American Tree Sparrow

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Summary

DescriptionAstraspis desiderata.png	English: Astraspis desiderata. Astraspids are still poorly known but recent discoveries of partially complete specimens of Astraspis desiderata, from the Ordovician of Colorado, have considerably increased their knowledge. Their dorsal headshield is made up by large, polygonal bone units and the gill openings are situated more dorsally than in arandaspids.
Date	1997
Source	http://tolweb.org/Astraspida/16906
Author	Philippe Janvier

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Date/Time	Dimensions	User	Comment
22 January 2009, 13:35:32	354 × 250 (36834 bytes)	Haplochromis (talk · contribs)	{{Information \|Description={{en\|1=''Astraspis desiderata''. Astraspids are still poorly known but recent discoveries of partially complete specimens of Astraspis desiderata, from the Ordovician of Colorado, have considerably increased their knowledge. The

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current	14:28, 18 August 2014		354 × 250 (38 KB)	GifTagger	Bot: Converting file to superior PNG file. (Source: Astraspis_desiderata.gif). This GIF was problematic due to transparency and non-greyscale color table.

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