Tuleaspis, 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 : 36

Tuleaspis ? n. sp. B

Plate 54, figs 21–24.

1973 Protoliomerops quattuor Hintze ; Demeter, p. 53, pl. 3, fig. 1 [only; pl. 3, fig. 6 = Panisaspis quattuor (Hintze) ]. 2009 Ibexaspis sp. nov. A; Adrain et al., p. 563, fig. 13Z.

2011b Ibexaspis n. sp.; McAdams and Adrain, p. 44.

Material. Assigned specimen SUI 115251, from Section G 210.2 m, Fillmore Formation (Tulean; low Protopliomerella contracta Zone ), southern Confusion Range, Ibex area, Millard County, western Utah, USA.

Discussion. Tuleaspis ? n. sp. B is represented by a single cranidium that differs from the co-occurring species T. jeneki (cf. Pl. 44, fig. 24 with Pl. 54, fig. 22) in possessing more densely spaced tuberculate sculpture; a wider, slightly more inflated anterior border; shorter, narrower, more strongly vaulted (sag., especially tr.) glabella with smaller, narrower lateral lobes (particularly L1) and shallower furrows; a tuberculate LO without an obvious median node; shorter, wider palpebral lobes; wider interocular fixigenae (especially anteriorly), longer posterior fixigenae with a wider inner portion and narrower outer portion; and a tuberculate (rather than mostly effaced) posterior border with small genal spines.

Compared to that of Tuleaspis n. sp. A, the cranidium of Tuleaspis ? n. sp. B is broader relative to its length, and less strongly vaulted (sag., tr.); with a less strongly anteriorly bowed anterior border; narrower, more strongly inflated glabella with shorter and shallower lateral furrows; shorter SO; densely tuberculate LO; larger (wider and longer) palpebral lobes; and posterior border lacking obvious isolated tubercles along posterior portion. Some of these differences, e.g., furrow length and LO sculpture, may be due to the larger size of the Tuleaspis n. sp. A cranidium, but this cannot be determined without more specimens of both species.