name = Granrojo
regnum = Animalia
phylum = Cnidaria
classis = Scyphozoa
ordo = Scyphomedusae
familia = Ulmaridae
genus = "Tiburonia"
species = "T. granrojo"
binomial = "Tiburonia granrojo"
binomial_authority = Matsumoto, 2003

Granrojo or big red, "Tiburonia granrojo", is a recently discovered jellyfish of the family Ulmaridae, the only member of its genus yet identified. It is one of the largest sea jellies and unusual in a number of ways. "Tiburonia granrojo" live at ocean depths of between 600 and 1500 metres and have been found across the Pacific Ocean in the Sea of Cortez, Monterey Bay, Hawaii and Japan. They grow to between 60 and 90 cm (2 to 3 feet) in diameter and have thick fleshy oral arms in place of the long tentacles found in most jellies. The entire jellyfish is deep red in color. [Cite news | pages = 1 | last = Perlman | first = David | title = Mysteries of the Animal World: New Jellyfish: Big Red has cluster of arms, not tentacles | work = San Francisco Chronicle | accessdate = 2008-07-16 | date = 2003-05-07
url =

To date, only 23 members of the species have been found and only one, a small specimen (under 15 cm) has been retrieved for further study. Several high resolution videos of granrojo have been taken by remote controlled submarines. Its discovery was announced by George Matsumoto and colleagues in "Marine Biology" in 2003. [Cite journal
doi = 10.1007/s00227-003-1047-2
volume = 143
issue = 1
pages = 73-77
last = Matsumoto
first = G. I.
coauthors = K. A. Raskoff, D. J. Lindsay
title = Tiburonia granrojo n. sp., a mesopelagic scyphomedusa from the Pacific Ocean representing the type of a new subfamily (class Scyphozoa: order Semaeostomeae: family Ulmaridae: subfamily Tiburoniinae subfam. nov.)
journal = Marine Biology
accessdate = 2008-07-17
date = 2003-07-01
url =



Cite journal
volume = 84
issue = 01
pages = 37-42
last = Raskoff
first = K. A.
coauthors = G. I. Matsumoto
title = Stellamedusa ventana, a new mesopelagic scyphomedusa from the eastern Pacific representing a new subfamily, the Stellamedusinae
journal = Journal of the Marine Biological Association of the UK
date = 2004

Cite journal
volume = 54
issue = 8
pages = 1241-1255
last = Osborn
first = D. A.
coauthors = M. W. Silver, C. G. Castro, S. M. Bros, F. P. Chavez
title = The habitat of mesopelagic scyphomedusae in Monterey Bay, California
journal = Deep-Sea Research Part I
date = 2007

Cite journal
volume = 530
issue = 1
pages = 537-547
last = Lindsay
first = D. J.
coauthors = Y. Furushima, H. Miyake, M. Kitamura, J. C. Hunt
title = The scyphomedusan fauna of the Japan Trench: preliminary results from a remotely-operated vehicle
journal = Hydrobiologia
date = 2004

External links

* [ Article in the California Academic of Sciences's "Science Now"] (Several high qualiy images)
* [ Article for National Geographic Today]
* [ Report in "Innovations Report"]
* [ Release in MBARI News]

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