Distomodus staurognathoides ( Walliser, 1964 )

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 : 21-22

Distomodus staurognathoides ( Walliser, 1964)

Figure 8.18, 8.21 -22

*1964 Hadrognathus staurognathoides Walliser , pl. 5 fig. 2; pl. 13, figs. 6-15 (Pa elements).

2002 Distomodus staurognathoides Walliser ; Zhang and Barnes, fig. 14.1-14.17 (multielement, synonymy through 1999).

2003 Distomodus staurognathoides Walliser ; Pyle and Barnes, fig. 16.16.

2006 Distomodus staurognathoides Walliser ; Hints, Killing, Männik, and Nestor, pl. 3, fig. 15.

2007 Distomodus staurognathoides Walliser ; Loydell, Kleffner, Mullins, Butcher, Matteson, and Ebert, fig. 6bb.

2007a Distomodus staurognathoides Walliser ; Zhang and Barnes, fig. 9.26.

2013 Distomodus staurognathoides Walliser ; Männik, Miller, and Hairapetian, fig. 4e.

2014 Distomodus staurognathoides Walliser ; Sullivan, Kleffner, and Brett, figs. 7.13-7.14, 8.4.

2015 Distomodus staurognathoides Walliser ; Loydell, Frỳda, and Gutiérrez-Marco, fig. 8b.

Description. Pa element stellate and broad, with five processes of varying width and curvature originating from the middle of the element. All processes nodose. Nodes are aligned in fairly even rows on small specimens. On large specimens, some nodes are aligned, and others are scattered over each process. Sb elements are tertiopedate. Lateral processes denticulate, and extend laterally and slightly posteriorly from the cusp at differing angles. Posterior process short with two denticles.

Material examined. Eight Sb, elevenPa elements.

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.