Mussa (genus)

Mussa is a genus of stony coral in the family Mussidae. It is monotypic, being represented by the single species Mussa angulosa, commonly known as the spiny or large flower coral. It is found on reefs in shallow waters in the Caribbean Sea, the Bahamas and the Gulf of Mexico.

Mussa
Scientific classification
Kingdom: Animalia
Phylum: Cnidaria
Class: Anthozoa
Order: Scleractinia
Family: Mussidae
Genus: Mussa
Oken, 1815[1]
Species:
M. angulosa
Binomial name
Mussa angulosa
(Pallas, 1766)
Synonyms

(Species)

  • Madrepora angulosa Pallas, 1766

Description

Mussa angulosa is a colonial species and the whole clump forms a low dome that may reach 50 centimetres (20 in) across. The corallites are phaceloid, that is they have a tubular form growing from a common base, in series of one to three, or occasionally up to five. The individual corallites are large, being 25 to 45 mm (1.0 to 1.8 in) in diameter and up to 6 mm (0.2 in) high. There are four cycles of septa in each corallite, nearly equal in size; they are narrow and curved, with wide spacing.[2][3] The individual polyps are very large, sometimes reaching a length of 12 centimetres (4.7 in) and a diameter of 4 centimetres (1.6 in). They completely obscure the short branches of the stony skeleton on which they occur. During the day the polyps appear fleshy, but during the night they expand further and each is fringed by a rim of short tentacles. The colour of the polyps is variable, being grey or pale brown with green, pink and purple shades.[4][5] The tissues of this coral contain symbiotic single-celled algae called zooxanthellae. These are photosynthetic and absorb energy from the sun to create organic compounds which are used by the coral.[1]

Distribution

Mussa angulosa occurs in the Caribbean Sea, the Gulf of Mexico and the Bahamas, and on reefs and banks off the coast of Texas and southern Florida. It is found in water between 3 and 60 metres (10 and 197 ft) deep but most often between 10 and 30 metres (33 and 98 ft).[6]

Biology

Mussa angulosa is a reef-building species and is aggressive, attacking other fast-growing corals that start to grow close by and threaten to overgrow it or shade it.[4] Its cnidocytes are so powerful that no other Caribbean corals can successfully attack it.[4] It leans away from the current as it grows and reacts adversely to increased sedimentation.[6]

Status

There are no specific threats facing this coral and the IUCN Red List of Threatened Species lists it as being of "Least Concern". It is however probably declining because of the degradation of coral reefs by mechanical damage, climate change and ocean acidification. It is susceptible to coral bleaching and the coral diseases that affect stressed corals. Off the coasts of the United States it is present in various marine parks and other conservation areas, in both of which it is protected.[7]

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References
  1. Hoeksema, Bert (2013). "Mussa Oken 1815". WoRMS. World Register of Marine Species. Retrieved 2013-02-25.
  2. "Mussa Oken 1815". Neogene Marine Biota of Tropical America. 2004. Retrieved 2013-02-25.
  3. Budd, Ann F.; Fukami, Hironobu; Smith, Nathan D.; Knowlton, Nancy (2012). "Taxonomic classification of the reef coral family Mussidae (Cnidaria: Anthozoa: Scleractinia)". Zoological Journal of the Linnean Society. 166 (3): 465–529. doi:10.1111/j.1096-3642.2012.00855.x.
  4. Colin, Patrick L. (1978). Marine Invertebrates and Plants of the Living Reef. T.F.H. Publications. p. 270–274. ISBN 0-86622-875-6.
  5. "Mussa angulosa (Pallas 1766)". Coralpedia. Retrieved 2012-10-19.
  6. "Mussa angulosa (Pallas 1766)". NatureServe Explorer. July 2012. Retrieved 2012-10-19.
  7. Aronson, R.; Bruckner, A.; Moore, J.; Precht, B.; Weil, E. (2008). "Mussa angulosa". IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. Retrieved 2012-10-19.
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