Rugosa

The Rugosa, also called the Tetracoralla, are an extinct order of coral that were abundant in Middle Ordovician to Late Permian seas. Solitary rugosans (e.g., Caninia, Lophophyllidium, Neozaphrentis, Streptelasma) are often referred to as horn corals because of a unique horn-shaped chamber with a wrinkled, or rugose, wall. Some solitary rugosans r...
Found on http://en.wikipedia.org/wiki/Rugosa

Rugosa

• (n. pl.) An extinct tribe of fossil corals, including numerous species, many of them of large size. They are characteristic of the Paleozoic formations. The radiating septs, when present, are usually in multiples of four. See Cyathophylloid.
Found on http://thinkexist.com/dictionary/meaning/rugosa/

Rugosa

Ru·go'sa noun plural [ New Latin See Rugose .] (Paleon.) An extinct tribe of fossil corals, including numerous species, many of them of large size. They are characteristic of the Paleozoic formations. The radiating septs, when present, are usually in multiples of four. See Cyatho...
Found on http://www.encyclo.co.uk/webster/R/103
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