Class

Common name: Sea Urchins

Scientific name: Echinoidea

Echinoidea, commonly known as sea urchins, are fascinating marine invertebrates that belong to the phylum Echinodermata. They are characterized by their globular shape and spiny exterior, which serves as a defense mechanism against predators. Sea urchins come in various colors, including black, purple, red, and green, making them a visually appealing addition to marine aquariums.

These creatures are primarily herbivorous, feeding on algae, but some species are known to be omnivorous, consuming small invertebrates. This dietary habit makes them beneficial in reef tanks as they help control algae growth, contributing to the overall health of the aquarium ecosystem. However, their feeding habits can also be a double-edged sword, as they may graze on corals or other desirable marine plants if not monitored properly.

Sea urchins have a unique water vascular system that aids in locomotion, feeding, and respiration. They move using tube feet that extend through their spines, allowing them to navigate rocky substrates and coral reefs efficiently. This adaptation is not only intriguing but also highlights the success of echinoderms in diverse marine environments.

When considering adding sea urchins to a home aquarium, it's important to ensure that the tank environment mimics their natural habitat. This includes maintaining stable water parameters, providing ample hiding spaces, and ensuring a balanced diet. Hobbyists should also be cautious of the species they select, as some sea urchins can grow quite large and may require more space than initially anticipated. Additionally, handling sea urchins should be done with care due to their spines, which can cause injury if not handled properly.

Overall, Echinoidea can be a captivating and useful addition to marine aquariums, offering both aesthetic appeal and functional benefits. Their presence can enhance the biodiversity of a tank while also serving practical roles in maintaining the ecosystem balance.

