Phaedusa filicostata compressa Loosjes, 1953  

Loosjes (1953) original descriptions on Phaedusa filicostata compressa – “Shell of medium size, usually smaller than subsp. tenuicosta, but comparatively broader, it has a plump appearance, very fragile, yellowish-brown, the lateral outlines are straight or slightly convex (the holotype). The rather short spire is rapidly but regularly tapering to the embryonic whorls, they form no separate top, as is often the case in the subsp. tenuicosta. Whorls 9 to 11, usually 10, rather convex. There may be a thread along the suture (the holotype e.g.). About 15 transverse, wavy striae are counted to the mm on the whorl above the aperture, they are but slightly coarser on the neck. The last whorl is short, the neck is strongly curved towards the base of the peristome. The aperture is very broad at its base, especially the right angle bulges out. The plane in which the peristome lies is not parallel with the axis of the shell, because the basal part of the peristome is receding. The closing apparatus lies between the dorsal and the right side. The plica palatalis principalis ends at the right side, for the rest the lamellae and plicae show no important differences with those of tenuicosta. The dimensions of the plate of the clausilium are 1.7 by 2.7 mm.”