File:Rhipocephalus phoenix (pinecone alga) (San Salvador Island, Bahamas).jpg
![File:Rhipocephalus phoenix (pinecone alga) (San Salvador Island, Bahamas).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/c/c0/Rhipocephalus_phoenix_%28pinecone_alga%29_%28San_Salvador_Island%2C_Bahamas%29.jpg/800px-Rhipocephalus_phoenix_%28pinecone_alga%29_%28San_Salvador_Island%2C_Bahamas%29.jpg?20141228015307)
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[edit]DescriptionRhipocephalus phoenix (pinecone alga) (San Salvador Island, Bahamas).jpg |
Rhipocephalus phoenix (Ellis & Solander, 1786) - pinecone alga on shallow, aragonitic sandy seafloor. Rhipocephalus is a calcareous green alga - the nested circlets of flattened blades have tiny particles of aragonite (CaCO3 - calcium carbonate). After the alga dies and the soft parts decay away, the aragonitic portions become clay- & silt-sized seafloor sediments. A significant percentage of shallow seafloor and shoreline sediments in the Bahamas is from calcareous algae. Many carbonate petrologists suggest that ancient fine-grained limestones (micritic limestones; micrites) are diagenetically altered deposits of calcareous green algae. The pale green cup-on-a-stalk on the right side of the photo is Acetabularia, the Mermaid's wine-glass alga. The fuzzy whitish-green organism behind & to the left of the pinecone alga at center is Batophora, a dasyclad green alga. Classification of Rhipocephalus: Chlorophyta, Bryopsidales, Udoteaceae Locality: shallow seafloor just west of North Point Peninsula, southeastern Graham's Harbour, northeastern San Salvador Island, eastern Bahamas |
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Date | ||||
Source | Rhipocephalus phoenix (pinecone alga) (San Salvador Island, Bahamas) 1 | |||
Author | James St. John | |||
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This image, originally posted to Flickr, was reviewed on 28 December 2014 by the administrator or reviewer Leoboudv, who confirmed that it was available on Flickr under the stated license on that date. |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 01:53, 28 December 2014 | ![]() | 1,863 × 1,359 (807 KB) | Tillman (talk | contribs) | Cropped 36 % horizontally and 27 % vertically using CropTool with lossless mode. |
01:51, 28 December 2014 | ![]() | 2,928 × 1,868 (1.56 MB) | Tillman (talk | contribs) | {{Information |Description=Rhipocephalus phoenix (Ellis & Solander, 1786) - pinecone alga on shallow, aragonitic sandy seafloor. Rhipocephalus is a calcareous green alga - the nested circlets of flattened blades have tiny particles of aragonite (CaCO3... |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/500 sec (0.002) |
F-number | f/4.5 |
ISO speed rating | 80 |
Date and time of data generation | 09:42, 22 June 2010 |
Lens focal length | 14.3 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 01:23, 18 December 2014 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 09:42, 22 June 2010 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 8.9686668031948 |
APEX aperture | 4.3398500267809 |
APEX exposure bias | 0 |
Maximum land aperture | 4.3398500267809 APEX (f/4.5) |
Metering mode | Pattern |
Flash | Flash did not fire, auto mode |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,460.905405405 |
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 | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Night scene |
Supported Flashpix version | 1 |
Image width | 2,928 px |
Image height | 1,868 px |
Date metadata was last modified | 20:23, 17 December 2014 |
IIM version | 2 |