File:Lopha cristagalli (cockscomb oyster) 4.jpg
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[edit]DescriptionLopha cristagalli (cockscomb oyster) 4.jpg |
English: Lopha cristagalli (Linnaeus, 1758) - cockscomb oyster (public display, Bailey-Matthews Shell Museum, Sanibel Island, Florida, USA)
Bivalves are bilaterally symmetrical molluscs having two calcareous, asymmetrical shells (valves) - they include the clams, oysters, and scallops. In most bivalves, the two shells are mirror images of each other (the major exception is the oysters). They occur in marine, estuarine, and freshwater environments. Bivalves are also known as pelecypods and lamellibranchiates. Bivalves are sessile, benthic organisms - they occur on or below substrates. Most of them are filter-feeders, using siphons to bring in water, filter the water for tiny particles of food, then expel the used water. The majority of bivalves are infaunal - they burrow into unlithified sediments. In hard substrate environments, some forms make borings, in which the bivalve lives. Some groups are hard substrate encrusters, using a mineral cement to attach to rocks, shells, or wood. The fossil record of bivalves is Cambrian to Recent. They are especially common in the post-Paleozoic fossil record. The cockscomb oyster, Lopha cristagalli, is a distinctive bivalve that occurs in shallow marine reef environments of the Indian Basin and Pacific Basin. Fossil oysters assigned to Lopha are known starting in the Triassic. The cockscomb oyster is part of the Indo-West Pacific Province: "The world's largest and richest province extends from the Red Sea and East Africa across the Indian Ocean, then touches northern Australia and southern Japan to extend eastward throughout the "South Seas" to Hawaii and Easter Island. Probably 5,000 marine species are found in its shallow coral waters." [info. from museum signage] Classification: Animalia, Mollusca, Bivalvia, Pteriomorphia, Ostreoida, Ostreidae Locality: unrecorded/undisclosed/unspecified More info. at: en.wikipedia.org/wiki/Cockscomb_oyster |
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Source | https://www.flickr.com/photos/47445767@N05/24944288576/ |
Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/24944288576 (archive). It was reviewed on 5 March 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
5 March 2020
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current | 18:20, 5 March 2020 | ![]() | 2,044 × 2,451 (3.23 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/24944288576/ with UploadWizard |
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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/4.9 |
ISO speed rating | 80 |
Date and time of data generation | 16:23, 3 January 2016 |
Lens focal length | 18.6 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 23:52, 11 February 2016 |
Y and C positioning | Centered |
Exif version | 2.21 |
Date and time of digitizing | 16:23, 3 January 2016 |
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APEX shutter speed | 5.9068905902692 |
APEX aperture | 4.5855635130041 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 4.5855635130041 APEX (f/4.9) |
Metering mode | Pattern |
Flash | Flash fired, compulsory flash firing, red-eye reduction mode |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,460.905405405 |
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 | 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 | 16:52, 11 February 2016 |
Unique ID of original document | 5EA19C1985252927F072CFC36DCDD8B6 |