Ticinepomis Explained

thumb|left|Marine life of the Early and early Middle Triassic: Ticinepomis (13)[1] Ticinepomis is an extinct genus of coelacanth lobe-finned fish which lived during the Middle Triassic period in what is now Switzerland. It contains two species, T. peyeri and T. ducanensis.[2]

Specimens of the species T. peyeri, which was named after Bernhard Peyer, are most common in the Besano Formation (or Grenzbitumenzone) of Monte San Giorgio in canton Ticino. Other coelacanths from Monte San Giorgio include a larger species (tentatively referred to Holophagus picenus) from the Besano Formation,[3] and a species of Heptanema from the Meride Limestone.[4]

Larger Ticinepomis specimens have been found in the Prosanto Formation of canton Graubünden, originally referred to as Ticinepomis cf. T. peyeri. A revision showed that this material belongs to a new species, T. ducanensis, remains of which were also discovered in the Besano Formation of canton Ticino.[2] The Prosanto Formation also produced the unusual coelacanths Foreyia and Rieppelia.

Classification

Ticinepomis was originally described as being a member of the family Coelacanthidae, being similar to Coelacanthus, Holophagus and Undina.[5] Later, T. peyeri was placed in Latimeriidae.[6] The bizarre Prosanto Formation latimeriid Foreyia is thought to be T. peyeris closest relative, as they share many features despite their drastically contrasting appearances.[7]

Notes and References

  1. Scheyer . Torsten M. . Romano . Carlo . Jenks . Jim . Bucher . Hugo . 2014 . Early Triassic Marine Biotic Recovery: The Predators' Perspective . PLOS ONE . 9 . 3 . e88987 . 10.1371/journal.pone.0088987 . 24647136 . 3960099 . 2014PLoSO...988987S . free.
  2. Ferrante . Christophe . Furrer . Heinz . Martini . Rossana . Cavin . Lionel . 2023 . Revision of the Middle Triassic coelacanth Ticinepomis Rieppel 1980 (Actinistia, Latimeriidae) with paleobiological and paleoecological considerations . Swiss Journal of Palaeontology . 142 . 18 . 18 . 10.1186/s13358-023-00276-4 . 37706074 . 10495523 . free. 2023SwJP..142...18F .
  3. Rieppel . Olivier . 1985 . A second actinistian from the Middle Triassic of Monte San Giorgio, Kanton Tessin, Switzerland . Eclogae Geologicae Helvetiae . 78 . 707–713 . 10.5169/seals-165676.
  4. Renesto . Silvio . Stockar . Rudolf . 2018 . First Record of a Coelacanth Fish from the Middle Triassic Meride Limestone of Monte San Giorgio (Canton Ticino, Switzerland). Rivista Italiana di Paleontologia e Stratigrafia . en . 124 . 3 . 10.13130/2039-4942/10771 . 2039-4942.
  5. Rieppel . O. . A new coelacanth from the Middle Triassic of Monte San Giorgio, Switzerland . Eclogae Geologicae Helvetiae . 73 . 921–939 . 1980 . 3.
  6. Cavin . Lionel . H. . Furrer . C. . Obrist . New coelacanth material from the Middle Triassic of eastern Switzerland, and comments on the taxic diversity of actinistans . Swiss Journal of Geosciences . 106 . 2 . 2013 . 161–177 . 10.1007/s00015-013-0143-7 . 140189669 . free .
  7. Cavin . L. . Mennecart . B. . Obrist . C. . Costeur . L. . Furrer . H. . Heterochronic evolution explains novel body shape in a Triassic coelacanth from Switzerland . Scientific Reports . 7 . 1 . 2017 . 13695 . 10.1038/s41598-017-13796-0 . 29057913 . 5651877 . 2017NatSR...713695C .

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