Panisaspis sp. 1

Neo, Usa & Adrain, Jonathan M., 2011, 2969, Zootaxa 2969, pp. 1-68 : 23

Panisaspis sp. 1

Fig. 36.1, 36.2, 36.5, 36.8

Material. Assigned specimen SUI 125835 , from Section H 127.1 m, Fillmore Formation (Tulean; Heckethornia bowiei Zone ), southern Confusion Range , Ibex area, Millard County, western Utah, USA .

Discussion. A single cranidium from Section H 127.1 m provides evidence of a new species of Panisaspis which must remain in open nomenclature due to lack of other material. It differs from the co-occuring species Panisaspis deltaensis most notably in its extremely dense granulose sculpture. Panisaspis sp. 1 also possesses a more elongate glabella with a longer frontal lobe and relatively larger L1; a wider and longer LO; a narrower genal angle; and a shorter, narrower genal spine. It resembles the cranidia of the younger species P. rancherensis , with very similar sculpture, but its glabella is narrower and more elongate, with a larger L1; LO is wider and laterally tapered; the palpebral lobes are longer, with a narrower interocular fixigena; and the posterior fixigenae are much wider. The cranidial sculpture is also similar to that of P. loganensis , but the glabella of Panisaspis sp. 1 is anteriorly rounded instead of tapered, with a much longer and wider frontal lobe and a smaller L1 and LO is longer, with wider and more strongly laterally tapered sections. This species most closely resembles Panisaspis sp. 3 , as discussed below.