Friday Fellow: Pink Miniacina

by Piter Kehoma Boll

It’s time  for the next foraminifer, which is always a problematic time, but I managed to find a suitable fellow for this Friday. Called Miniacina miniacea in the scientific community, it obviously lacks a common name, so I decided to call it the pink miniacina.

Differently from the previously introduced foraminifers, the pink miniacina is a sessile and colonial species. It usually grows attached to other lifeforms, especially algae and corals. Due to its colonial nature, added to the already bigger-than-average size of foramnifers when compared to other unicellular organisms, the pink miniacina is easily visible to the naked eye and can be seen as a series of small branched organisms with an intense pink color. It is particulary common in the Mediterranean Sea, although it can be found in other places as well.


Several pink colonies of Miniacina miniacea growing in the Mediterranean Sea. Photo by Stefano Guerrieri.

Due to its habit of living on the surface of other sessile organisms, the pink miniacina competes with many other organisms that have the same behavior. As a result, its abundance tends to increase in deeper water, where many of such organisms find the conditions too unsuitable to live. In a few areas, the abundance of the pink miniacina may be high enough to create a “pink sand” from the shells of dead specimens.

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Di Camillo, C.; Bo, M.; Lavorato, A.; Morigi, C.; Reinach, M. S.; Puce, S.; Bavestrello, G. (2008) Foraminifers epibiontic on Eudendrium (Cnidaria: Hydrozoa) from the Mediterranean Sea. Journal of the Marine Biological Association of the United Kingdom88(3): 485–489.

Milliman, J. D.(1976) Miniacina miniacea: modern foraminiferal sands on the Outer Moroccan shelf. Sedimentology23: 415–419.


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Filed under Friday Fellow, protists

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