High Quality Content by WIKIPEDIA articles! Wardoceras is an extinct nautiloid genus from the late Early Ordovician of Western Utah, assigned to the orthocerid family, MichelinoceratidaeShells of Wardoceras are smooth and orchoconic, with a circular cross section and small subcental siphuncle, the segments of which are ventrally straight and dorsally slightly expanded into the camerae. The siphuncle is completely encircled internally by a thin lining that thickens and thins rhythmically so as to slightly thicken just forward of the septal necks, suggesting an origin in annular deposits. Cameral deposits are well developed and are thick,almost filling the ventral portion of the more apical chambers but also found in dorsal chambers as well.

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