Eiffelospina candelabrum (Thomsen, 1978)
Basionym: Pinaciophora candelabrum Thomsen (1978)
Synonym: Rabdiophrys candelabrum Roijackers and Siemensma, 1988

Diagnosis: Periplast approximately 30 × 30 µm when flattened, covered with two kinds of scales. Details of the protoplast are unknown. Plate scales circular to oval, occasionally with a median constriction, with dimensions ranging from 2.0 to 3.1 µm. The distal scale surface is perforated by 6–8 larger pores of varying size, occupying the central region of the scale. Between these larger pores and a conspicuous patternless rim, the distal surface is perforated by minute, hexagonally arranged holes. The lower plate—visible through the larger perforations of the distal plate—shows a rather indistinct pattern of minute perforations. The two plates of the scale are fused peripherally and elsewhere connected by intercalary material appearing as black dots, sometimes in a distinct hexagonal arrangement.

Spine scales (2–9 µm long, approximately 0.8 µm wide at the base) are flattened distally into a bifurcate tip. Decurrent ridges, mutually connected by irregularly perforated scale material, are proximally attached by several struts to a basket‑like scale base with perforations arranged in distinct lines. The transition from the spine proper to the scale base shows some variation; in some cases it resembles a banister encircling a depression from which the spine emerges.

Ecology and distribution: Surface water sample, Dybsø fjord (Denmark).