Gracilechinus acutus

Gracilechinus acutus is a species of sea urchin in the family Echinidae, commonly known as the white sea urchin. It is an omnivore and feeds on algae and small invertebrates.[2]

Gracilechinus acutus
Gracilechinus acutus at the Biodiversarium of the Observatoire océanologique de Banyuls-sur-Mer
Scientific classification
Kingdom:
Animalia
Phylum:
Echinodermata
Class:
Echinoidea
Order:
Echinoida
Family:
Echinidae
Genus:
Gracilechinus
Species:
G. acutus
Binomial name
Gracilechinus acutus
Lamarck, 1816 [1]
Synonyms

Description

Gracilechinus acutus usually grow up to 150 mm in diameter in their adult stage. They appear commonly in a reddish to brown-red color with occasional urchins having a green color. There are vertical white stripes on the ambulacral plates. The Gracilechinus acutus have two types of spines, primary and secondary. Its primary spines are long and tapered while secondary spines are more short and thin. The spines act as a defense mechanism against predators. The area around the mouth does not contain spines, but instead have pedicellariae.[3]

Distribution

Gracilechinus acutus is native to the Atlantic Ocean, the English Channel, the North Sea, and the Mediterranean Sea. They are normally located on coarse substrates such as gravel, sandy, and muddy substrates. They can be found in varying depths from a shallow 20 meters below the surface to greater than 1000 meters.[4]

Test of a Gracilechinus acutus

Biology

Gracilechinus acutus are considered very sensitive to disturbance. In research done by the Spanish National Research Council, bottom trawling had a significant effect on the overall biomass and mean size of Gracilechinus acutus. This showed that bottom trawling is a main source of disturbance in benthic habitats with effects on the ecosystem functional diversity. Gracilechinus acutus was measured against different trawling pressures and it was discovered that they can be used as a bioindicator of trawling impact.[5]

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gollark: We cannot, yet, just spin up a bunch of test societies with and without [CONTENTIOUS THING REDACTED] to see if this is actually true.
gollark: > Everything can, and should be tested objectivelySay someone tells you "[CONTENTIOUS THING REDACTED] weakens the fabric of society" or something. We can take this to mean something like "[CONTENTIOUS THING REDACTED] leads to societies being worse off in the long run". How can you actually test this?
gollark: Ideally, but that isn't actually possible in all cases.
gollark: Quantum mechanics still makes very useful predictions even if the exact physical workings aren't known.

References
  1. Echinus acutus Encyclopedia of Life. Retrieved 2011-08-27
  2. "European Marine Life - Echinus acutus - White sea urchin - Echinoderm Biology". www.european-marine-life.org. Retrieved 2019-04-30.
  3. "Gracilechinus acutus". www.sealifebase.ca. Retrieved 2019-04-30.
  4. "WoRMS - World Register of Marine Species". www.marinespecies.org. Retrieved 2019-04-30.
  5. Gonzalez-Irusta, J. M.; Punzon, A.; Serrano, A. (2012-09-01). "Environmental and fisheries effects on Gracilechinus acutus (Echinodermata: Echinoidea) distribution: is it a suitable bioindicator of trawling disturbance?". ICES Journal of Marine Science. 69 (8): 1457–1465. doi:10.1093/icesjms/fss102. ISSN 1054-3139.
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