Partial apparatus reconstruction for Ellisonia cf. triassica, from Koike et al. (2004).

Belongs within: Prioniodinidae.

The Ellisoniidae are a lineage of conodonts known from the Late Carboniferous to the Triassic (Sweet 1988).

Characters (from Sweet 1988): Skeletal apparatus sexi- or septimembrate, with morphologically conservative alate, digyrate, and bipennate ramiform elements in S and M positions, an extensiform digyrate element in Pa position, and another digyrate element in Pb position with processes reflected sharply downward and anteriorly.

    |--Stepanovites Kozur 1975AS93
    |--Furnishius Clark 1959S88
    |    `--*F. triserratus Clark 1959H62
    |--Sweetina Wardlaw & Collinson 1986S88
    |    |--S. festivaS88
    |    `--S. triticumS88
    |--+--Pachycladina Staesche 1964S88
    |  `--Hadrodontina Staesche 1964S88
    |       `--H. aequabilis Staesche 1964FP12
    |--Gladigondolella Müller 1962S88
    |    |--*G. tethydis (Huckriede 1958) [=Polygnathus tethydis]S88
    |    |--G. carinataS88
    |    `--G. meekiS88
    `--Ellisonia Müller 1956S88
         |--*E. triassicaS88
         |--E. conflexaS88
         |--E. excavataPD98
         |--E. gradataRR79
         |--E. latilaminata von Bitter & Merrill 1983AS93
         `--E. tribulosaRR79

*Type species of generic name indicated


[AS93] Aldridge, R. J., & M. P. Smith. 1993. Conodonta. In: Benton, M. J. (ed.) The Fossil Record 2 pp. 563–572. Chapman & Hall: London.

[FP12] Farabegoli, E., & M. C. Perri. 2012. Millennial physical events and the end-Permian mass mortality in the western Palaeotethys: timing and primary causes. In: Talent, J. A. (ed.) Earth and Life: Global biodiversity, extinction intervals and biogeographic perturbations through time pp. 719–758. Springer.

[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.

[PD98] Purnell, M. A., & P. C. J. Donoghue. 1998. Skeletal architecture, homologies and taphonomy of ozarkodinid conodonts. Palaeontology 41: 57–102.

[RR79] Ross, C. A., & J. R. P. Ross. 1979. Permian. In: Robison, R. A., & C. Teichert (eds) Treatise on Invertebrate Paleontology pt A. Introduction. Fossilisation (Taphonomy), Biogeography and Biostratigraphy pp. A291–A350. 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.

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