Sensational new cephalopods from New Zealand(NORFANZ cruise)

Steve O'Shea

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I just had a wee note from Prof Dick Young, Hawaii (also a TONMO.com member, and as you know, world-ceph guru) to say he'd seen spermatophores implanted in the mantle wall of Histioteuthis before, but not in such tidy rows.

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Aloha Steve,
I've seen the same thing in Histioteuthis but with spermatangia not so neatly aligned. I've always assumed that the cement gland has an enzyme that dissolves tissue. Then as the squid moves, the spermatangia gradually work their way deep into the tissue.
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I learnt something today (well, I pretty much do that every day). Great thesis topic don't you think? Figure out what is going on with these brutes. Takers? You don't even have to do it in NZ - Histioteuthis is everywhere.
Cheers
O
 

Tintenfisch

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:!:

Something else of interest has climbed out of a NORFANZ jar... in sorting through a few onychoteuthids I ran across a pair that look to be conspecific, with the female spent and impregnated with spermatophores (looking like a very small (~10 cm DML) Chaunoteuthis in unusually good condition). The male is even more interesting, however - DML ~7 cm, in excellent condition with no visible damage, except the left-hand tentacle appears to be breaking off about 1 cm from the base (Chaunoteuthis females are always without tentacles; all that remains are two symmetrical stumps that bear no evidence of violent detachment - in fact the stumps are usually smooth and pigmented on the distal face) and the right-hand tentacle is in his beak. As in, turned in, disappearing inside the buccal membrane and firmly wedged, with the club protruding back outwards.
I'm calling these Onychoteuthis sp. for now; the hooks are mostly missing on the male and of course the female only has stumps; small nuchal folds are visible and the gladius protrudes prominently along the dorsal midline.

:tentacle: 8)

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tonmo

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That's wild! Follows up on old discussions we've had re: autophagy. What drives a squid to eat itself? Is "stress" the right answer? (I know it's the common one)...

I wonder if this says anything regarding the sensory ability of their arms? I remember reading a story somewhere that an octopus' arms are largely independent -- that is, their arms act as isolated sensory units, without necessarily registering their findings to the "central brain". Does the same apply to squid? If it did, I wonder whether a squid could eat its own arm without really being aware? :bugout:

I suppose under extreme stress, the body would be less susceptible to pain anyhow.... :confused:
 

um...

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tonmo said:
I wonder if this says anything regarding the sensory ability of their arms? I remember reading a story somewhere that an octopus' arms are largely independent -- that is, their arms act as isolated sensory units, without necessarily registering their findings to the "central brain".

Strangely enough, I was reading about that around 20 minutes ago.

It's mentioned in Cephalopod Behaviour that octopuses receive no proprioceptive information (i.e. feedback about position and motion) from the arms, that they can't discriminate between heavy and light objects, and that the arms seem to act with a good deal of autonomy from the brain. I get the impression that most of the feedback from the arms deals with texture and taste. :?: I was going to ask in the Arms and Brains thread whether the same was true of squid. I'd also like to know if there's any more info on pain perception in cephs, since Cephalopod Behaviour is not definitive on the issue.

I'd really love to know what's going on with the female's tentacles. Do they just fall off at some stage? Or never grow completely? Or get resorbed? Why would any of those things happen? :bugout: (Pictures?)

Crazy squid.
 

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