Felipponea elongata was originally discovered and described (under the name Ampullaria (Felipponea) elongata) by W. H. Dall in 1921.[1]
Dall's original text (the type description) reads as follows:
AMPULLARIA (FELIPPONEA) ELONGATA n. sp.
Shell solid, conic, of three and a half flattish whorls separated by a distinct, almost channelled suture (the apex deeply
eroded); shell substance grayish to slate color, with irregular
broad spiral purple lines, the whole covered with an olivaceous,
thick, polished, dehiscent periostracum of a brittle character;
base rounded, umbilicus only a narrow chink behind the thin
raised inner lip; aperture pear-shaped, smooth inside, showing
the color bands; margin sharp-edged, not continuous across the
body. Height of decollate shell 29; of last whorl 25; of aperture 17; of maximum diameter 19 mm. U. S. Nat. Mus. No.
333024.
Habitat. Uruguay River, Dept. of Paysandú; Dr. F. Felippone.
It is interesting to get another and quite distinct species of
this subgenus which seems characteristic of Uruguay River
fauna. The present species differs most obviously from the
type, F. neritiniformis, in the flat-sided spire and absence of an
umbilicus.
