Heterostinia immanis
Schrammen, 1910
Heterostinia immanis occurs as irregular, thick-walled, funnel- or dish-shaped specimens that may exceed 300 mm in width.
The example shown here is peculiar by having a round hole at its base, which is surrounded by several short roots.
Spicules (megaclones) of Heterostinia immanis (after Schrammen, 1910)
Heterostinia obliqua
Benett, 1831
Heterostinia obliqua occurs as ear- or funnel-shaped structures similar to Heterostinia immanis, but differs from the latter by having thinner walls (6-10 mm) and by its generally smaller size.
Dermal and gastral side of an ear-shaped example of Heterostinia obliqua.
Gastral and dermal side of a broad, plicated, ear-shaped example of Heterostinia obliqua, showing some roots near the base.
Funnel-shaped specimen of Heterostinia obliqua, with slightly plicated wall and strongly lobate margin.