Overview

Distribution

In Panama this species is common in both the Gulf of Panama and Gulf of Chiriqui in the eastern Pacific. It can be found under and between rocks and corals, and on the dead sides of Pocillopra spp. reefs (Lessios, 2005). This species has been collected from San Jose Rock (USNM E 14588), Tabogilla Island (USNM E 14578) and Venado Island (USNM E 14577), Gulf of Panama, and from Uva Reef in the Gulf of Chiriqui.

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Source: The Echinoderms of Panama

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Physical Description

Diagnostic Description

References and links

Mortensen, T. (1940). A monograph of the Echinoidea 3(1). Aulodonta. Copenhagen. 370 pp., 196 figures, 77 pls; pages: 275-277.

Lessios, H.A., Kessing, B.D. & Pearse, J.S. 2001. Population structure and speciation in tropical seas: global phylogeography of the sea urchin Diadema. Evol. 55: 955-975.

Lessios, H. A. (2005). Echinoids of the Pacific Waters of Panama: Status of knowledge and new records. Rev. Biol. Tropical 53 (sup. 3):147-170.

Coppard, S. E. & Campbell, A. C. (2004). Taxonomic significance of spine morphology in the echinoid genera Diadema and Echinothrix. Invertebrate Biology, 123 (4), 357-371.

Coppard, S. E. & Campbell, A. C. (2006a). Taxonomic significance of test morphology in the echinoid genera Diadema Gray, 1825 and Echinothrix Peters 1853 (Echinodermata). Zoosystema 28(1), 93-112.

Coppard, S. E. & Campbell, A.C. (2006b). Systematic significance of tridentate pedicellariae in the echinoid genera Diadema and Echinothrix. Invertebrate Biology 125(4), 363-378.

GenBank

The Echinoid Directory

World Echinoidea Database

LSID urn:lsid:marinespecies.org:taxname:513223
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Synonymised taxa

Centrechinus mexicanus (A. Agassiz, 1863) (unaccepted combination)
Diadema mexicana A. Agassiz, 1863 (unjustified emendation)

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Ecology

Habitat

Depth range based on 6 specimens in 1 taxon.
Water temperature and chemistry ranges based on 6 samples.

Environmental ranges
  Depth range (m): 12 - 624
  Temperature range (°C): 6.749 - 26.357
  Nitrate (umol/L): 3.172 - 39.707
  Salinity (PPS): 32.593 - 34.632
  Oxygen (ml/l): 0.171 - 4.432
  Phosphate (umol/l): 0.333 - 3.255
  Silicate (umol/l): 3.167 - 72.834

Graphical representation

Depth range (m): 12 - 624

Temperature range (°C): 6.749 - 26.357

Nitrate (umol/L): 3.172 - 39.707

Salinity (PPS): 32.593 - 34.632

Oxygen (ml/l): 0.171 - 4.432

Phosphate (umol/l): 0.333 - 3.255

Silicate (umol/l): 3.167 - 72.834
 
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

Barcode data: Diadema mexicanum

The following is a representative barcode sequence, the centroid of all available sequences for this species.


No available public DNA sequences.

Download FASTA File
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Source: Barcode of Life Data Systems (BOLD)

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Statistics of barcoding coverage: Diadema mexicanum

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

Diadema mexicanum

Diadema mexicanum is a species of long-spined sea urchin belonging to the family Diadematidae. It is native to the Pacific coast of Mexico, Costa Rica, El Salvador, Nicaragua and Panama.

Reef ecology[edit]

The coral reefs off the coast of Central America are thin and small relative to their counterparts in the Indo-Pacific and Caribbean. They are subject to periodic stresses such as El Niño events. In 1983–3, 50 to 90% of the corals in the region were lost. A large increase in the population of Diadema mexicanum resulted and there was an increase in damage to the reefs caused by their spines.[2] Diadema mexicanum is a herbivore and an important member of the reef community and plays a significant roll in controlling algal growth. By limiting this growth they are capable of preserving coral by reducing competition for space and light. However, when the populations of sea urchins get too large their spines cause excessive abrasion to the corals and bioerosion of the reef. Nevertheless, the reduction in algae present is beneficial for the settlement of coral larvae. A reduction in the number of sea urchins causes overgrowth of algae to the detriment of the corals, and little recruitment of corals occur.[3] For the reef to recover after a bleaching event there needs to be a change in the balance between the rate of reef accumulation and reef erosion. It is necessary to maintain a healthy level of grazing by sea urchins to maintain a moderate algal cover and allow coral recruitment.[2]

References[edit]

  1. ^ Kroh, Andreas (2013). A. Kroh & R. Mooi, ed. "Diadema mexicanum A. Agassiz, 1863". World Echinoidea Database. World Register of Marine Species. Retrieved 2013-11-22. 
  2. ^ a b Alvarado, Juan José; Cortés, Jorge; Reyes-Bonilla, Héctor (2012). "Reconstruction of Diadema mexicanum bioerosion impact on three Costa Rican Pacific coral reefs". Revista de Biología Tropical 60 (2). ISSN 0034-7744. 
  3. ^ Benítez-Villalobos1, F.; Domínguez y Gómez, M.T.; Pérez, R.A. López (2008). "Temporal variation of the sea urchin Diadema mexicanum population density at Bahias de Huatulco, Western Mexico". Revista de Biología Tropical 56 (3): 255–263. ISSN 0034-7744. 
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