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- Astraspida abstract "Astraspida, or astraspids, are a small group of fossil, armored, fossil jawless vertebrates, which lived in the Middle Ordovician (about 450 million years ago) in North America. They are placed among the Pteraspidomorphi because of the large dorsal and ventral shield of their head armor. They are represented by a single genus, Astraspis, including possibly two species, A. desiderata and A. splendens but their remains are fairly abundant in Ordovician sandstones of the USA (Colorado, Arizona, Oklahoma, Wyoming) and Canada (Quebec). The head armor of Astraspis is rather massive, with a series of ten gill openings lining the margin of the dorsal shield, and laterally placed eyes. The dorsal shield is ribbed by strong longitudinal crests, and the tail is covered with large, diamond-shaped scales. They are often grouped together with the Arandaspidida.".
- Astraspida class Pteraspidomorphi.
- Astraspida kingdom Animal.
- Astraspida phylum Chordate.
- Astraspida thumbnail Astraspis_desiderata.gif?width=300.
- Astraspida wikiPageID "8609454".
- Astraspida wikiPageRevisionID "578876611".
- Astraspida classis "†Pteraspidomorphi".
- Astraspida fossilRange Ordovician.
- Astraspida hasPhotoCollection Astraspida.
- Astraspida imageCaption "An Astraspis".
- Astraspida ordo "Astraspida".
- Astraspida ordoAuthority "Berg, 1940".
- Astraspida phylum Chordate.
- Astraspida regnum "Animalia".
- Astraspida subclassis "†Heterostracomorphi".
- Astraspida subdivision "†Astraspidiformes (Berg, 1940)".
- Astraspida subdivision "†Tesakoviaspidida (Talimaa & Moya, 2004)".
- Astraspida subdivisionRanks "Subgroups".
- Astraspida subject Category:Ordovician_fish.
- Astraspida subject Category:Pteraspidomorphi.
- Astraspida type Animal100015388.
- Astraspida type Chordate101466257.
- Astraspida type LivingThing100004258.
- Astraspida type Object100002684.
- Astraspida type Organism100004475.
- Astraspida type PhysicalEntity100001930.
- Astraspida type PrehistoricVertebrates.
- Astraspida type Vertebrate101471682.
- Astraspida type Whole100003553.
- Astraspida type Animal.
- Astraspida type Eukaryote.
- Astraspida type Species.
- Astraspida type Organism.
- Astraspida comment "Astraspida, or astraspids, are a small group of fossil, armored, fossil jawless vertebrates, which lived in the Middle Ordovician (about 450 million years ago) in North America. They are placed among the Pteraspidomorphi because of the large dorsal and ventral shield of their head armor. They are represented by a single genus, Astraspis, including possibly two species, A. desiderata and A.".
- Astraspida label "Astraspida".
- Astraspida sameAs m.073g77.
- Astraspida sameAs Q14524396.
- Astraspida sameAs Q14524396.
- Astraspida sameAs Astraspida.
- Astraspida wasDerivedFrom Astraspida?oldid=578876611.
- Astraspida depiction Astraspis_desiderata.gif.
- Astraspida isPrimaryTopicOf Astraspida.
