Tibbs
Diagnosis: Skeleton of well-developed lenticular veil of tangential needles and of several hundred radial tubes. Tubes small, slender, thin-walled, slightly tapered distally, each with distal crown of 2 to 4 (generally 3) terminal branches, curved outward and upward. Distal end of each terminal branch with comparatively large, strongly silicified, cushion-like spathilla with 4 to 8 (generally 6 to 8) strong recurved teeth. Some spathillae with short, stout apical process.
Length: 1.2-1.4 mm. Width: 0.2-0.3 mm.