Paraliroceras Barskov & Shilovsky 2014

Genus Paraliroceras Barskov & Shilovsky in Barskov et al., 2014 Type species Paraliroceras kazanicum Barskov & Shilovsky in Barskov et al., 2014; original designation. Diagnosis Genus of the family Liroceratidae with pachyconic, subinvolute conch. The conch is rapidly increasing in height with a high coiling rate (WER = 2.30–2.90). Whorls moderately embracing, whorl profile reniform; umbilical margin pronounced, narrowly rounded. Adult ornament with fine growth lines with a fairly deep ventral sinus. Septa without inflexions, slightly concave. Suture line simple, nearly straight to straight with a shallow, broadly rounded internal lobe. The siphuncle has a position between the centre of the septum and the venter. Included species Western Russia (Barskov et al. 2014): Paraliroceras kazanicum Barskov & Shilovsky in Barskov et al., 2014, Roadian. Central Iran (this paper): Paraliroceras macrogaster sp. nov., Wuchiapingian. Remarks Paraliroceras is similar to Liroceras and differs mainly in the pronounced umbilical margin, which is narrowly rounded in Paraliroceras but usually broad and evenly rounded in Liroceras. The species of Paraliroceras are more widely umbilicate than most known species of Liroceras.