 
    Common name: Sand Dollar

    Scientific name: Clypeaster reticulatus
11. 
    Common name: sea biscuit

    Scientific name: Clypeaster rosaceus
12. 
    Common name: sand dollar

    Scientific name: Clypeaster subdepressus
13. 
    Common name: Eccentric sand dollar

    Scientific name: Dendraster excentricus
14. 
    Common name: long-spined sea urchin

    Scientific name: Diadema antillarum
15. 
    Common name: Sea urchin

    Scientific name: Diadema savignyi
16. 
    Common name: black longspine urchin

    Scientific name: Diadema setosum
17. 
    Common name: sea-potato

    Scientific name: Echinocardium cordatum
18. 
    Common name: rock-boring urchin

    Scientific name: Echinometra lucunter
19. 
    Common name: rock-boring urchin

    Scientific name: Echinometra mathaei
20. 
    Common name: Green Urchin

    Scientific name: Echinometra viridis
21. 
    Common name: Urchin Spine Snail

    Scientific name: Echinostrephus aciculatus
22. Common name: Burrowing fine spine urchin

    Scientific name: Echinostrephus molaris
23. 
    Common name: banded sea urchin

    Scientific name: Echinothrix calamaris
24. 
    Common name: Diadema urchin

    Scientific name: Echinothrix diadema
25. 
    Common name: common sea urchin

    Scientific name: Echinus esculentus
26. 
    Common name: Pineapple Sea Urchin

    Scientific name: Echinus melo
27. 
    Common name: Sand Dollar

    Scientific name: Encope emarginata
28. 
    Common name: Pencil Urchin

    Scientific name: Eucidaris metularia
29. 
    Common name: slate pencil urchin

    Scientific name: Eucidaris tribuloides
30. 
    Common name: Slate Pencil Urchin

    Scientific name: Goniocidaris tubaria
31. 
    Common name: slate pencil urchin

    Scientific name: Heterocentrotus mamillatus
32. 
    Common name: Heart Urchin

    Scientific name: Lovenia elongata
33. 
    Common name: variegated urchin

    Scientific name: Lytechinus variegatus
34. 
    Common name: West Indian Sea Egg

    Scientific name: Meoma ventricosa
35. 
    Common name: Red Sea Urchin

    Scientific name: Mesocentrotus franciscanus
36. 
    Common name: blue tuxedo urchin

    Scientific name: Mespilia globulus
37. 
    Common name: Starry Blenny

    Scientific name: Metalia spatagus
38. Common name: Bald-patch urchin

    Scientific name: Microcyphus rousseaui
39. 
    Common name: Purple sea urchin

    Scientific name: Paracentrotus lividus
40. 
    Common name: pencil urchin

    Scientific name: Phyllacanthus imperialis
41. 
    Common name: Cidaroid Sea Urchin

    Scientific name: Plococidaris verticillata
42. Common name: Crown-spined Pencil Urchin

    Scientific name: Prionocidaris baculosa
43. 
    Common name: Pencil Sea Urchin

    Scientific name: Prionocidaris bispinosa
44. 
    Common name: Green Sea Urchin

    Scientific name: Psammechinus microtuberculatus
45. Common name: Indiana Urchin

    Scientific name: Pseudoboletia indiana
46. 
    Common name: Spotted Sea Urchin

    Scientific name: Pseudoboletia maculata
47. Common name: Dussumier's Dartfish

    Scientific name: Salmaciella dussumieri
48. Common name: Salmacis Belli

    Scientific name: Salmacis belli
49. 
    Common name: Urchin Banded Shrimp

    Scientific name: Salmacis sphaeroides
50. Common name: Sculpsitechinus auritus

    Scientific name: Sculpsitechinus auritus
51. 
    Common name: Purple heart urchin

    Scientific name: Spatangus purpureus
52. 
    Common name: violet sea urchin

    Scientific name: Sphaerechinus granularis
53. 
    Common name: Purple sea urchin

    Scientific name: Strongylocentrotus purpuratus
54. 
    Common name: red lance urchin

    Scientific name: Stylocidaris affinis
55. 
    Common name: Flower Urchin

    Scientific name: Toxopneustes pileolus
56. 
    Common name: collector urchin

    Scientific name: Tripneustes gratilla
57. 
    Common name: sea egg

    Scientific name: Tripneustes ventricosus