Abichites infirmis

Description Holotype MB. C. 30086 is a rather well-preserved specimen with 42 mm conch diameter (Fig. 60 A). The whorl profile of the body chamber is subtrapezoidal with a narrowly rounded umbilical margin, flat and weakly converging flanks, a subangular ventrolateral shoulder and a flattened but still broadly rounded venter. Its ww / wh ratio is 0.70 and the whorl embraces the preceding one only weakly. The shell appears to be smooth except for very faint plications. The suture line of the holotype has a parallel-sided external lobe that has a width / depth ratio of ~ 0.75. It is deeper than the adventive lobe and possesses unsubdivided lanceolate prongs. The ventrolateral saddle is inverted U-shaped and symmetric and the weakly asymmetric, parallel-sided adventive lobe is subdivided into two secondary notches. The narrow lateral saddle is also inverted U-shaped and followed by a parallel-sided lateral lobe with two notches (Fig. 60 B).