Clionolithes cervicornis (Vogel, Golubić et Brett, 1987)

Microboring; substrate calcareous; tracemaker invertebrate?

Emended diagnosis. Branches with nearly constant diameter diverge from the main trunk, spreading and bifurcating radially in straight or slightly curved lines, adhere closely to the substrate surface and do not anastomose. They have smooth and rounded surfaces and rounded, rarely pointed tips.

Diagnosis. - Rosette-shaped repeatedly branched systems up to 2.5mm (1.50 f 0.40 [lo]) in diameter. Branches diverge from the main trunk (Fig. 5B, top), spreading radially in straight line or slightly curved, at angles ranging from 40" to 95" (64 f 13 [50]). The main trunk is 80-250 μm wide. The primary branches (those proximal to the trunk) are 60-225 μm (133 f 44 [24]) wide, the distal branches are 25-85 μm (52 f 11 [loo]) wide. The branches often adhere closely to the substrate surface (Fig. 5C). They have smooth and rounded surfaces, and are circular in cross section. They do not taper and have rounded, rarely pointed tips. Branch diameter decreases only slightly from primary to secondary and tertiary (distal) branches, and remains constant (or even increases slightly) between branching points. The branching varies in density, without anastomoses. The main aperture to the surface was not detected.