Oncodella

Oncodella
Temporal range: Norian–Rhaetian
Diagram of Oncodella paucidentata
Scientific classification
Kingdom:
Animalia
Phylum:
Chordata
Class:
†Conodonta
Order:
†Prioniodontida
Family:
†Coleodontidae
Genus:
†Oncodella

Mosher 1968

Oncodella is an extinct genus of Late Triassic (latest Norian to early Rhaetian) conodont.[1][2] The genus was given the type species Oncodella idiodentica by Mosher (1968), on the basis of fossils from the Late Triassic of Austria.[3] However, Mosher (1969) later revised the species name to Oncodella paucidentata, since identical fossils from the same area were previously given the name Hindeodella paucidentata by Mostler (1967).[4][5]

Like many genera which occupied the last phases of conodont evolution, Oncodella was atavistic and relatively simple in form, possibly due to environmental stresses.[6] The origin of the genus is poorly understood. The common type species, Oncodella paucidentata, had a rod-like lower bar hosting a row of three to five denticles (tooth-like spines). The denticles were elongated, thin, and widely-spaced. They tilted backwards, especially towards the back of the platform.[3] An extremely rare second species, Oncodella mostleri, is only known from Hungary. It had three to four smaller denticles between the first and second large denticles, as well as a short rear bar without denticles.[7]

  1. ^ Kozur, Heinz; Mock, Rudolf (October 1991). "New Middle Carnian and Rhaetian Conodonts from Hungary and the Alps. Stratigraphic Importance and Tectonic Implications for the Buda Mountains and Adjacent Areas" (PDF). Jahrbuch der Geologischen Bundesanstalt-A. 134 (2): 271–297.
  2. ^ Cite error: The named reference :1 was invoked but never defined (see the help page).
  3. ^ a b Mosher, L. Cameron (July 1968). "Triassic Conodonts from Western North America and Europe and Their Correlation". Journal of Paleontology. 42 (4): 895–946. JSTOR 1302396.
  4. ^ Mostler, Von H. (1967). "Conodonten und Holothuriensklerite aus den norischen Hallstätter-Kalken von Hernstein (Niederösterreich)" (PDF). Verhandlugen der Geologische Bundesanstalt. 1–2: 177–188.
  5. ^ Mosher, L. Cameron (November 1969). "Nomenclatural Revisions for Triassic Conodonts in Mosher, 1968". Journal of Paleontology. 43 (6): 1441. JSTOR 1302527.
  6. ^ Kılıç, Ali M.; Plasencia, Pablo; Guex, Jean; Hirsch, Francis (2017), Montenari, Michael (ed.), "Challenging Darwin: Evolution of Triassic Conodonts and Their Struggle for Life in a Changing World", Stratigraphy & Timescales, Advances in Sequence Stratigraphy, vol. 2, Academic Press, pp. 333–389, doi:10.1016/bs.sats.2017.08.003, ISBN 9780128130773
  7. ^ Cite error: The named reference :2 was invoked but never defined (see the help page).