Overview

Brief Summary

Fossil species

recent & fossil

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Heterocentrotus mamillatus, commonly known as the slate pencil urchin, red slate pencil urchin, or red pencil urchin, is found in tropical waters.  According to the World Register of Marine Species it occurs in Aqaba, Eastern Africa & Madagascar, Kenya, Madagascar, Marsa Shagra, Mascarene Basin, Mauritius, Red Sea, Seychelles and the West Indian Ocean.  According to Wikipedia it occurs more broadly in the Indo-Pacific region and is most abundant in Hawai‘i.

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Ecology

Habitat

Depth range based on 308 specimens in 1 taxon.
Water temperature and chemistry ranges based on 301 samples.

Environmental ranges
  Depth range (m): 0.45 - 18
  Temperature range (°C): 22.924 - 28.770
  Nitrate (umol/L): 0.049 - 0.617
  Salinity (PPS): 33.821 - 36.064
  Oxygen (ml/l): 4.436 - 4.971
  Phosphate (umol/l): 0.075 - 0.238
  Silicate (umol/l): 1.278 - 4.752

Graphical representation

Depth range (m): 0.45 - 18

Temperature range (°C): 22.924 - 28.770

Nitrate (umol/L): 0.049 - 0.617

Salinity (PPS): 33.821 - 36.064

Oxygen (ml/l): 4.436 - 4.971

Phosphate (umol/l): 0.075 - 0.238

Silicate (umol/l): 1.278 - 4.752
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Heterocentrotus mammillatus

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 5
Species With Barcodes: 1
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Wikipedia

Heterocentrotus mamillatus

For the Atlantic species with the same common name, see Eucidaris tribuloides.

Heterocentrotus mamillatus, commonly known as the slate pencil urchin, red slate pencil urchin, or red pencil urchin, is a species of tropical sea urchin from the Indo-Pacific region.

Description[edit]

Radiols (spikes) of a "slate pencil sea urchin". They are a classical souvenir.

This species is a big sea urchin, with a test reaching over 8cm and spikes up to 10cm. The classical color is bright red, but they can also be brown, or even purple. The test and spikes can be of different color, and the spikes can have a white ring at their stem, and be rounded with lighter or darker bands. The spikes are rouded to triangular in cross-section, but always blunt. Specimens from Hawai‘i tend to have bright red spines, while specimens from other parts of the Pacific may have yellowish or brown spines.

Heterocentrotus trigonarius is a similar species that has longer and darker spines, more angular, and is always monochromic.

Range[edit]

This species can be found throughout the tropical waters of the Indo-Pacific region (from the African est coast to Pacific archipelagos), but is especially abundant in Hawai‘i. It is found in shallow waters, often close to surf reefs, between the surface and 8m, sometimes down to 25m.

References[edit]

  1. ^ Kroh, A. (2010). "Heterocentrotus mamillatus (Linnaeus, 1758)". In A. Kroh & R. Mooi. World Echinoidea Database. World Register of Marine Species. 



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