File:Cenchritis muricatus (beaded periwinkle snails) Bahamas.jpg
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Summary
[edit]DescriptionCenchritis muricatus (beaded periwinkle snails) Bahamas.jpg |
Tectarius muricatus (Linnaeus, 1758) - beaded periwinkle snails on phytokarst. These snails are on a phytokarst surface of aragonitic calcarenite limestones of the Hanna Bay Member (upper Rice Bay Formation, middle to upper Holocene). They are supratidal rocky shore bacteria/algae grazers. The jagged, pitted rock surface is phytokarst, formed by limestone being subjected to slow, partial dissolution by the life activities of bacteria and algae that coat the surfaces (= dark gray films). The snails are feeding on these biofilms by using their radulas to scrape away at the substrate. Phytokarst is one type of epikarst - limestone dissolution features at the top of the vadose zone. Classification: Animalia, Mollusca, Gastropoda, Littorinidae Locality: rocky cliffs along southern shoreline of Graham’s Harbour, just west of Bahamas Field Station, northern margin of San Salvador Island, eastern Bahamas |
Date | |
Source | Tectarius muricatus (beaded periwinkle snails) on phytokarst (San Salvador Island, Bahamas) 4 |
Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/15382863483. It was reviewed on 28 December 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
28 December 2014
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current | 02:25, 28 December 2014 | 3,008 × 2,000 (2.04 MB) | Tillman (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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Camera manufacturer | NIKON CORPORATION |
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Camera model | NIKON D70s |
Exposure time | 1/250 sec (0.004) |
F-number | f/7.1 |
Date and time of data generation | 07:38, 19 June 2010 |
Lens focal length | 200 mm |
Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 00:42, 12 December 2014 |
Y and C positioning | Co-sited |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 07:38, 19 June 2010 |
Meaning of each component |
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Image compression mode | 4 |
APEX exposure bias | 0 |
Maximum land aperture | 5 APEX (f/5.66) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire |
DateTime subseconds | 90 |
DateTimeOriginal subseconds | 90 |
DateTimeDigitized subseconds | 90 |
Supported Flashpix version | 1 |
Color space | sRGB |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 300 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Supported Flashpix version | 1 |
Image width | 3,008 px |
Image height | 2,000 px |
Date metadata was last modified | 19:42, 11 December 2014 |