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 growthlines 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:...
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http://en.wikipedia.org/wiki/Atrypa
• (n.) A extinct genus of Branchiopoda, very common in Silurian limestones.
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http://thinkexist.com/dictionary/meaning/atrypa/
genus of extinct brachiopods, or lamp shells, that has a broad time range and occurs abundantly as fossils in marine rocks from the Silurian through ...
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http://www.britannica.com/eb/a-z/a/121
A·try'pa noun [ New Latin , from Greek
'a priv. + ... a hole.]
(Paleon.) A extinct genus of Branchiopoda, very common in Silurian limestones.
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http://www.encyclo.co.uk/webster/A/141
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