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About pagojoe

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    Sea Nettle

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    Nikon Coolpics 950
  1. Hi Anne, I told Leslie that I had no idea what you'd found, but as I thought about it, I decided it MIGHT be a Pen Shell, laying on its side with the beak buried. There are several species, and I'm not sure I could narrow it to the species level without cleaning it up (assuming it does indeed belong to the Pinnidae). Leslie steered you right by sending you to the jaxshells site, I think. Check out this photo of Atrina rigida, and try to imagine what it would look like with a little stuff growing on it http://www.jaxshells.org/417aa.htm If we're seeing only part of the shell in your pic, Atrina seminuda is also a candidate: http://www.jaxshells.org/514a.htm Cheers, Don
  2. It's a very nice photo, and no other views are really needed. I just meant that it looks like the shell of the animal opens to the left, if it's held spire up (the right side up). The juvenile spire may just be tricking me, though. Cheers, Don
  3. It does look like it may be a bulla-stage juvenile of Calpurnus verrucosus. It's too skinny for an adult. It also looks like the photo may be inverted, making the animal appear to be sinistral? Cheers, Don
  4. Thanks to Jeremy and Leslie for the links and info. The Cayman ratio may or may not be an exaggeration I guess, depending on the species of gorgonians that are available. Around Key West, for every ten Cyphoma gibbosum you find, you will find about three Cyphoma mcgintyi, and about one Cyphoma signatum. Not 1 to 10,000, but they are considerably less common. Cheers, Don
  5. Hi Marli, They are Strombus (Canarium) dentatus. They're more nocturnal than most strombids, and have variable but beautifully-patterned shells. All the adults have the small denticles near the siphonal canal, on the anterior part of the lip. http://www.gastropods.com/9/Shell_1339.html Cheers, Don
  6. Hi Anne, I'm about to step outside my area of expertise, but I'll give you a guess. I'm pretty sure it's a velutinid, probably a Lamellaria species. None of my references show more than a couple of live animal photos, and none looks very close to yours. I can't see any tentacles (or antennae, or "feelers"), but maybe you saw some as you watched it move? If it's a velutinid, it should have a thin internal shell. It looks like I can vaguely make out the internal shell in your photos. Here's a link to an Australian Lamellaria for comparison: http://www.nudibranch.com.au/pages/2643b.htm It's on a nudibranch page, but of course it isn't a nudibranch. Looks pretty similar? Cheers, Don
  7. Sorry I didn't really answer your question, but you probably Googled it already. The common name is Giant Tun. Don
  8. Yup, I believe you guys all nailed it down to the genus. If you'd asked me my guess without looking at the photo, I'd have guessed Tonna perdix, too. Tonna perdix sometimes lacks the feathered markings on parts of the shell, but this usually only occurs in gerontic individuals, and only on maybe a quarter or a third of the last whorl. The markings wouldn't be lacking on as much of the shell as is visible in the pic, so it's not that one. If it came from Lembeh, it's not one of the species restricted to eastern Australia or Hawaii, so it's probably Tonna galea. The species has a worldwide distribution in tropical and subtropical waters, but doesn't seem to be very common anywhere. I've only found one specimen in all my diving and snorkeling. They get comparatively huge, over 300mm. The foot on one that size would be nearly a meter front to back. Cheers, Don
  9. Well that's an interesting shot. You're right, both those guys are predators, but they aren't supposed to predate on each other... Conus sponsalis (nanus) is reportedly a worm eater, but he's obviously checking out the smaller snail. His siphon is right against the head or body of the little guy. I think the encrusted one is an Engina species, as it has the characteristic dark gray and white banded siphon. He's pretty optimistic if he's thinking about having a cone snail dinner. Cheers, Don
  10. Hi All, I tried to answer this message directly, but the forum wouldn't accept my post. Thanks for relaying for me, Leslie. I'm not really sure how well an abalone can see, but I suspect its eyes simply distinguish between light and dark, and can't really resolve images. Most snails will react to shadows passing over them, or lights being turned on or off, and abalones will do the same. I've seen cowries react to the presence of predatory cone snails, but I suspect it was due to some sense other than eyesight. Cowry eyes are about as sophisticated as abalone eyes, i.e., not very. I enjoyed seeing the Haliotis asinina photos, great views of the animal. Cheers, Don
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