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It's Stramonita haemastoma floridana, or Florida Rock Shell. It's in the murex family, and is predatory on other molluscs: Stramonita haemastoma...
I think the others told ya right, the placement of those snails is typical for parasitic pyramidellids. Sometimes you'll see similar snails on the...
Most snails can survive three or four days, some a lot longer. It's marginal for a few species. If you get them in your tank in 72 hours I'd think...
Corailline identified it for you correctly, of course, butt touching not even required lol.
I hate this species because 1) it turns up in reef tanks over and over, 2) it's just about as intermediate between the Rissoidea and Pyramidellidae...
Yeah, I've been running circles getting ready for a bowfishing tournament this evening, sorry. They are Stramonita haemastoma floridana, or Florida...
It will be interesting to find out, and hopefully Incognito can get some good spire pics. The thing about pyramidellids not having operc's isn't...
...but back to the spider... :) If it has pincers/claws, it's probably a spider-looking crab, since I've never seen either a spider or pycnogonid...
Yeah, Gary is modeled after a stylized land snail, similar to Cepaea nemoralis. There are a few that have both lines and spots, but not distributed...
Yes, it's a Babylonia rather than a Nassarius, and yes, they can be predatory, although they mostly scavenge. Not too long ago they were considered...
The bivalve is a Pen Shell, probably an Atrina species. They are usually buried with the pointed end down, anchored to something with its byssus....
Yes, it's an aeolid nudibranch, but I won't venture a guess as to the ID. Most of the ones that end up in reef tanks as hitchhikers feed on one...
Yup, they get about as large as a decent sized house cat, but probably not in an aquarium. It can eat a lot, though, and may disappear under the...
Yup, it's one of the large vermetids, probably Serpulorbis grandis....
Here's one of the comparative pics, but not the best one. If you get the Turbonilla shell oriented just right, it should be pretty clear that the...
That looks like a rissoid protoconch. The 90 degree transition is pretty distinct on the pyramidellids. Cheers, Don
Look toward the bottom of this LARGE page of thumbnails for harmless rissoids that look like your snails: Shell Catalogue - Family RISSOIDAE...
Well, everyone beat me to it, and most likely answered your questions correctly. The little round turbo-looking snails should be Collonista or...
Here's you some good info on chitons. They have a fairly short pelagic period, typically one to two weeks, so it's conceivable that they could...
...some, but not this particular species.
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