Talpina tenuis (Teichert, 1945)

Description: Tubes not exceeding 0.1 mm. diameter, branching freely, seldom straight, but mostly curved or sinuous. The tubes are found in dorsal valves of spiriferids which they enter from the outside. The entrances of neighbouring tubes are usually not more than 0.2 to 0.3 mm. apart. The net work of the tubes is very much finer than in Conchotrema tubulosa and in C. canna.