E. Rolân, R. Fernândez-Garcés, C. Redfern 
Novapex 13(2): 45-62, 10 juin 2012 
Figure 9. A-C. Glyphoturris rugirima (Dali, 1889). A-B. shell, 5.0, 4.8 mm, Rancho Luna, 10-30 m (MHNS); 
C. microsculpture. 
Dichotomous key for the species of Agathotoma in the présent work| 
1 -Protoconch with only 1-1.3 whorls. 
-Protoconch with at least 2 whorls. 5 
2 -Microsculpture of the protoconch with zigzag Unes. apocrypha 
-Microsculpture of the protoconch with tubercles. 3 
3 -Protoconch with cylindrical profile . kirshi 
-Protoconch with rounded dôme profile. 4 
4 -Protoconch with dense microsculpture of tubercles. ecthymata 
-Protoconch with microsculpture of tubercles in lines. eduardoi 
5 -Axial ribs with pronounced angulation a short distance below suture . 6 
-Upper part of axial ribs rounded near suture. 7 
6 - The angulation is < 90° on first whorl and around 90° on the following ones . prominens 
- the angulation is about 90° on first teleoconch whorl and > 90° on the following. asthenika 
7 - Axial ribs elevated subsuturally but not surpassing level of suture; the profile of the ribs is 
vertical . candidissima 
- Upper curvature of axial ribs frequently surpassing level of suture; the profile of the ribs is 
inclined . castellata 
59 
