42 Differentiation L. obtusata/L. fabalis

42 Differentiation L. obtusata/L. fabalis

L. obtusata.
Graham (1988) states that “a notch where the outer lip and last whorl meet” (1) is indicative of young L. obtusata. It diminishes or disappears when the lip drops down the penultimate whorl and a domed spire is formed (2). A notch is not a reliable indicator of species (D. Reid, in litt.).
Menai Strait, North Wales. September 2016.
Full account at: 02 Differentiation L. obtusata/L. fabalis

marinvert.senckenberg.science/image-browse/