Dondersiidae sp. A

(Figure 8, Table 2)

Examined material. DZMB-HH-4795-05 (DZMB-Senckenberg Biozentrum Grindel und Zoologische Museum). Serial sections (12 slides) and sclerite preparations (five slides). Guinea Basin. DIVA 2 Me 63/2, area 4, station 90 (00º 40.49’N, 05º 29.71’W), 5144 m depth .

Description. Elongate animal (4.85 mm long, 0.3 mm wide in the middle region), with the anterior end slightly widened. Scaly in appearance, it is yellowish-white in 70 % ethanol with brownish spots (Figure 8 A). Pedal groove, pedal pit and apertures of the common atrio-buccal cavity and the terminal mantle cavity are externally visible. With leaf-shaped scales and laminar scales: 1) Leaf-shaped scales with a long and narrow acuminate end (91 to 108 μm long, 36 to 49 μm wide.; Figure 8 A-1). 2) Leaf-shaped scales slightly oval (62 to 97 μm long, 25 to 98 μm wide.; Figure 8 A-2). 3) Laminar scales (4 to 61 μm long, 7.5 to 11.5 μm wide; Figure 8 A-3, 4) that are concentrated mainly in the dorsal region.