Species Semilaoma costata Shea & Griffiths, 2010

Semilaoma costata, dorsal view. Diameter of shell: 1.6mm.

© Copyright John Stanisic BAAM Pty Ltd, Queensland.

Semilaoma costata, ventral view.

Museums

Regional Maps

• Semilaoma costata Shea, M. & Griffiths, O. in Stanisic, J., Shea, M., Potter, D. & Griffiths, O. 2010. Australian Land Snails. A field guide to eastern Australian species. Mauritius : Bioculture Press Vol. 1 595 pp. [180, 566] [etymology: from the Latin costa = rib, referring to the prominent radial ribs].

  Type data:

   Holotype AM SC390081, Lord Howe Island, between Pebbly Beach and North Beach on calcarenite ridge (=Curtis Stn 3) [31˚31.150'S, 159˚2.730'E].
  Paratype(s) AM AMSC390102; AM SC390085; AM SC390103.

Introduction

Semilaoma costata is distinguished from S. lidgbirdensis and S. laevis by the combination of flatter shape, coarser sculpture and comparatively widely open umbilicus. Common and widespread.

Distribution

Extra Distribution Information

Australian Endemic.

Other Regions

Lord Howe Island terrestrial & freshwater

Distribution References

Ecological Descriptors

Forest, litter-dwelling, lowland, scrub.

Extra Ecological Information

Drypetes/Cryptocarya forest and palm plantation, calcarenite soil and humus

Diagnosis

Shell minute, pale yellow to white, subdiscoidal with a low to flat spire and bluntly angular whorls; protoconch with fine spiral lirae, teleoconch sculpture of irregular, closely spaced radial ribs and fine spiral lirae; umbilicus moderately open; diameter 1.6mm.

Diagnosis References

Stanisic, J., Shea, M., Potter, D. & Griffiths, O. 2010. Australian Land Snails. A field guide to eastern Australian species. Mauritius : Bioculture Press Vol. 1 595 pp. [180]

General References

Stanisic, J., Shea, M., Potter, D. & Griffiths, O. 2010. Australian Land Snails. A field guide to eastern Australian species. Mauritius : Bioculture Press Vol. 1 595 pp. [180]

Common Name References

Stanisic, J., Shea, M., Potter, D. & Griffiths, O. 2010. Australian Land Snails. A field guide to eastern Australian species. Mauritius : Bioculture Press Vol. 1 595 pp. [180] (Coarse-ribbed Pinhead Snail)

History of changes