File:Harpactoxanthopsis quadrilobata fossil crab IT.jpg
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Summary
[edit]DescriptionHarpactoxanthopsis quadrilobata fossil crab IT.jpg |
Harpactoxanthopsis quadrilobata from the Eocene of Italy (public display, Orton Geology Museum, Ohio State University, Columbus, Ohio, USA). Classification: Animalia, Arthropoda, Crustacea, Malacostraca, Eucarida, Decapoda, Brachyura, Xanthoidea, Xanthidae Stratigraphy: Castelgomberto Formation, Lutetian Stage, lower Middle Eocene Locality: Venetia Region, northern Italy Crabs (= brachyuran decapod crustaceans) are found in Jurassic to Holocene sedimentary rocks. Complete or near-complete specimens are scarce. They have a relatively shortened carapace, compared to lobsters and crayfish, and have the abdominal section of the body turned underneath & essentially fused with the carapace. Small to large claws (chelae) occur at the distal ends of the 1st pair of appendages. Decapods have 5 pairs of appendages - 10 in all - “decapod” means “ten-legged”. Most crabs are marine (oceanic), but some forms are freshwater or terrestrial. Their feeding habits range from predation to scavenging to algal grazing to filter feeding, etc. |
Date | |
Source | Harpactoxanthopsis quadrilobata fossil crab (Castelgomberto Formation, Middle Eocene, Venetia Region, northern Italy) |
Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/15114049337. It was reviewed on 20 September 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
20 September 2014
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current | 22:25, 20 September 2014 | 3,008 × 2,000 (3.11 MB) | Tillman (talk | contribs) | Transferred from Flickr via Flickr2commons |
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Camera manufacturer | NIKON CORPORATION |
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Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/5.6 |
Date and time of data generation | 14:59, 13 August 2007 |
Lens focal length | 170 mm |
Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 15:19, 20 September 2014 |
Y and C positioning | Co-sited |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 14:59, 13 August 2007 |
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 fired, strobe return light detected, auto mode |
DateTime subseconds | 70 |
DateTimeOriginal subseconds | 70 |
DateTimeDigitized subseconds | 70 |
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 |
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White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 255 mm |
Scene capture type | Standard |
Scene control | Low gain up |
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 | 11:19, 20 September 2014 |