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Keywords:

  • Autecology;
  • Gastropods;
  • Euomphalacea;
  • Omphalotrochidae;
  • Labrocuspis;
  • infauna;
  • suspension-feeding;
  • Devonian

Labrocuspis kobayashii, a Middle Devonian euomphalacean omphalotrochid gastropod from Japan has a wide callus pad on its base similar to that seen in the living trochid Umbonium. L. kobayashii could support the shell over the cephalopedal mass in a similar fashion to that seen in the Umbonium species. This reconstruction indicates that the labral projection in the outer lip was above the head, and the opisthocyrt basal lip and the sinus in the outer lip were loci of inhalant and exhalant currents, respectively. Therefore, the animal is assumed to have had only one ctenidium (the left). The presence of a wide callus pad is indicative of an infaunal life habit for the Umbonium species, Labrocuspis and some Paleozoic gastropods; clamping of the shell against the foot is also suggested for some omphalotrochid gastropods. These features indicate an additional adaptive strategy employed by euomphalaceans.