754


Journal of Paleontology 92(5):751–767 Type species.—Lingula davisii M’Coy, 1851.


Diagnosis.—Sutton et al. (2000) redescribed the type species, and we follow their concept of the genus.


Lingulella? sp. Figure 3.1–3.5


Occurrence.—In sample LR-1465.5, 5.5 ft (1.7 m) above the base of the Tanyard Formation, in the Cordylodus angulatus conodont Zone.


Description.—Ventral valve suboval, laterally elongated with sharply acuminate posterior margin. Larval shell round in out- line, prominent, ~250 μm in width. Pseudointerarea with wide, shallow, subtriangular pedicle groove. Anterior margin of pedicle groove strongly concave in outline (Fig. 3.2, 3.5). Flexure lines faint (Fig. 3.3). Dorsal valve not known.


Materials.—Five ventral valves, all fragmental (Supplemental Data Table 2), including illustrated ventral valves NPL 45434 and NPL 45435.


Remarks.—The material is tentatively assigned to the genus Lingulella because internal pitting, a character of the type species, is not seen, although the collection is of poorly preserved juveniles and small fragments of larger valves on which the pitting is unlikely to be preserved.


Stittia Freeman and Miller, 2011b Type species.—Stittia ornata Freeman and Miller, 2011b.


Diagnosis.—As in Freeman and Miller (2011b). Stittia ornata Freeman and Miller, 2011b Figure 3.6–3.8


2011a Genus and species indeterminate, Freeman and Miller, p. 698, figs. 1, 2.


2011b Stittia ornata Freeman and Miller, p. 45, fig. 4F–4P.


Holotype.—Ventral valve (USNM 542983) from the upper Cambrian Hellnmaria Member of the Notch Peak Formation, western Utah (Freeman and Miller, 2011b, fig. 4M, 4N).


Diagnosis.—As in Freeman and Miller (2011b).


Occurrence.—In the Saukia trilobite Zone and the Proconodontus tenuiserratus and Proconodontus posterocostatus conodont zones, in the Point Peak Member and San Saba Member of theWilberns Formation. In the same conodont zones in the Hellnmaria Member of the Notch Peak Formation, Utah (Freeman and Miller, 2011b). Possiblyinthe Eoconodontus notchpeakensis and lowest Cambrooistodus minutus conodont Subzones and the Prosaukia serotina Subzone of the Saukia trilobite Zone in the San Saba Member of the Wilberns Formation.


Description.—Larval shells 700–800 μmwide, as reconstructed from a fragment (Fig. 3.6). Larval shell with faint radial


Materials.—One dorsal valve fragment (NPL 45442) and 10 fragments unidentifiable to valve (Supplemental Data Table 1), including illustrated specimen NPL 45443.


Remarks.—The species is identified from comminuted shell fragments, some preserving parts of the smooth larval shell and characteristic postlarval ornament of transverse ridges spaced ~200 μm apart (Fig. 3.15), as well as from one dorsal valve fragment with the characteristic elongated dorsal median groove (Fig. 3.13).


Family Zhanatellidae Koneva, 1986 Genus Wahwahlingula Popov, Holmer, and Miller, 2002


ornamentation and strong growth lines. Postlarval ornamenta- tion of transverse terrace-like ridges, asymmetrical in lateral profile (Fig. 3.6, 3.7). Ridges cross growth lines and may trun- cate against the posterior lateral margins of larval shell. Ridges spaced 50–60 μm apart.


Materials.—Four dorsal valves and one ventral valve, all fragmental, and numerous small fragments (Supplemental Data Table 1), including illustrated dorsal valves fragments NPL 45436, and ventral valve fragment 45438.


Remarks.—Despite the fragmental nature of this material, diagnostic characteristics can be seen in the smooth larval shell and transverse postlarval ornament. Transverse grooves in the dorsal pseudointerarea are another diagnostic characteristic of the genus. This feature is present on fragments not identified to species due to lack of preserved ornament. The material differs slightly from Utah material assigned to Stittia ornata (Freeman and Miller, 2011b) in the spacing of the transverse ornament. On these specimens, it is spaced at 50–60 μm apart on neanic (juvenile) growth, but it is spaced 40–55 μm on Utah material. Well-preserved specimens of the species are rare in both loca- tions, and differences in ornament may be variable among individuals. The spacing of the transverse ornament distin- guishes the species from Stittia cf. S. notchensis (Walcott, 1908), on which transverse ridges are spaced 100–200 μm apart on neanic growth.


Stittia cf.S. notchensis (Walcott, 1908) Figure 3.10–3.14


1908 Obolus (Westonia) notchensis Walcott, p. 69, fig. 13.


1912 Obolus (Westonia) notchensis Walcott; Walcott, p. 463, pl. 63, fig. 9.


2011b Stittia cf. notchensis (Walcott); Freeman and Miller, p. 46, fig. 4A–4E.


Holotype.—Ventral valve (USNM 51731a) from the Notch Peak Formation, western Utah (Walcott, 1908, pl. 7, fig. 13).


Occurrence.—In the Eoconodontus notchpeakensis and Cambrooistodus minutus conodont zones and the Prosaukia serotina Subzone of the Saukia trilobite Zone, in the San Saba Member of the Wilberns Formation.


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