Zetela praetextilis

Zetela praetextilis is an extinct species of sea snail, a marine gastropod mollusk, in the family Solariellidae. This species occurs in New Zealand.

Description
The small, thin shell is  conoidal and  very  moderately  umbilicated. It shows oblique axial  riblets on  the  upper  whorls,  reduced  to  gemmules  upon  the  spiral  lirae  on  the  lower  whorls.

Sculpture: The protoconch  is spirally  striated,  the  succeeding  two  or  three  whorls  show  oblique, retractive,  fine  axial  riblets,  about  30  on  a  whorl,  which  are  present  on  the  lower whorls  only  below  the  suture,  but  farther  down  by  round  gemmules  upon  the  spiral threads,  which  number  6  on  the  penultimate  whorl. On the  body whorl  there  are  2 stronger  and  a  little  more  distant  spirals  at  the  periphery, rendering  it  faintly  bicarinate. On the  base  there  are  1  or  2 fine  spiral  threads  below  the  periphery,  the  space between  them  and  the  umbilicus  bearing  fine  radial  riblets. The umbilicus  is  margined by  a  strongly  gemmate  ridge,  followed  by  a  much  finer  one  inside  the  umbilicus. The spire conoidal,  a  little  lower  than  the  height  of  the  aperture. The protoconch is small,  convex, with  a  few  spirals. The shell contains 4½ convex whorls. The body whorl is faintly  bicarinate,  the  base  flatly convex. The suture is canaliculate. The aperture is hidden  by  the  matrix. The deep umbilicus is moderate, not  quite  one-third  of  the  greatest  diameter.