| The base of the Silesian is undefined, the top is defined by the first appearance of the conodont Streptognathodus isolatus. |
| The conodont element on the left side is obvious if you are looking for it. |
| Far less debatably, the long conodont body has obvious V-shaped myomeres throughout its length. |
| The observable properties of conodont apparatus carry a variety of features permitting assignment of these higher taxa into different branches of Metazoa. |
| At one time or another, most of these have been regarded as conodont elements. |
| Clarkina rosenkrantzi is the only gondolellid conodont of the Dzhulfian beds of Greenland and of the Zechstein Limestone in middle and NW Europe. |
