Polyopesia angustata
Schrammen 1902
Polyopesia angustata (incorrectly identified with Hexactinella Carter by Schrammen (1912); cf. Reid, 2004) is a very rare sponge, and the virtually complete example shown here is exceptionally large for its kind. It is a very narrow funnel with short roots at its base, but without a distinct stem.
The species exhibits a conspicuous surface pattern, made up of irregularly grouped, protruding and rimmed postica. The skeleton consists of a fairly regular hexactine network.
Polyopesia laevis ?
Schrammen 1912
Polyopesia laevis is a very rare species not previously reported from Misburg. The identification is uncertain, as long as no direct comparison with type material is possible.
The sponge consists of a thin-walled tapering tube, with strong roots at the base. The outer surface shows 2 different pore types: larger (1.5 mm) ones with a jagged outline, and smaller (less than 1 mm), more rounded ones in the areas between the larger pores. A regular alignment of the pores is not discernible.
This example of Polyopesia laevis ? is probably the best of its kind, with large parts of the top region preserved. Thus more mature specimens of the species tend to form umbrella-like heads, similar to Ventriculites radiatus or V. successor.