nightfly's picture

Many Ribbed Jellyfish

Observed: 26th August 2013 By: nightflynightfly’s reputation in Invertebratesnightfly’s reputation in Invertebratesnightfly’s reputation in Invertebratesnightfly’s reputation in Invertebratesnightfly’s reputation in Invertebrates
CIMG2932
Description:

http://doris.ffessm.fr/fiche2.asp?fiche_numero=231
A similar looking jellfish is pictured on this webpage.

Identifications
Species interactions

No interactions present.

Comments

dejayM's picture

link

nightfly's picture

Hi Derek, Thanks for the

Hi Derek,

Thanks for the agreement and link, I hadnt seen this one before so I just didnt know if there were similar species. Glad to hear it is distinctive, its always easier when theres only one that looks as it does.

Cathal.

ChrisMcA's picture

Great find, Cathal! But not

Great find, Cathal! But not so sure about the species, as there are 2 very similar it seems, forskalea & vitrina, http://species-identification.org/species.php?species_group=zmns&menuent... & http://species-identification.org/species.php?species_group=zmns&menuent...
comparing descriptions it looks like yours is nearer vitrina.
(NB it's a hydromedusan, class hydrozoa)
There are 2 more on ispot,http://www.ispot.org.uk/species_dictionary/Aequorea

nightfly's picture

Thanks for the info Chris,

Thanks for the info Chris, it'd be just too simple to have one looking like the above. Its rarely the case. Thanks for the links.

The marine life locally is very interesting these past 2 weeks. There are a lot of herring fry around and many fish and birds feeding on them. Porpoise, dolphin and basking shark all being observed. The multitudes of mackerel feeding on the fry are undoubtedly attracting the attention of some bigger species. Not sure if it was coincidence or not but a basking shark was lingering around last night in the exact area of the herring fry?

Most interesting of all however has been the sight of tuna jumping. Thyeve been spotted 3 times by different people. Its seems to be one fish at a time jumping repeatedly, eg 4 leaps and then nothing. I am going out in the boat this evening again with the long shot hope of photographing a jumping tuna. I managed a pic and video of a basking shark last night but to get a pic of the tuna good enough to determine the species would be something else.

Cathal.

nightfly's picture

No tuna seen this evening

No tuna seen this evening Chris but several small groups of porpoise instead-

http://www.ispot.org.uk/node/366618

Cathal.

ChrisMcA's picture

Your tuna's reminded me of a

Your tuna's reminded me of a 'missed photo-op' wading across the Gann estuary nr Dale Pembs, when a trout jumped 2ce at least only a few yds away- but jumping tuna's something else altogether!
This Aequorea has reminded me of the trouble I had (with species.org) in ID'g it in the 1st place, at http://www.ispot.org.uk/node/277498. [It's key identifiers are radial canals & (marginal) tentacles]
In species.org the RADIAL CANALS are given as FORSKALEA:- 60-80/less/upto160; VITRINA 60-100
(marginal) TENTACLES for FORSKALEA usually< than canals but from 1/2 to 2x; & for VITRINA more than 3x the radial canals.
Having counted yours I made about 129 radial canals, & more than 2ce as many radial tentacles
However your French site http://doris.ffessm.fr/fiche2.asp?fiche_numero=231 (Aequorea forskalea) describes the radial canals as "bruns ou bleu sombre" =brown or dark blue, & it's sister site http://doris.ffessm.fr/fiche2.asp?fiche_numero=245 (Aequorea vitrina) "blanch a bleu pale" (white to pale plue) & a good match for yours.
Likewise EOL's Aequorea vitrina, http://eol.org/pages/201520/media has 5 to 6 images just like yours but it's single A. forskalea isn't. (& WoRMS follows EOL with it's 2 pics)
There's also a 13page pdf from the Plymouth laboratoty (1938 or 9) http://sabella.mba.ac.uk/1006/01/On_the_nematocysts_of_hydro-medusae,_II... of which pp 347&8, 352 & 355 concern Identifcn of Aequorea (again favour vitrina)

nightfly's picture

Thorough research Chris! This

Thorough research Chris! This part alone seems quite persuasive:

"However your French site http://doris.ffessm.fr/fiche2.asp?fiche_numero=231 (Aequorea forskalea) describes the radial canals as "bruns ou bleu sombre" =brown or dark blue, & it's sister site http://doris.ffessm.fr/fiche2.asp?fiche_numero=245 (Aequorea vitrina) "blanch a bleu pale" (white to pale plue) & a good match for yours."

It seems to match vitrina better on several counts. Please feel free to add the ID, these canals are certainly not brown or dark blue.

Cathal.

dejayM's picture

thoughts

Unmistakable. I thought!
(from Shetland)