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Triceraspyris antarctica (Haecker, 1907)

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Shell of rather heavy construction, nut-shaped, with unequal rounded pores, generally smooth surface, and slight or pronounced sagittal constriction. Four large basal pores. Usually three basal feet, circular or three-bladed in section, of approximately the same length as the cephalis: of these, the unpaired one is usually simply latticed proximally, and in many specimens all three are forked distally. In a few specimens, secondary spines or a small amount of lattice-work are developed between the proximal parts of these basal feet. Sagittal ring approximately D-shaped, from which a short, free apical spine arises subapically, and a thorn-like vertical spine arises from the more curved part of the ring near the basal pores. In most specimens, two more thorn-like spines are present, one to either side of the apical part of the sagittal ring, and in some specimens several more thorns are scattered over the apical surface. Height of sagittal ring 63-90µ; maximum breadth of bilocular cephalis 80-125µ.
Riedel 1958











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