Proconodontida

Cordylodus intermedius, from Fossiilid.info.

Belongs within: Conodonta.

The Proconodontida are a lineage of conodonts characterised by thin-walled, smooth-surfaced elements that form a relatively simple apparatus. The earliest representative of the proconodontidans is the Late Cambrian Proconodontus, which possessed an apparently unimembrate apparatus of relatively large, deeply excavated, smooth-surfaced, hyaline coniform elements (Sweet 1988).

<==Proconodontida [Cavidonti] SD01
    |--Proconodontidae SD01
    |    |--Eoconodontus Miller 1980 S88
    |    |    `--E. notchpeakensis LM05
    |    `--Proconodontus Miller 1969 S88
    |         |--P. notchpeakensis DJ71
    |         `--P. serratus LM05
    `--+--+--Fryxellodontus Miller 1969 S88 [Fryxellodontidae SD01]
       |  |    |--F. inornatus DJ71
       |  |    `--F. lineatus LM05
       |  `--Pygodontidae SD01
       |       |--Nericodus Lindström 1955 S88
       |       |    `--*N. capillamentum Lindström 1954 H62
       |       `--+--Polonodus Dzik 1976 S88
       |          |    `--P. corbatoi PBJ03
       |          `--Pygodus Lamont & Lindström 1957 S88, M62
       |               |--*P. anserinus Lamont & Lindström 1957 M62
       |               |--P. lyra S88
       |               `--P. serra S88
       `--+--+--Ansellidae SD01
          |  |    |--Ansella Fåhraeus & Hunter 1985 S88
          |  |    |    `--A. longicuspica PBJ03
          |  |    `--Hamarodus Viira 1975 S88
          |  |         `--H. europaeus S88
          |  `--Dapsilodontidae SD01
          |       |--Besselodus Aldridge 1982 S88
          |       `--Dapsilodus Cooper 1976 S88
          |            |--D. mutatus PBJ03
          |            `--D. obliquicostatus (Branson & Mehl 1933) WBN02
          `--Cordylodontidae SD01
               |--Cambrooistodus Miller 1980 S88
               |    |--C. cambricus LM05
               |    `--C. minutus LM05
               `--+--Iapetognathus Landing 1982 S88
                  |    `--I. aengensis S88
                  `--Cordylodus Pander 1856 S88
                       |  i. s.: C. andresi LM05
                       |         C. hastatus LM05
                       |--C. lindstromi Druce & Jones 1971 DJ71
                       |--C. oklahomensis Müller 1959 DJ71
                       |--C. prion Lindström 1954 DJ71
                       `--+--C. proavus Müller 1959 DJ71
                          `--+--*C. angulatus Pander 1856 DJ71
                             |--C. caseyi Druce & Jones 1971 DJ71
                             |--C. intermedius Furnish 1938 DJ71
                             `--C. rotundatus Pander 1856 [incl. C. subangulatus Furnish 1938] DJ71

*Type species of generic name indicated

REFERENCES

[DJ71] Druce, E. C., & P. J. Jones. 1971. Cambro-Ordovician conodonts from the Burke River Structural Belt, Queensland. Commonwealth of Australia, Bureau of National Development, Bureau of Mineral Resources, Geology and Geophysics, Bulletin 110: 1–159.

[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.

[LM05] Lehnert, O., J. F. Miller, S. A. Leslie, J. E. Repetski & R. L. Ethington. 2005. Cambro-Ordovician sea-level fluctuations and sequence boundaries: the missing record and the evolution of new taxa. Special Papers in Palaeontology 73: 117–134.

[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.

[PBJ03] Pyle, L. J., C. R. Barnes & Z. Ji. 2003. Conodont fauna and biostratigraphy of the Outram, Skoki, and Owen Creek Formations (Lower to Middle Ordovician), Wilcox Pass, Alberta, Canada. Journal of Paleontology 77 (5): 958–976.

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

[SD01] Sweet, W. C., & P. C. J. Donoghue. 2001. Conodonts: past, present, future. Journal of Paleontology 75 (6): 1174–1184.

[WBN02] Won, M.-Z., R. B. Blodgett & V. Nestor. 2002. Llandoverian (Early Silurian) radiolarians from the Road River Formation of east-central Alaska and the new family Haplotaeniatumidae. Journal of Paleontology 76 (6): 941–964.