Echinometra oblonga explained

Echinometra oblonga, also called the oblong urchin or 'ina 'ele 'ele (ina= generic name for urchin, 'ele 'ele= blackish) in Hawaiian, is a very common rock boring urchin on shallow rocky shores of the tropical Indo-Pacific and Southern Africa.^[1]

Description

Echinometra oblonga shows a range of color from dark purple to black. Their spines are shorter, and more blunt than other species of Echinometra.^[2]

Reproduction

Echinometra oblonga, are gonochoric.^[3] They fertilize externally. Their eggs are either held on the peristome or around the periproct.

Habitat

Echinometra oblonga generally live in rougher-water areas of tropical reefs.^[1] To protect themselves from the force of the waves, they live in the holes of the reef, but they also live on exposed reef flats. As the urchin grows, they use their jaws to help enlarge holes in the reef. Their spines trap seaweed and algae from the reef, which they then transfer to the mouth.

Notes and References

1. Russo . AR . 1977 . Water flow and the distribution and abundance of echinoids (genus Echinometra) on an Hawaiian Reef . Marine and Freshwater Research . 28 . 6 . 693 . 10.1071/mf9770693 . 1323-1650.
2. McClintock . James B. . 2019-10-22 . Disappearance of the rock-boring urchin Echinometra lucunter (Echinoidea: Echinodermata) in urchin-burrows along an extensive rock wall of Grotto Beach, San Salvador, Bahamas . Caribbean Journal of Science . 49 . 2–3 . 290 . 10.18475/cjos.v49i2.a16 . 204811131 . 0008-6452.
3. Web site: Echinometra oblonga, Short-spined black urchin. 2022-02-18. www.sealifebase.ca.