Unknown neomphalid W. Family Neomphalidae.

Unknown neomphalid WUnknown neomphalid W SEM

See Warén & Bouchet, 1989, page 88, figure 84, for SEM of a very similar protoconch

Size under dissecting microscope: 250-260µm
Size under compound microscope: 245-260µm
This is a moderately large protoconch with coarse reticulate sculpture over the proximal half of the shell. Under the dissecting microscope the sculpture sometimes appears lineate and the general outline of the shell is typical of peltospirids, but the reticulate sculpture is easily visible under the compound microscope. The aperture is straight and there is a wide rim, tapering toward the posterior edge of the aperture, visible under the light microscope. Warén & Bouchet, 1989, described a species with a very similar protoconch as Depressigyra planispira (later amended to Planorbidella planispira), but since later specimens of this species appear to have a different protoconch (A. Warén, pers. comm.), we have kept our original designation.
Pump EPR 1999-2000: Occasional
Pump EPR 2004: Frequent
Trap EPR 2004-2005: Occasional

Can be confused with

Pachydermia laevis
Pachydermia laevis. Unknown neomphalid W lacks the thickened aperture rim and its sculpture is coarser, less regular and limited to the proximal portion of the shell.
Unknown peltospirid 240µm is similar in size and shape, but has lineate sculpture, instead of reticulate. This may not be obvious viewed from the side, but when viewed from the top, one can see the edges of the lines if lineate sculpture is present.

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