Chamaesipho grebneffi is the first extinct member of the Notochthamalinae to be described, and the oldest chthamaloid barnacle known.

Three extinct species of Chthamalus from the middle Miocene of the faluns of Touraine, France were described in 2008 by Carriol.

Like the three living species of Chamaesipho, the shell of C. grebneffi begins with 6 plates, fusing completely at about 2 mm diameter.

Chamaesipho grebneffi is interpreted, from wear patterns on the shell, to have occupied high littoral positions on shore.

Entire assemblage described by Buckeridge indicates shallow agitated waters of several habitat zones.