This genus is placed in the family Cystiscidae. It was previously in the family Marginellidae the margin snails. Both families are within the order Neogastropoda.
(Note: Gastropod taxonomy has been in flux for more than half a century, and this is especially true currently, because of new research in molecularphylogeny. Because of all the ongoing changes, different reliable sources can yield very different classifications.)
Habitat
Species in this genus live from the intertidal zone to 370 m in depth.
Shell description
In this genus the shell is minute to small. It can be uniformly colored or white, and the color can be patterned. The shell is moderately thick to thick. The spire is usually immersed. The lip of the aperture is thickened, and weakly to strongly lirate.
An external varix can be present or absent. There is a distinct siphonal notch present and a posterior notch is also present. The columella is multiplicate, with 4 to 13 plications plus parietal lirae.
Description of soft parts
The animal has long tentacles, and the siphon is also usually long. The mantle appears not to extend completely over the external shell surface.
Species
The separation between the genera Persicula and Gibberula is not well-defined. It is based on morphological differences with the larger species (showing a complex color pattern) belonging to Persicula, while the smaller species (showing a banded or uniform color pattern) belong to Gibberula. Many species with characteristics that fall between the two extremes, are ambiguous. Up to now (2010) there is no phylogenetic analysis to substantiate this rather arbitrary classification.[1]
According to the World Register of Marine Species (WoRMS), the following species with valid names are included within the genus Persicula :[1]
^Faber, M.J. (2006). "The genera Pachybathron and Persicula with the description of a new species of Persicula from French Guyana (Gastropoda: Cystiscidae)". Miscellanea Malacologica. 2 (2): 25–39.
^Petuch, E.J. (2002). "New deep water gastropods from the Bimini Shelf, Bimini Chain, Bahamas". Ruthenica. 12 (1): 59–72.
^Clover, P.W. (1972). "Two new species of Marginellidae from West Africa". Journal of Conchology. 27: 503–504.
^Boyer, F.; Neefs, J.; Wakefield, A. (1999). "A new species of Persicula from the Venezuelan region (Gastropoda: Cystiscidae)". Journal of Conchology. 36 (4): 15–20.
^Megerle von Mühlfeld, Johann Carl (1816). "Beschreibung einiger neuen [sic] Conchylien". Gesellschaft der Naturforschenden Freunde zu Berlin Magazin für die neuesten Entdeckungen in der gesammten Naturkunde. 8 (1): 3–11, pls 1-2. Retrieved 5 July 2020.
^ abCossignani, T. (2001). "Descrizione di dieci nuove marginelle (Gastropoda: Prosobranchia, Marginellidae e Cystiscidae) della provincia Indo-Pacifica". Malacologia Mostra Mondiale. 35: 3–11.