File:Pteraspis crouchi (fossil fish) (Lower Devonian; Herefordshire, England) (34234547416).jpg
Original file (1,976 × 1,016 pixels, file size: 1.82 MB, MIME type: image/jpeg)
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Summary
DescriptionPteraspis crouchi (fossil fish) (Lower Devonian; Herefordshire, England) (34234547416).jpg |
Pteraspis crouchi Lankester, 1865 - fossil fish from the Lower Devonian of Britain. (FMNH PF1424, Field Museum of Natural History, Chicago, Illinois, USA) Orientation: dorsal view of head shield; anterior is the left. Pteraspis is a fossil jawless fish with significant bony armour. The earliest fish lacked jaws. The first jawed fish are Ordovician in age, but they didn't become common until the Devonian. Jaws appeared by evolutionary modification of the anterior set of gill arches. Jawed fish have fewer pairs of gill arches than jawless fish. A few jawless fish still exist in modern oceans - hagfishes and lampreys. Classification: Animalia, Chordata, Vertebrata, Agnatha, Heterostraci, Pteraspidiformes, Pteraspididae Locality: unrecorded/undisclosed site in Herefordshire County, western England, southern Britain See info. at: <a href="https://en.wikipedia.org/wiki/Pteraspis" rel="nofollow">en.wikipedia.org/wiki/Pteraspis</a> |
Date | |
Source | Pteraspis crouchi (fossil fish) (Lower Devonian; Herefordshire, England) |
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@N05/34234547416 (archive). It was reviewed on 7 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
7 December 2019
Items portrayed in this file
depicts
some value
11 June 2010
0.01666666666666666666 second
5.6
135 millimetre
400
image/jpeg
1,906,203 byte
1,016 pixel
1,976 pixel
230d97dc123bf1237a5b8f602c3160bc4d1a743e
File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 19:03, 7 December 2019 | 1,976 × 1,016 (1.82 MB) | Ser Amantio di Nicolao | Transferred from Flickr via #flickr2commons |
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Metadata
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Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/5.6 |
ISO speed rating | 400 |
Date and time of data generation | 11:31, 11 June 2010 |
Lens focal length | 135 mm |
Width | 3,008 px |
Height | 2,000 px |
Bits per component |
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Number of components | 3 |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 23:13, 25 April 2017 |
Y and C positioning | Co-sited |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 11:31, 11 June 2010 |
Meaning of each component |
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Shutter speed | 5.906891 |
APEX aperture | 4.970854 |
Exposure bias | 0 |
Maximum land aperture | 5 APEX (f/5.66) |
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Light source | Unknown |
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DateTime subseconds | 20 |
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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 | 202 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Serial number of camera | 200638ad |
Lens used | 18.0-200.0 mm f/3.5-5.6 |
Date metadata was last modified | 19:13, 25 April 2017 |
Unique ID of original document | 2CEEA1F52EB38F2E8155659D3B3232D1 |