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Heterostraci1.gif (405 × 326 pixels, file size: 36 KB, MIME type: image/gif)

Summary

Description
English: Heterostracans are the most diverse group of pteraspidomorphs and lived during the Silurian and Devonian periods. Among the most primitive heterostracans are tolypelepids (top right). Most heterostracans are pteraspidiforms, such as the pteraspidids (bottom right), protopteraspidids (bottom left) and the huge psammosteids (top left), which are the youngest known members of the group.
Date
Source http://tolweb.org/Heterostraci/16904
Author Philippe Janvier

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Date/TimeThumbnailDimensionsUserComment
current12:30, 22 January 2009Thumbnail for version as of 12:30, 22 January 2009405 × 326 (36 KB)Haplochromis{{Information |Description={{en|1=Heterostracans are the most diverse group of pteraspidomorphs and lived during the Silurian and Devonian periods. Among the most primitive heterostracans are tolypelepids (top right). Most heterostracans are pteraspidifor

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