Freeman et al.—Upper Cambrian linguliform Brachiopods from Texas Type species.—Lingula antiquissima Jeremejew, 1856.


Diagnosis.—As in Popov et al. (2002). Wahwahlingula sp. Figure 3.15–3.18


Diagnosis.—Wahwahlingula with larval ornament of circular to subcircular, 2–4μm diameter flat-bottomed pits. Pits may overlap each other (Fig. 3.18). Postlarval ornament of circular to sub- circular, 3–5μmdiameter round-bottomed pits, evenly spaced and arranged in indistinct and randomly oriented lines (Fig. 3.17).


Occurrence.—In the lowest strata of the Saukia trilobite Zone, and in the Proconodontus tenuiserratus, Proconodontus pos- terocostatus conodont zones, and lowest strata of the Procono- dontus muelleri conodont Zone, in the Morgan Creek Limestone Member, Point Peak Member, and San Saba Member of the Wilberns Formation.


Description.—Low pedicle groove with subparallel margins (Fig. 3.16). Propareas low with faint flexure lines (Fig. 3.16).


Materials.—Five ventral valve fragments, including illustrated ventral valve fragment NPL 85570.


Remarks.—These specimens represent fragments of the thick- ened ventral propareas of what were clearly much larger speci- mens. The species differs from the type species in the pattern of pitting on postlarval growth. The species differs from Wahwahlingula sp. 1 reported from a similar stratigraphic interval in Utah (Freeman and Miller, 2011b) in having evenly spaced, mostly uniform round-bottomed pits in the postlarval growth. It differs from Wahwahlingula sp. 2, also from a similar stratigraphic position in Utah (Freeman and Miller, 2011b) in having subcircular rather than oval round-bottomed pits. It differs from the stratigraphically higher Utah Wahwahlingula sevierensis Holmer et al., 2005 in the slightly larger size of both the larval and postlarval pits. It differs from Wahwahlingula? emanuelensis Brock and Holmer, 2004, and Wahwahlingula kharbashi Ghobadi Pour, Kebriaee-Zadeh, and Popov, 2011, in having pitted ornament on its larval shell.


Genus Zhanatella Koneva, 1986 Type species.—Zhanatella rotunda Koneva, 1986.


Zhanatella utahensis Popov, Holmer, and Miller, 2002 Figure 3.19–3.26


2002 Zhanatella utahensis Popov, Holmer, and Miller, p. 221, fig. 5.1–5.19.


2011b Zhanatella utahensis Popov et al.; Freeman and Miller, p. 53, fig. 7I–7V.


Holotype.—Ventral valve (USNM 516778) from the Red Tops Member of the Notch Peak Formation, western Utah (Popov et al., 2002, fig. 5.16–5.18).


Diagnosis.—As in Popov et al. (2002).


755


Occurrence.—In the Proconodontus tenuiserratus and Proconodontus posterocostatus conodont zones and the Saukia trilobite Zone, in the Point Peak Member and San Saba Member of the Wilberns Formation. In the same conodont zones, in the Hellnmaria Member of the Notch Peak Formation in western Utah (Freeman and Miller, 2011b), and in the Cambrooistodus minutus conodont Subzone, in the Red Tops Member of the Notch Peak Formation in western Utah (Popov et al., 2002).


Materials.—Seven dorsal valves and one ventral valve (Supplemental Data Table 1), including illustrated dorsal valves NPL 85571and NPL 85572 and ventral valve NPL 45448.


Remarks.—The material is fragmental, but matches material described and illustrated previously. Freeman and Miller (2011b) illustrated but did not discuss differences between ornamentation on the larval shell versus postlarval ornamenta-


tion. Pits on the larval shell are more nearly round, are flat-bottomed (Fig. 3.25, 3.26), and vary in size from 1–3 μm near the beak of the larval shell (Fig. 3.25) to 4–6 μm closer to the margin of the larval shell (Fig. 3.26), whereas pits on postlarval growth are strongly oval in outline and round- bottomed, forming irregular, longitudinal rows (Fig. 3.22, 3.23). The pits on the larval shell are more randomly arranged, and may overlap each other (Fig. 3.25, 3.26).


Order Acrotretida Kuhn, 1949


Superfamily Acrotretoidea Schuchert, 1893 Family Acrotretidae Schuchert, 1893 Genus Eurytreta Rowell, 1966


Type species.—Acrotreta curvata Walcott, 1902.


Diagnosis.—As in Streng et al. (2011). Eurytreta sublata? Popov in Koneva and Popov, 1988 Figure 4.1–4.7


1967 Conotreta sp. Winston and Nicholls, p. 92, pl. 12, figs. 21, 24, 27.


1988 Eurytreta sublata Popov in Koneva and Popov, p. 60, pl. 2.4–2.8, pl. 3.11, fig. 3.


2001 Eurytreta sublata Popov; Holmer et al., p. 90, pl. 24.9–24.17, pl. 25.1, 25.2, 25.4.


2002 Eurytreta sublata Popov; Popov et al., p. 223, fig. 8.10–8.28.


Holotype.—Dorsal valve (CNIGR 13/12034) from the upper Cambrian Batrybay Section, Malyi Karatau, Kazakhstan (Koneva and Popov, 1988, pl. 2.4).


Diagnosis.—As in Popov et al. (2002).


Occurrence.—At the base of the Cordylodus intermedius conodont Zone, and in the Clavohamulus elongatus Subzone of the Cordylodus proavus conodont Zone, in the Symphysurina trilobite Zone, in the San Saba Member of the Wilberns Formation. Species occurs in the Cordylodus proavus and Cordylodus intermedius conodont zones and the Apoplanias


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