Gnathodus

Platform element of Gnathodus delicatus, copyright University of Iowa Paleontology Repository.

Belongs within: Spathognathodontidae.

Gnathodus is a genus of conodonts known from the Lower Carboniferous (Sweet 1988).

Characters (from Sweet 1988): Pa elements conspicuously asymmetric; anterior end of cup on concave ("inner") side of element invariably joining blade well anterior to anterior end of cup on convex ("outer") side; nodes on upper surface of inner cup segment commonly joining to form distinctive ridge- or comblike parapet; outer cup commonly more broadly expanded than inner one.

Gnathodus Pander 1856 H62 [incl. Dryphenotus Cooper 1939 H62, Westfalicus Schmidt in Moore & Sylvester-Bradley 1957 M62]
    |--G. cuneiformis S88
    `--+--G. delicatus S88
       `--+--G. typicus Cooper 1939 S88, WM03
          `--+--G. punctatus S88
             `--+--G. semiglaber S88
                `--+--G. pseudosemiglaber S88
                   `--G. texanus S88

Gnathodus incertae sedis:
  *G. bilineatus S88
  G. austini Belka 1985 S88
  G. girtyi R79
    |--G. g. girtyi R79
    `--G. g. simplex R79
  G. integer Schmidt 1934 [=*Westfalicus integer] M62
  G. mosquensis Pander 1856 M62
  G. praebilineatus Belka 1985 S88
  G. pustulosus H62
  G. scotiaensis S88
  G. simplicatus S88
  G. subblineatus S88
  G. symmutatus S88

*Type species of generic name indicated

REFERENCES

[H62] Hass, W. H. 1962. Conodonts. In: Moore, R. C. (ed.) Treatise on Invertebrate Paleontology pt W. Miscellanea: Conodonts, Conoidal Shells of Uncertain Affinities, Worms, Trace Fossils and Problematica pp. W3–W69. Geological Society of America, and University of Kansas Press.

[M62] Müller, K. J. 1962. Supplement to systematics of conodonts. In: Moore, R. C. (ed.) Treatise on Invertebrate Paleontology pt W. Miscellanea: Conodonts, Conoidal Shells of Uncertain Affinities, Worms, Trace Fossils and Problematica pp. W246–W249. Geological Society of America, and University of Kansas Press.

[R79] Ross, C. A. 1979. Carboniferous. In: Robison, R. A., & C. Teichert (eds) Treatise on Invertebrate Paleontology pt A. Introduction. Fossilisation (Taphonomy), Biogeography and Biostratigraphy pp. A254–A290. The Geological Society of America, Inc.: Boulder (Colorado), and The University of Kansas: Lawrence (Kansas).

[S88] Sweet, W. C. 1988. The Conodonta: Morphology, taxonomy, paleoecology, and evolutionary history of a long extinct animal phylum. Clarendon Press: Oxford.

[WM03] Webster, G. D., C. G. Maples, R. Mawson & M. Dastanpour. 2003. A cladid-dominated Early Mississippian crinoid and conodont fauna from Kerman Province, Iran and revision of the glossocrinids and rhenocrinids. Journal of Paleontology 77 (Suppl. 3): 1–35.