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About: Atrypa     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : yago:WikicatPrehistoricInvertebrates, within Data Space : dbpedia.demo.openlinksw.com associated with source document(s)

Type: ThingEukaryoteAnimalyago:WikicatBrachiopodsanimaleukaryotespeciesyago:WikicatSilurianAnimalsyago:Animal100015388yago:Brachiopod102315487yago:Invertebrate101905661yago:LivingThing100004258yago:Object100002684yago:Organism100004475yago:PhysicalEntity100001930insectyago:Whole100003553yago:WikicatDevonianAnimalsyago:WikicatPrehistoricAnimalsOfAfricayago:WikicatPrehistoricAnimalsOfAsiayago:WikicatPrehistoricAnimalsOfEuropeyago:WikicatPrehistoricAnimalsOfNorthAmericayago:WikicatPrehistoricAnimalsOfOceaniayago:WikicatPrehistoricAnimalsOfSouthAmericayago:WikicatPrehistoricInvertebrates New Facet based on Instances of this Class

Atrypa is a genus of brachiopod with shells round to short egg-shaped, covered with many fine radial ridges (or costae), that split further out and growth lines perpendicular to the costae and 2-3 times wider spaced. The pedunculate valve is a little convex, but tends to level out or even become slightly concave toward the anterior margin (that is: opposite hinge and pedicle). The brachial valve is highly convex. There is no interarea (that is a flat area bordering the hinge line approximately perpendicular with the rest of the valve) in either valve. Atrypa was a cosmopolitan and occurred from the late Lower Silurian (Telychian) to the early Upper Devonian (Frasnian). Other sources expand the range from the Late Ordovician to Carboniferous, approximately from 449 to 336 Ma. A proposed new