FIGURE 2 in Revision of the Early Ordovician (late Tremadocian; Stairsian) cheirurid trilobite Tesselacauda Ross, with species from the Great Basin, western USA

FIGURE 2. Hypostomes of various species of Pliomeridae. 1. Protopliomerella contracta Ross, 1951, SUI 126034, Section G 210.2 m (Floian; Tulean; Protopliomerella contracta Zone), x15. 2. Protopliomerella stegneri McAdams and Adrain, 2011c, SUI 126071, Section G 142.0–144.5T m (Floian; Tulean; unzoned strata beneath Psalikilopsis cuspidicauda Zone), x12. 3. Protopliomerella bowlesi McAdams and Adrain, 2011c, SUI 126108, Section G 162.0T m (Floian; Tulean; low Psalikilopsis cuspidicauda Zone), x15. 4. Protopliomerella okeefeae McAdams and Adrain, 2011c, SUI 126330, Section G 258.2 m (Floian; Tulean; Heckethornia hyndeae Zone), x20. 5. Protopliomerella kerouaci McAdams and Adrain, 2011c, SUI 126173, Section HC6 203.0 m (Floian; Tulean; Psalikilus typicum Zone), x15. 6. Protopliomerella seegeri McAdams and Adrain, 2011c, SUI 126258, Section G 181.8 m (Floian; Tulean; low Psalikilus hestoni Zone), x12. 7. Hintzeia parafirmimarginis McAdams and Adrain, 2011a, Section HC6 165.2 m (Floian; Tulean; Psalikilus spinosum Zone), x10. 8. Hintzeia firmimarginis (Hintze, 1953), SUI 125507, Section G 99.0T-A (Floian; Tulean; Psalikilus spinosum Zone), x7.5. 9. Hinteia celsaora (Ross, 1951), SUI 125588, Section G 118.6 m (Floian; Tulean; Hintzeia celsaora Zone), x12. 10. Panisaspis topscityensis McAdams and Adrain, 2011b, SUI 125736, Section G 210.2 m (Floian; Tulean; Protopliomerella contracta Zone), x10. 11. Panisaspis quattuor (Hintze, 1953), SUI 125785, Section G 174.0 m (Floian; Tulean; Psalikilus typicum Zone), x12. 12. Panisaspis sevierensis McAdams and Adrain, 2011b, SUI 125663, Section H 173.2 m (Floian; Blackhillsian; Psalikilus pikum Zone), x10. 13. Panisaspis millardensis McAdams and Adrain, 2011b, SUI 125628, Section H 187.4 m (Floian; Blackhillsian; Bathyurina plicolabeona Zone), x12. 14. Cybelopsis sp. nov. 1 of Adrain et al. (2009, p. 575, fig. 21B, F), SUI 147645, Section H 290.4 m (Floian; Blackhillsian; "Pseudocybele nasuta" Zone"), x6. 15. Cybelopsis depressa (Young, 1973), SUI 147646, Section H 185.6 m (Floian; Blackhillsian; Bathyurina plicolabeona Zone), x10. 16. Cybelopsis n. sp. 2, SUI 147647, Section H 264.0–267.0T m (Floian; Blackhillsian; Presbynileus ibexensis Zone), x15. 17. Cybelopsis n. sp. 3, SUI 147648, Section J 35.3 m (Floian; Blackhillsian; "Pseudocybele nasuta Zone"), x10.