Yet another member of the hyper-diverse gastropod family Mangeliidae, Pyrgocythara filosa Rehder, 1943 grows to about 7 mm (0.28 inch) in length, and has a sculpture of about 10–12 axial ribs that span the entire whorl, each rib abutting the ones in previous whorls. The ribs are crossed by finer spiral lines. The shell color in this species is very distinctive, with each half-whorl divided into an anterior brown part and posterior cream-colored one.
Shell of the Week: The False Mangelia
The False Mangelia, Pyrgocythara filosa, from Sanibel. Photos by Patricia A. Starkey.