well, im just about as far from an expert there is on this board but, the prey is going to be shredded fairly small by the time it gets past the radula... i cant remember, but you might want to check the "challenge" thread in phys and bio, that involved stomach contents of archi...frank h. said:From Kat Bolstad's article on "Deep Sea Cephalopods" on this site, I learn that the gut of Architeuthis dux has a maximum relaxed diameter of only 10mm. Is the implication here that Architeuthis can only eat relatively small prey?
Hi Frank. That's a rather interesting post. The oesophagus of Architeuthis and Mesonychoteuthis is of comparable diameter, in that it is narrow in both (10-15mm). Both squid eat prey larger than this greatest dimension, but the prey is chopped up into quite small pieces by the beaks and (theoretically) further masticated by the radula (although the radula doesn't really seem to play a major role in chopping the prey up, in that squid flesh in the gut of Architeuthis isn't scoured by the radular teeth).frank h. said:From Kat Bolstad's article on "Deep Sea Cephalopods" on this site, I learn that the gut of Architeuthis dux has a maximum relaxed diameter of only 10mm. Is the implication here that Architeuthis can only eat relatively small prey?
What is known about the gut of Mesonychoteuthis? Is it much wider in diameter than that of Architeuthis?
Is there any real evidence as to the lifespan of these large squids? I read somewhere that cephalopods as a whole seem to have short lifespans, and that a very rapid growth rate is thereby implied for Architeuthis. What about Mesonychoteuthis?
There is a general rule that prey species are shorter-lived, and much more fecund, than their predators. It has been reported that the Patagonian Toothfish, which seems to be a very long-lived species, is a major part of the diet of Mesonychoteuthis. This might indicate that Meso. has a considerably longer basic life span than is typical for cephalopods.
The Patagonian Toothfish itself seems to be quite an imposing creature, for a bony fish.Steve O'Shea said:The smaller Mesonychoteuthis are eaten by larger Patagonian Toothfish, so it could become a circular argument.