Oulodus sp.

Waid, Christopher B. T. & Cramer, Bradley D., 2017, Telychian (Llandovery, Silurian) conodonts from the LaPorte City Formation of eastern Iowa, USA (East-Central Iowa Basin) and their implications for global Telychian conodont biostratigraphic correlation, Palaeontologia Electronica 42 (6), pp. 1-37 : 26

Oulodus sp. indet.

Figure 8.13, 8.15

Description. Sa element alate, with a large, posteriorly reclined cusp. One lateral process broken, other extends downward and away from cusp. Lateral process has three widely separated, peg-like denticles, with a U-shaped profile between them. Basal cavity wide and slightly expanded posteriorly. Pa? element digyrate, with slightly twisted lateral processes. Cusp reclines anteriorly over expanded basal cavity.

Remarks. Numerous specimens were recovered that exhibit the widely spaced, peg-like denticles, and expanded basal cavities that are diagnostic features of Oulodus , but were either not elements useful for species diagnosis or too poorly preserved to assign to a species.

Material examined. Four Sa, five Sc, one Pb, one Pa.

Figures

FIGURE 8. Conodonts from the Garrison Core. 1-12, 19, Psuedolonchodina sp. n., Sa element, posterior view, GC 115.51–115.76 m, SUI 152266 (1); Sa element, posterior-aboral view, GC 121.62–121.88 m, SUI 142267 (2); Sb element, anterior view, GC 134.06–134.31 m, SUI 142268 (3); Sc element, lateral view, GC 130.20–130.48, SUI 142269 (4); Sc/M? element fragment, lateral view, GC 128.85–129.11 m, SUI 142270 (5); M element, lateral-posterior view, GC 131.95–132.23 m, SUI 142271 (6); M element, anterior-lateral view, GC 134.06–134.31 m, SUI 142272 (7); Pa element, oral view, GC 134.06–134.31 m, SUI 142273 (8); Pa element, oral view, GC 130.79–131.09m, SUI 142274 (9); Sc element, lateral view, GC 135.65–136.10 m, SUI 142259 (10); Pb element, lateral, and lateral-aboral views, GC 115.51–115.76 m, SUI 142275 (11 and 12); and Pb element, lateral view, GC 130.79-131.09 m, SUI 142276 (19). 13, 15, Oulodus sp. indet., Sa element, anterior-lateral view, GC 137.12–137.40 m, SUI 142277 (13) and Pa element, posterior view, GC 135.65–136.10 m, SUI 142278 (15). 14, 16-17, Oulodus cf. Ou. petilus pacificus, Sc element, lateral view, GC 134.06–134.31 m, SUI 142279 (14); Sb element, posterior-oral view, GC 130.20–130.48 m, SUI 142280 (16); and Pb element, anterior-lateral view, GC 130.79–131.09 m, SUI 142281 (17). 18, 21-22, Distomodus staurognathoides, Sb element, posterior view, GC 134.06–134.31 m, SUI 142282 (18); Pa element, oral view, GC 135.65– 136.10 m, SUI 142283 (21); and Pa element, oral view, GC 135.65–136.10 m, SUI 142282 (22). 20, Aulacognathus angulatus, P2 element, lateral view, GC 135.65–136.10 m, SUI 142285.