Cerion (Paracerion) costellata Pilsbry, 1946

Original Description

"Cerion tridentatum Pilsbry & Vanatta.  Fig. 80.  Specimens from Rincon de Guanabon, Cuba, were planted on Garden Key [Dry Tortugas]  in 1924. They remain abundant and are variable, passing by continuous variation from the smooth typical form, which is rare on Garden Key, to the finely ribbed forma costellata, illustrated in Fig. 80, b, c, d.  Teeth are typically as in fig. 78e, but they vary somewhat individually.  This species is type of the subgenus Paracerion P. & V., 1985." (Pilsbry, 1946:168) 
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