Enige kanttekeningen bij de meest voorkomende Europese Cerithiopsis-soorten

The characters of the genus Cerithiopsis s.s. Forbes & Hanley, 1851 have been precised: the teleoconchwhorl with 3 rows of granulated spiral cords. Besides these, on the body-whorl 2 well separated and diverging, smooth spiral cords. The protoconch is multispiral, stiliform without any sculpture, or with minute axial scratches only, just below the sutures. The 4 most common ‘European’ species have been discussed. There are 2 formae of C. jeffreysi, both with very thin (within this genus) axial ribs and spiral lines, bordering rather spaced squares. C. minima with a white protoconch, could be confused with ’Cerithiopsis’ micalii (originally Dizoniopsis, but this is wrong). Cerithiopsis in brackets because the characters do not correspond to the characters of Cerithiopsis s.s. The differences have been explained: the ribbed protoconch and the regulary arranged spiral cords on the more paunchy teleoconch. C. tubercularis forma nana Jeffreys, 1867 is nothing more than the author has stated: ‘dwarf and spindle-shaped’. Within the variability of C. tubercularis a small and pupoid specimen only. The species, during 10s of years mentioned as C. nana, differs from C. tubercularis (and C. tubercularis forma nana) by its first spiral line, less developed than the second till the last teleoconch-whorl, with tubercles on the first and second spiral ‘sticked’ to each other and with a ‘messy’ suture. This species has to become nameless ( Cerithiopsis species A). A third dwarf is ’Cerithiopsis’ species B from northwest Africa. A species with a ribbed protoconch and a teleoconch exactly like those of Cerithiopsis species A, but with one single spiral cord on the base of the body-whorl. But this is not within the scope of this paper.