Under stones, with micro-algae, low tide level. |
21mm. In broken part of the wall, under stones, harbour-side. Pattern and colours tend to be darker and blurred, contrasts vanish. A crepuscular shell. |
The general shape is now clearly rounded. In this place, lips are often a bit chipped. |
Dominant species in the spot |
Gibbula cineraria (Linnæus, 1758) 13-14mm. On stones, in the water. Always the form "elatior". Variations affect sculpture (spiral ribs less or more widely spaced), height, shape, and pattern. For example, there is a variant named "variegata" Jeffreys 1865, in which the sutural band is crowned, like in many C. zizyphinum , by an alternance of dark and light coloured rectangular marks. |
Linnæus placed this species in the genus Trochus. Cinerarius. 512. T. testa oblique umbilicata ovata, anfractibus rotundatis. Habitat in M. Mediterraneo. testa cinerea fasciis obliquis pallidis. (Syst. Nat. X / Vermes / Testacea p.758). This kind of description covers many species of Gibbulas, like pennanti, philberti, rackettii, umbilicalis, and even some varia... |