Aulacognathus kuehni Mostler, 1967

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 : 23

Aulacognathus kuehni Mostler, 1967

Figure 9.15 -16

*1967 Aulacognathus kuehni ; Mostler, pl. 1 figs. 21, 24-25 (Pa element)

1972 Aulacognathus kuehni Mostler ; Aldridge, pl. 2 fig. 6.

1974 Aulacognathus kuehni Mostler ; Klapper and Murphy, pl. 1, figs. 2-3.

1975 Aulacognathus kuehni Mostler ; Aldridge, pl. 3, fig 13.

1983 Aulacognathus kuehni Mostler ; Nowlan, fig. 4I.

1986 Aulacognathus kuehni Mostler ; Bischoff, pl. 5, figs. 10-16 (Pa and Pb elements).

1987 Aulacognathus kuehni Mostler ; Over and Chatterton, pl. 3 fig. 20.

2007a Aulacognathus kuehni Mostler ; Männik, fig. 6B.

2008 Aulacognathus kuehni Mostler ; Männik, fig. 8J.

2014 Aulacognathus kuehni Mostler ; Sullivan, Kleffner, and Brett, fig. 7.1.

Description. P 1 element broad, stellate, with a straight primary carina that continues as a blade at the anterior end of the element. A nodose outer lateral process extends from the point where the main carina is replaced by the blade. A secondary,

bowed carina runs roughly parallel to the main carina. The primary and secondary carinas are separated by a deep groove. Secondary carina is replaced by a low blade in the anterior portion of the element. A nodose and wide inner lateral process extends from the middle of the secondary carina. Secondary carina less bowed, and lateral processes less developed on juvenile specimen.

Material examined. Three P 1, one P 1 fragment.

Figures

FIGURE 9. Conodonts from the Garrison Core and DX5 outcrop. 1-8, Wurmiella? polinclinata polinclinata, S0 element, anterior view, GC 130.79–131.09 m, SUI 142286 (1); S1/2 element, posterior view, GC 115.51–115.79 m, SUI 142287 (2); S3/4 element, lateral view, GC 115.51–115.76 m, SUI 142288 (3); M element, lateral view, GC 130.20– 130.48 m, SUI 142289 (4); P2 element, lateral view, GC 130.20–130.48 m, SUI 142290 (5); P2 element, GC 130.79– 131.09 m, SUI 142291 (6); P1 element, lateral view, DX5 4.59–4.61 m, SUI 142292 (7); and P1 element, lateral view, DX5 3.49–3.59 m, SUI 142293 (8). 9-10, Aulacognathus angulatus, P1 element, oral view, GC 135.65–136.10 m, SUI 142294 (9) and S1/2? element, posterior view, GC 135.65–136.10 m, SUI 142295 (10). 11-14, Aulacognathus bullatus, P2 element, lateral view, DX5 1.34–1.54 m, SUI 142296 (11); P1 element, oral view, DX5 4.59–4.61 m, SUI 142297 (12); P1 element, oral view, DX5 0.67–0.74 m, SUI 142298 (13); and P1 element, oral view, GC 120.88– 121.13 m, SUI 142299 (14). 15-16, Aulacognathus kuehni, P1 element, oral view, GC 131.95–132.23 m, SUI 142300 (15) and juvenile P1 element, oral view, GC 131.95–132.23 m, SUI 142301 (16). 17, Astrolecignathus cf. milleri, Pa element, oral view, GC 121.92–121.88 m, SUI 142302. 18, Apsidognathus tuberculatus, Pa element, oral view, DX5 1.34–1.54 m, SUI 142303.