Sea Urchins

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Sea urchins are marine creatures. They are echinoderms and belong to the class of Echinoidea. And can be found in the floor of oceans. They prefer areas with coral reef for safety measures.

Sea urchins love to live within the coral reefs for safety measures

Sea urchins love to live within the coral reefs for safety measures

Sea urchin have more than 100 known species. Which are different in sizes, color and shapes. But mainly in round to oval body shapes. Most of them are red, green, brown, purple or black.

They come in different shapes, sizes and colors.

They come in different shapes, sizes and colors.

Sample species of sea urchin include:

  1. Slate pencil urchin
  2. Caribbean sea urchin
  3. Sea potato
  4. Purple sea urchin
  5. Red sea urchin (longest living)

Their bodies are covered by both spikes and hard shell. The ones with longer spikes are the dangerous one. They have no bones.

For you to be able to tell between a female and male. You need a closer microscopic viewing. Or by observing reproduction.

The spikes are used for:

  • Defense
  • Movements
  • Hunting

Some species of sea urchin have spikes containing venom. Hence giving deadly sting to anyone going near them.

Some spikes contain venom, hence should be handled with care.

Some spikes contain venom, hence should be handled with care.

Sea urchin have 5 paired tube feet that have suckers at the bottom. The suckers help in movements, hunting and sticking on surfaces.

Their mouth is located at the center of its body’s underside. And comprises of five tooth-like plates. While the anus is located at the top of its body.

Sea urchin primarily feed on the algae. They do feed on sessile (immobile) or slow-moving animals occasionally as well as dead fish. Hence they are omnivores just like humans.

Sea urchin observe external fertilization. Whereby the female lay eggs and the male spread sperms on them.

Sea urchin are considered a delicacy in some countries. They are also hunted by crabs, birds, sea otter, among others.

Some people consider sea urchins to be a delicacy

Some people consider sea urchins to be a delicacy

Interesting fact: Sea urchin have no brains and depends on their water-vascular system. This helps in the circulatory systems operations.

Sea urchin have a life span of approximately thirty  years. The red sea urchin can survive up to 200 years.

Our diver was generous to get us a sea urchin during the boat ride.

Our diver was generous to get us a sea urchin during the boat ride.

Conservation concern

  • Sea urchin are mainly affected by ocean pollution. That has contributed to the decline of their population.
  • Over-fishing is a threat that needs to be monitored.
  • Sea urchin are listed as threatened species.
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9 thought on “Sea Urchins”

  1. Heather says:

    Woah! I never knew all of this about sea urchins, they’re amazing. Especially that the red ones can live for up to 200 years. Great post. 🙂 xxx

    1. That one shocked me too. I think it the longest living organism in our planet.

  2. They hurt like crazy if you step on one!!!! 🙂

    1. I saw those spikes especially the longer ones. They are very sharp and firm. One has to be very careful around them.

      1. I scuba and heard they were poisonous if stung. I got hit in the knee with one and I didn’t feel anything. Maybe the Tequila helped. 🙂

        1. Hahahahaha, maybe it did help. Though not all of them contain venom.

  3. cat9984 says:

    I had no idea they were endangered. It’s pretty depressing the number of things we’re killing off.

    1. Its sad, we are eating them at higher rate than they can multiply.

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