Payl:Xenophora granulosa granulosa (granulose carrier snail) 2 (24649717291).jpg
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DeskripsyonXenophora granulosa granulosa (granulose carrier snail) 2 (24649717291).jpg |
Xenophora granulosa granulosa Ponder, 1983 - granulose carrier snail. (apical view) (public display, Bailey-Matthews Shell Museum, Sanibel Island, Florida, USA) The gastropods (snails & slugs) are a group of molluscs that occupy marine, freshwater, and terrestrial environments. Most gastropods have a calcareous external shell (the snails). Some lack a shell completely, or have reduced internal shells (the slugs & sea slugs & pteropods). Most members of the Gastropoda are marine. Most marine snails are herbivores (algae grazers) or predators/carnivores. The xenophorid snails (a.k.a. carrier snails), especially those in the genus Xenophora, are remarkable for their tendency to pick up other shells, skeletal fragments, rocks, or corals (sometimes still alive) from their surrounding environment and cement these objects to their own shells. The result looks like a pile of shells on the seafloor. Often, sponges and serpulid worm tubes are found encrusting the xenophorid shell - they contribute to the illusion that a xenophorid is simply a patch of seafloor. Xenophora carrier snails do this as a camouflage defense against predators. Decorator crabs are arthropods that engage in similar camouflage behavior (<a href="http://storage.montereybayaquarium.org/storage/animals/520x260/decorator_crab.jpg" rel="nofollow">storage.montereybayaquarium.org/storage/animals/520x260/d...</a>). Xenophorids are principally detritivores and occur on unconsolidated, fine-grained to coarse-grained to rubbly substrates. From museum signage: "The worldwide family of carrier-shells has for millions of years had a natural habit of attaching other shells and small objects to themselves. The family name, Xenophoridae, means "bearer" (phora) of "foreigners" (xeno). Of the 20 known living species, three live in the Caribbean Province, one in the Mediterranean, one in West Africa, and the remaining 15 in the Indo-Pacific oceans. Carrier shells will attach nearly any object within their reach. A choice of size and orientation is deliberately made. Only dead bivalves are selected and are always glued with the concave side up. Dead gastropods are always glued at the smaller, pointed end. A carrier-shell may take an hour to move an object into position with its proboscis. As many as 10 hours are taken to secrete enough new shell material to successfully "glue on" the new item." Classification: Animalia, Mollusca, Gastropoda, Xenophoroidea, Xenophoridae Some info. from Harasewych & Alcosser (1991) and Hill (1996). More info. at: <a href="https://en.wikipedia.org/wiki/Xenophora" rel="nofollow">en.wikipedia.org/wiki/Xenophora</a> |
Petsa | |
Gigikanan | Xenophora granulosa granulosa (granulose carrier snail) 2 |
Tagsulat | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/24649717291. It was reviewed on 22 Oktubre 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
22 Oktubre 2019
Items portrayed in this file
depicts English
creator English
some value
copyright status English
copyrighted English
copyright license English
5 Enero 2016
source of file English
file available on the internet English
captured with English
Canon PowerShot D10 English
exposure time English
0.01666666666666666666 second
f-number English
10
focal length English
9.681 millimetre
ISO speed English
80
media type English
image/jpeg
instance of English
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Petsa/Takna | Thumbnail | Mga dimensyon | Tiggamit | Komento | |
---|---|---|---|---|---|
kasamtangan | 03:46, 22 Oktubre 2019 | 2,670 × 2,368 (2.95 MB) | Rudolphous | Transferred from Flickr via #flickr2commons |
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Metadata
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/60 sec (0.016666666666667) |
F Number | f/10 |
ISO speed rating | 80 |
Date and time of data generation | 17:40, 5 Enero 2016 |
Lens focal length | 9.681 mm |
Image title | |
Width | 4,000 px |
Height | 3,000 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 22:09, 31 Enero 2016 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 17:40, 5 Enero 2016 |
Meaning of each component |
|
Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 6.65625 |
APEX exposure bias | −0.33333333333333 |
Maximum land aperture | 3.625 APEX (f/3.51) |
Metering mode | Pattern |
Flash | Flash fired, compulsory flash firing, red-eye reduction mode |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,460.905349794 |
Focal plane Y resolution | 16,483.516483516 |
Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Portrait |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 15:09, 31 Enero 2016 |
Unique ID of original document | C5647DC8548F744ABDA750164502C223 |
IIM version | 1 |