paula ferris's picture

Another Stalked Jellyfish

Observed: 6th June 2013 By: paula ferrispaula ferris’s reputation in Invertebratespaula ferris’s reputation in Invertebrates
sm stalked jelly 2
Description:

One of 3 stalked jellyfish found in algae on side of deep gulley, the only one visible to the naked eye, a second similar and a third, a different species (possibly H salpinx), were found later under x10 field scope amongst weed taken home.

Identifications
Species interactions

No interactions present.

Comments

ChrisMcA's picture

Judging from the collins

Judging from the collins guide (& internet sites) all the other stalked jellyfish of the same shape either have >100 tentacles in each clump or are visibly spotty

ChrisMcA's picture

Forgot to say what a great

Forgot to say what a great find! And a 1st for Ispot

JoC's picture

H. auricula

The lack of anchors in the sinuses is strange, but at present I cannot offer any other id either. The lack of spots seems to rule out 2 of the Lucernariopsis species.

Jo

ChrisMcA's picture

2 of the Haliclystus auricula

2 of the Haliclystus auricula in MarLIN, http://www.marlin.ac.uk/speciesinformation.php?speciesID=3445 don't show their anchors, & I can't see any Lucernariopsis cruxmelitensis without superficial spots. And EOL http://eol.org/pages/203524/overview describes "Unique to the Lucernariopsis cruxmelitensis is the arrangement of the nematocyst organs, which appear as white spots in the shape of a maltese cross"
& this stalked jelly doesn't look almost stalkless. Neither can I see any Haliclystus auricula with spots.

gramandy's picture

the distinguishing feature...

...and main ID for kaleidoscope is the anchor which is interlobular and is clearly visible as a white spot between the lobes in most pics of the kaleidoscope jellyfish including 2 of the Marlin pics :)

The nematocyst organs are best visualised from inside the trumpet and may not always be seen from the outside, as you may have noticed I have had second thoughts and this may be H.salpinx but is not H.auricula.

ChrisMcA's picture

The anchors are only visible

The anchors are only visible in the 2nd of the 3 MarLIN pictures, & I havent noticed any change in the jelly you observed (I just checked). But have fd evidence yours may be salpinx
Found (on googling Haliclystus salpinx, on about page 4) a pacific site, [Zootaxa, Haliclystus californiensis, a “new” species of stauromedusa ...] (NB I clicked the cached PDF versn instead of bitstream) describing in detail a new species H.californiensis, which also gives a key to the other 10 Haliclystus sp's in the world on P.9
[10. Lacking white nematocyst clusters. With 30–200 gonadal sacs in each gonad. Anchors coffee bean-shaped, longer than wide. Usually more than 100 secondary tentacles, but as little as 30, in each tentacle cluster. N Atlantic and N
Pacific ......... Haliclystus auricula] Only auricula is specified as without white spots

dejayM's picture

Goblet - no anchors

Chris's (who needs to remove his agreement) second link is, I believe, conclusive.
Using the key at STAUROMEDUSAE UK, having arrived at Section Three, we will surely disengage (from the Key), each time, at Craterolophus convolvulus
".....much reduced amounts of oral spotting (nematocysts) (which we cannot see though).
6. Bell with no arms, stalk as long as bell .............8
7. Bell with arms, short stalked.........................9
8. Arms absent, gonads horseshoe shaped, stalk as long as bell, bell <10mm diameter, thistle-like in ventral view.
............. Depastrum cyathiforme
9. Bell elongated, goblet shape, short stalked, arms short, tentacles short.
............. Craterolophus convolvulus
Oh dear, I've made it Likely!

Nick Upton's picture

Goblet

A good bit of keying work using the www.stauromedusae.co.uk site and the pics looks spot on too.

Nick Upton, naturalist and photographer.

A-P-H-O-T-O's picture

Craterolophus convolvulus

Yes I'd agree with Craterolophus convolvulus, but not an easy one at all because of its size, could well be confused with Lucernariopsis campanulata. The giveaway for C. convolvulus is its oral face and its arrangement of gonads, there do appear to be a few gonadal sacs forming in the image, but perhaps one of the best characteristics to use here is the positioning of tentacles, as there appear to be a few tentacles on the aboral surface of the arms, rather than just at the ends of the arms, probably quite a reliable characteristic.

I managed to come across a Lucernariopsis campanulata with a 2mm oral diameter last week, on looking at it in detail on my camera in the field (Pentax WG3 GPS), you could see the lateral markings and papillations, and even before the arms had chance to form. This was later confirmed by looking at the images on my PC.

APHOTO Wildlife Image Libraries
www.a-p-h-o-t-o.com

JoC's picture

C. convolvulus

Thanks for resurrecting this iSpot, David, with you recent comment. It now seems certain & I have changed my agreement to the id. It has been, as often, an interesting journey to get here.

Jo