Deltapliomera, E.B & Adrain & Karim, 2018

E. B, Neo, Adrain, Jonathan M. & Karim, Talia S., 2018, The pliomerid trilobite Ibexaspis and related new genera, with species from the Early Ordovician (Floian; Tulean, Blackhillsian) of the Great Basin, western USA, Zootaxa 4525 (1), pp. 1-152 : 32

Deltapliomera n. sp. A

Plate 21, figs 22–26

2009 Ibexaspis sp. nov. 5 (partim); Adrain et al., p. 569, fig. 16L (only; fig. 16P = Deltapliomera heimbergi n. sp.).

Material. Assigned specimen SUI 115308 from Section H 172.5T m, Fillmore Formation (Floian; Tulean; Panisaspis sevierensis Zone), southern Confusion Range, Ibex area, Millard County, western Utah, USA.

Discussion. A single cranidium differs from the co-occurring species D. heimbergi (cf. Pl. 21, fig. 22 with Pl. 23, fig. 1) by being broader, less strongly vaulted (tr., sag.) both axially and from less strongly downturned fixigenae; in possessing considerably finer, denser tuberculate sculpture; narrower interocular fixigenae; narrower palpebral lobes; a more parallel-sided, not forwardly-expanding, glabella that is broader at the base and has a larger, more transversely oriented L1, and a slightly smaller L3 and shallower S3; slightly shorter SO; longer, wider, more effaced LO; longer (especially adaxially) and a less tuberculate posterior border.

Deltapliomera heimbergi occurs separately from Deltapliomera n. sp. A at H 166.2 m and at H 173.2 m.