Bioclaustration structures

Catellocaulata Palmer et Wilson, 1988

Taxon description

Palmer & Wilson, 1988

Diagnosis: Bioclaustration structure in bryozoans, consisting of a group of pits sunk into the surface of zoarium. Pits c. 2 mm diameter, up to c. 2 mm deep; in plain view pit mouth  subcircular to oval with slightly to strongly fluted edges; pit walls may extend up above bryozoan surface to form low thickened rim around pit mouth. Mature specomens consist of arrays of up yo thirty or more such pits; in centre af array, pits spacd evenly, c 2-3 mm apart; towards periphery, pits lie equispaced along strait or gently curving lines, each often terminating in a groove, c 2 mmwide, several millimetres long; groove shallows distally so that outer end merges imperceptibly with surface of surrounding zoarium. Floors of adjacent pits along line joined by tunnels, c 2mm wide, 0,5 mm high. Lines increase in  number by bifurcation.

Selection of related publications
Palmer, T. J., Wilson, M. A. 1988. Parasitism of Ordovician bryozoans and the origin of pseudoborings. Palaeontology 31, 4, 939-949.
References based on distribution