Lissodendoryx (Ectyodoryx) foliata (Fristedt, 1887) is a small leaf-shaped sponge with smooth surface and soft, fragile consistency. Its live colour is unknown. It is an ill-known deep water species.
Colour: Grey in alcohol.
Shape, size, surface and consistency: Leaf-shaped. Height up to 3.5 cm, thickness 3 mm. Surface even and smooth. Oscules numerous, small. Consistency fragile, soft.
Spicules: Megascleres: Ectosomal tornotes, tylote-like with unequal mucronated heads: 200 µm; acanthostyles possibly in two size classes, entirely but weakly spined: 130-300 µm. Microscleres: Arcuate isochelae, strongly but evenly curved: 35 µm; sigmas: 20 µm.
Skeleton: Not recorded. Presumably, tornotes form brushes at the surface; choanosomal skeleton should be a reticulation of bundles of acanthostyles.
Ecology: Deep water, 70-1948 m.
Distribution: Norway; North Atlantic, Arctic; also recorded from South Africa.
Etymology: The name refers to the leaf-shaped habit.
Type specimen information: No data.
The skeleton of this species is not properly known. We could only use Lundbeck's (1909) interpretation of the type as a basis for the description.
The two other sympatric Lissodendoryx (Ectyodoryx) species, L. (E.) atlantica and L. (E.) multiformis, differ substantially in shape (thinly encrusting in atlantica) and spicule sizes and categories (megascleres twice as long in atlantica; several categories of microscleres in multiformis).
Source: Arndt, 1935