  1. Magnificent fire urchin (Asthenosoma ijimai) near Anilao, Batangas, Luzon, Philippines.  Underwater photography and travel.
    Common name: Fire Urchin
    Scientific name: Asthenosoma ijimai
  2. Coleman Shrimp, Periclimenes colemani, Sea Urchin, Variable Fire Urchin, Asthenosoma varium, Coral Reef, Lembeh, North Sulawesi, Indonesia, Asia
    Common name: variable fire urchin
    Scientific name: Asthenosoma varium
  3. Magnificent Urchin Astropyga magnifica
    Common name: Pale spine fire urchin
    Scientific name: Astropyga magnifica
  4. Blue-spotted Urchin (Astropyga radiata)
    Common name: Blue-spotted Urchin
    Scientific name: Astropyga radiata
  5. Sand dollar and shell lying on the beach
    Common name: Lesser Sand Dollar
    Scientific name: Brissus latecarinatus
  6. Common name: groove burrowing urchin
    Scientific name: Brissus unicolor
  7. Hatpin sea urchin - Centrostephanus longispinus
    Common name: long-spined urchin
    Scientific name: Centrostephanus longispinus
  8. Large almost black Rodgers sea urchin Centrostephanus rodgersii hiding in rock crevice covered with colourful encrusting invertebrate life forms.
    Common name: Long-spined Sea Urchin
    Scientific name: Centrostephanus rodgersii
  9. Close up of sea urchin Sand dollar, Cake urchin or Sea Biscuits on sandy bottom in sun glare, Red sea, Egypt
    Common name: Sand Dollar
    Scientific name: Clypeaster humilis
  10. Close up of sea urchin Sand dollar, Cake urchin or Sea Biscuits on sandy bottom in sun glare, Red sea, Egypt
    Common name: Sand Dollar
    Scientific name: Clypeaster reticulatus
  11. Common name: sea biscuit
    Scientific name: Clypeaster rosaceus
  12. A Sand Dollar (Clypeaster subdepressus) on the beach
    Common name: sand dollar
    Scientific name: Clypeaster subdepressus
  13. Eccentric Sand Dollar - Dendraster excentricus
    Common name: Eccentric sand dollar
    Scientific name: Dendraster excentricus
  14. Underwater two long spined sea urchins, Diadema antillarum, on the seabed in the Caribbean sea
    Common name: long-spined sea urchin
    Scientific name: Diadema antillarum
  15. Diadema Savignyi - Diadematidae - Long-spined sea urchin - Black longspine urchin  - Banded diadem
    Common name: Sea urchin
    Scientific name: Diadema savignyi
  16. Sea Urchin Or Urchin Or Sea Hedgehog Diadema Setosum Swimming In
    Common name: black longspine urchin
    Scientific name: Diadema setosum
  17. Heart urchin, Echinocardium cordatum, Raja Ampat Indonesia.
    Common name: sea-potato
    Scientific name: Echinocardium cordatum
  18. Hawaiian Pink Rock Boring Urchin
    Common name: rock-boring urchin
    Scientific name: Echinometra lucunter
  19. Rock Boring Urchin (Echinometra mathaei) underwater hidden in a hole in coral, lagoon of Bora Bora, Pacific ocean, French Polynesia
    Common name: Rock Boring Urchin
    Scientific name: Echinometra mathaei
  20. Reef urchin Echinometra viridis
    Common name: Green Urchin
    Scientific name: Echinometra viridis
  21. Needle-Spined Urchin on Coral Reef
    Common name: Urchin Spine Snail
    Scientific name: Echinostrephus aciculatus
  22. Common name: Burrowing fine spine urchin
    Scientific name: Echinostrephus molaris
  23. Bleistift-Diademseeigel  Echinothrix calamaris
    Common name: banded sea urchin
    Scientific name: Echinothrix calamaris
  24. Sea Urchin at Seabed Diadema Setosum
    Common name: Diadema urchin
    Scientific name: Echinothrix diadema
  25. Single European Edible Sea Urchin - latin Echinus esculentus - inhabiting seashore coastal waters of western Europe, in an zoological garden marine aquarium
    Common name: common sea urchin
    Scientific name: Echinus esculentus
  26. White Urchin
    Common name: Pineapple Sea Urchin
    Scientific name: Echinus melo
  27. Old sand dollar
    Common name: Sand Dollar
    Scientific name: Encope emarginata
  28.  slate pencil urchin Heterocentrotus mammillatus
    Common name: Pencil Urchin
    Scientific name: Eucidaris metularia
  29. Eucidaris tribuloides, the slate pencil urchin
    Common name: slate pencil urchin
    Scientific name: Eucidaris tribuloides
  30. close up underwater photo of red slate pencil urchin
    Common name: Slate Pencil Urchin
    Scientific name: Goniocidaris tubaria
  31. oursin crayon , Heterocentrotus mamillatus
    Common name: slate pencil urchin
    Scientific name: Heterocentrotus mamillatus
  32. Heart urchin, Echinocardium cordatum, Raja Ampat Indonesia.
    Common name: Heart Urchin
    Scientific name: Lovenia elongata
  33. Variegated sea urchin Lytechinus variegatus
    Common name: variegated urchin
    Scientific name: Lytechinus variegatus
  34. Test (hard shell) of red heart urchin or cake urchin, large heart urchin (Meoma ventricosa) undersea, Caribbean Sea, Cuba, Playa Cueva de los peces
    Common name: West Indian Sea Egg
    Scientific name: Meoma ventricosa
  35. Red Sea Urchins
    Common name: Red Sea Urchin
    Scientific name: Mesocentrotus franciscanus
  36. Blue Tuxedo Urchin
(Mespilia globulus)
    Common name: blue tuxedo urchin
    Scientific name: Mespilia globulus
  37. Starry Blenny (Salarias ramosus)
    Common name: Starry Blenny
    Scientific name: Metalia spatagus
  38. Common name: Bald-patch urchin
    Scientific name: Microcyphus rousseaui
  39. Group of sea urchins underwater ( purple sea urchin  Paracentrotus lividus), eastern Atlantic Ocean, Spain, Galicia
    Common name: Purple sea urchin
    Scientific name: Paracentrotus lividus
  40. Phyllacanthus Imperialis - Imperial Sea Urchin - Imperial Urchin - Pencil Sea Urchin
    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. View of pencil urchin behind corals
    Common name: Pencil Sea Urchin
    Scientific name: Prionocidaris bispinosa
  44. Underwater marine life, Psammechinus microtuberculatus commonly called green sea urchin, Mediterranean Sea
    Common name: Green Sea Urchin
    Scientific name: Psammechinus microtuberculatus
  45. Common name: Indiana Urchin
    Scientific name: Pseudoboletia indiana
  46. stained collector urchin (Pseudoboletia maculata) from Cebu, Philippines isolated on white background
    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. shrimp inside the urchin
    Common name: Urchin Banded Shrimp
    Scientific name: Salmacis sphaeroides
  50. Common name: Sculpsitechinus auritus
    Scientific name: Sculpsitechinus auritus
  51. Purple Urchin on a Rock
    Common name: Purple heart urchin
    Scientific name: Spatangus purpureus
  52. Underwater Mediterranean purple sea urchin - Sphaerechinus granularis
    Common name: violet sea urchin
    Scientific name: Sphaerechinus granularis
  53. OURSIN VIOLET strongylocentrotus purpuratus
    Common name: Purple sea urchin
    Scientific name: Strongylocentrotus purpuratus
  54. Red lance urchin, Small lance sea urchin, Stylocidaris affinis.Sea-urchin
    Common name: red lance urchin
    Scientific name: Stylocidaris affinis
  55. Flower Urchin (Toxopneustes pileolus)
    Common name: Flower Urchin
    Scientific name: Toxopneustes pileolus
  56. Collector Urchin (tripneustes gratilla)
    Common name: collector urchin
    Scientific name: Tripneustes gratilla
  57. White Sea Urchin Tripneustes ventricosus in a coral reef
    Common name: sea egg
    Scientific name: Tripneustes ventricosus