Ticinepomis

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Ticinepomis
Temporal range: Lower Ladinian, 240.91  Ma
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Ticinepomis peyeri.JPG
Fossil
Ticinepomis peyeri reconstruction.jpg
Reconstruction
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Chordata
Order: Coelacanthiformes
Family: Latimeriidae
Genus: Ticinepomis
Rieppel, 1980
Type species
Ticinepomis peyeri
Rieppel, 1980
Marine life of the Early and early Middle Triassic: Ticinepomis (13) Triassic marine vertebrate apex predators.png
Marine life of the Early and early Middle Triassic: Ticinepomis (13)

Ticinepomis is an extinct genus of coelacanth lobe-finned fish which lived during the Middle Triassic period in what is now Switzerland. It contains a single species, T. peyeri. T. peyeri specimens are most common in the Besano Formation (or Grenzbitumenzone) of Monte San Giorgio in Ticino. [2] 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 Graubünden. [5]

Ticinepomis was originally described as being a member of the family Coelacanthidae, being similar to Coelacanthus , Holophagus and Undina . [2] Later, T. peyeri was placed in Latimeriidae. [5] The bizarre Prosanto Formation latimeriid Foreyia is thought to be T. peyeri's closest relative, as they share many features despite their drastically contrasting appearances. [6]

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<i>Silvestrosaurus</i> Extinct genus of reptiles

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Acronemus is an extinct genus of euselachian shark from the Middle Triassic of Switzerland. It is an enigmatic genus of shark with uncertain relations to other sharks. Though originally placed within Ctenacanthiformes, it is now considered Euselachii incertae sedis, due to its mixture of features similar to hybodontiforms and neoselachians. Originally, teeth from this genus were attributed to "Acrodus bicarinatus" while fin spines were named "Nemacanthus tuberculatus". Associated material showed they were the same animal, with the older specific epithet (tuberculatus) taking precedence. The shark was given the new genus Acrocnemus, containing a single species. Acronemus is found in the Anisian-age Grenzbitumenzone of Monte San Giorgio.

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The San Salvatore Dolomite, sometimes known as the Salvatore Dolomite or San Salvatore Formation, is a Middle Triassic geological formation in Switzerland and Italy. The primarily lithology is micritic dolomite with a high proportion of algal mounds (stromatolites). It corresponds to a thick warm-water carbonate platform on the northern edge of an island in what is now the Po Plain. This formation and its local equivalents are common in the hills around Lake Maggiore, Varese, and Lugano, preserving fossils of marine invertebrates such as ammonoids, gastropods, and bivalves. At its eastern extent, the San Salvatore Dolomite is overlain by black shales of the Besano Formation, which was deposited in a deeper and more anoxic lagoon.

References

  1. Scheyer et al. (2014): Early Triassic Marine Biotic Recovery: The Predators' Perspective. PLoS ONE https://doi.org/10.1371/journal.pone.0088987
  2. 1 2 Rieppel, O. (1980). "A new coelacanth from the Middle Triassic of Monte San Giorgio, Switzerland". Eclogae Geologicae Helvetiae. 73 (3): 921–939.
  3. Rieppel, Olivier (1985). "A second actinistian from the Middle Triassic of Monte San Giorgio, Kanton Tessin, Switzerland". Eclogae Geologicae Helvetiae. 78: 707–713. doi: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)" (PDF). Rivista Italiana di Paleontologia e Stratigrafia. 124 (3). doi:10.13130/2039-4942/10771. ISSN   2039-4942.
  5. 1 2 Cavin, Lionel; Furrer, H.; Obrist, C. (2013). "New coelacanth material from the Middle Triassic of eastern Switzerland, and comments on the taxic diversity of actinistans". Swiss Journal of Geosciences. 106 (2): 161–177. doi:10.1007/s00015-013-0143-7. S2CID   140189669.
  6. Cavin, L.; Mennecart, B.; Obrist, C.; Costeur, L.; Furrer, H. (2017). "Heterochronic evolution explains novel body shape in a Triassic coelacanth from Switzerland". Scientific Reports. 7 (1): 13695. Bibcode:2017NatSR...713695C. doi:10.1038/s41598-017-13796-0. PMC   5651877 . PMID   29057913.