File:Harpactoxanthopsis_quadrilobata_fossil_crab_IT.jpg
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Summary
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
Items portrayed in this file
depicts
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13 August 2007
0.01666666666666666666 second
5.6
170 millimetre
File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 22:25, 20 September 2014 | 3,008 × 2,000 (3.11 MB) | Tillman | Transferred from Flickr via Flickr2commons |
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Metadata
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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 |
Exposure bias | 0 |
Maximum land aperture | 5 APEX (f/5.66) |
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Light source | Unknown |
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DateTime subseconds | 70 |
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DateTimeDigitized subseconds | 70 |
Supported Flashpix version | 1 |
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Supported Flashpix version | 1 |
Image width | 3,008 px |
Image height | 2,000 px |
Date metadata was last modified | 11:19, 20 September 2014 |