Habitat: it lives in the deep circalittoral zone, on slimy bottoms.
Distribution: it is known in a large part of the Mediterranean, where it is rather rare.
Notes: shell brittle, small in sizes, equivalve, inequilateral, oval in outline, valves convex, surface either smooth or with a few fine growth striae. Sometimes it is covered by ferrugineous deposits. One very weak fold corresponds with a slight angularity in the posterior part, while anteriorly it is roundish. Ventral zone roundish but a little bit flattened, antero-dorsal margin prominent. Umbo placed posteriorly, not much protuberant. Lunule extended but not much defined. Ligament, just visible externally, placed not far from posterior margin. Outline of juvenile specimens not very different from the adults one. This species, among its similar ones living in the Mediterranean, can be mistaken with T oblonga. However this one has a different outline due to one subacute angle in the posterior part and to a fine denticulation on the dorsal margins. Payne & Allen (1991) describe a subspecies minuta in the Atlantic depths, in front of Angola and Namibia coasts. The average measures are around 1.5 mm in width.