﻿Spirifer 
  kayserianus 
  Clarke 
  

  

  Fig. 
  i 
  A 
  well-preserved 
  dorsal 
  valve, 
  with 
  the 
  characteristic 
  

   mature 
  sculpture 
  

   2 
  Sculpture 
  cast 
  of 
  the 
  ventral 
  valve 
  

   3, 
  4 
  Dorsal 
  valves 
  of 
  adult 
  shells 
  

   Locality: 
  Ponta 
  Grossa, 
  Brazil 
  

  

  1 
  86 
  

  

  

  