Table 6. Conch ontogeny of Stockumites subbilobatus (Münster, 1839) from Gattendorf.
dm conch shape whorl cross section shape whorl expansion
2 mm thickly discoidal; evolute (ww/dm ~ 0.55; uw/dm ~ 0.45) moderately depressed; moderately embracing (ww/wh ~ 1.90; IZR ~ 0.25) low (WER ~ 1.65)
5 mm thickly discoidal; evolute (ww/dm ~ 0.50; uw/dm ~ 0.50) moderately depressed; strongly embracing (ww/wh ~ 1.85; IZR ~ 0.35) low (WER ~ 1.50)
15 mm thinly pachyconic; subinvolute (ww/dm ~ 0.65; uw/dm ~ 0.15) weakly depressed; very strongly embracing (ww/wh ~ 1.25; IZR ~ 0.55) moderate (WER ~ 1.80)
30 mm thickly discoidal; involute (ww/dm ~ 0.50; uw/dm ~ 0.00) weakly compressed; very strongly embracing (ww/wh ~ 0.85; IZR ~ 0.50) moderate (WER ~ 1.90)