File:Galeaspida.gif
From Wikimedia Commons, the free media repository
Jump to navigation
Jump to search
Galeaspida.gif (303 × 302 pixels, file size: 32 KB, MIME type: image/gif)
File information
Structured data
Captions
Summary
[edit]DescriptionGaleaspida.gif |
English: Galeaspids are known from the Silurian and Devonian of China and Vietnam. They are characterized by a large, median dorsal inhalent opening and a scallopped pattern of the sensory-lines. Their mouth and gill openings are situated on the ventral surface of the head (top right). In the most primitive forms, such as the Silurian genus Hanyangaspis (top), the median dorsal inhalent opening is broad and situated anteriorly. In other galeaspids, its is more posterior in position and can be oval, rounded, heart-shaped or slit-shaped. In some Devonian galeaspids, such as the hunanaspidiforms Lungmenshanaspis (middle) and Sanchaspis (bottom right), the headshield is produced laterally and anteriorly into slender processes. The eugaleaspidiforms, such as Eugaleaspis (bottom left) have a horseshoe-shaped headshield and a slit-shaped median dorsal opening, which mimates the aspect of the headshield of osteostracans. |
Date | |
Source | http://tolweb.org/Galeaspida/14839 |
Author | Philippe Janvier |
Licensing
[edit]This file is licensed under the Creative Commons Attribution 3.0 Unported license.
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 14:08, 22 January 2009 | 303 × 302 (32 KB) | Haplochromis (talk | contribs) | {{Information |Description={{en|1=Galeaspids are known from the Silurian and Devonian of China and Vietnam. They are characterized by a large, median dorsal inhalent opening and a scallopped pattern of the sensory-lines. Their mouth and gill openings are |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
File usage on other wikis
The following other wikis use this file:
- Usage on en.wikipedia.org
- Usage on it.wikipedia.org
- Usage on vi.wikipedia.org
- Usage on www.wikidata.org
- Usage on zh.wikipedia.org
Hidden category: