File:Three toed (Bradypus variegatus) and Two toed (Choloepus hoffmanni) Sloths (5332567654).jpg
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Summary
[edit]DescriptionThree toed (Bradypus variegatus) and Two toed (Choloepus hoffmanni) Sloths (5332567654).jpg |
English: The three and two toed sloths belong in different genera, and in fact, different families (Bradypodidae and Megalonychidae) within the sloth suborder of Folivora. The three toed sloths are actually the most basal lineage of the sloth radiation, with all of the known giant ground sloths (represented by multiple families) being more closely related to the two toed sloth. In fact, Megalonychidae harbored many giant ground sloth species itself. Thus, what you see here are two relics of a once highly diverse group of herbivorous mammals, most of which were giant, heavily clawed ground dwelling herbivores that could reach to the size of modern African elephants and lived from the high reaches of snowy North American boreal forests, to the desert shores of South America (where there were actually aquatic forms that probably lived like modern marine iguanas).
These two skulls in particular belong in the collections of the Biology Department at Centenary College of Louisiana and were collected in Costa Rica (likely by or in association with Dr. Brad McPherson). Note that the jugal is broken off of the Bradypus skull, otherwise you would see a rather flamboyant, incomplete zygmoatic process, just as with the Choloepus skull, only with a higher dorsal process. Also, the Choloepus skull is lacking all of its post-caniniform and lower caniniform teeth (and I mean caniniform, not canine. It is believed that the caniniform teeth of sloths are actually just premolars or molars. The fact that the lower caniniform is posterior to the upper is a rather glaring reason why, as in all mammals with canines, the lower is always anterior to the upper canine). |
Date | |
Source | Three toed (Bradypus variegatus) and Two toed (Choloepus hoffmanni) Sloths |
Author | Dallas Krentzel |
Camera location | 32° 29′ 00.49″ N, 93° 43′ 51.47″ W | View this and other nearby images on: OpenStreetMap | 32.483470; -93.730963 |
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Licensing
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This image was originally posted to Flickr by Dallas Krentzel at https://flickr.com/photos/31867959@N04/5332567654. It was reviewed on 15 May 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
15 May 2021
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current | 09:27, 15 May 2021 | 3,872 × 2,592 (3.01 MB) | Sentinel user (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Image title | SONY DSC |
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Camera manufacturer | SONY |
Camera model | DSLR-A300 |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/5 |
ISO speed rating | 400 |
Date and time of data generation | 14:42, 6 December 2010 |
Lens focal length | 60 mm |
Orientation | Normal |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | DSLR-A300 v1.00 |
File change date and time | 14:42, 6 December 2010 |
Y and C positioning | Co-sited |
Exposure Program | Normal program |
Exif version | 2.21 |
Date and time of digitizing | 14:42, 6 December 2010 |
Meaning of each component |
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Image compression mode | 8 |
APEX brightness | 3.5 |
APEX exposure bias | 0 |
Maximum land aperture | 4.64 APEX (f/4.99) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
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 |
Focal length in 35 mm film | 90 mm |
Scene capture type | Standard |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |