Rhinoclemmys panamaensis

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Rhinoclemmys panamaensis
Temporal range: Early-Mid Miocene (Hemingfordian)
19–16  Ma
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Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Testudines
Suborder: Cryptodira
Superfamily: Testudinoidea
Family: Geoemydidae
Genus: Rhinoclemmys
Species:
R. panamaensis
Binomial name
Rhinoclemmys panamaensis
Cadena et al. 2012

Rhinoclemmys panamaensis [1] is an extinct species of turtle belonging to the genus Rhinoclemmys of the family Geoemydidae known from the early to middle Miocene (Hemingfordian) Cucaracha Formation of the Panama Basin of central Panama.

Contents

Paleoecology

In 2010, the holotype specimen was recovered from the Cucaracha Formation located at the western side of the Centenario Bridge in the Panama Canal Zone. [2] The same formation has provided fossils of the crocodylian Centenariosuchus , [3] and the artiodactyl Paratoceras . [4]

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Tsoabichi is an extinct genus of caimanine crocodylian. Fossils are known from the Green River Formation in Wyoming, and date back to the Ypresian stage of the Eocene. The genus was named and described in 2010 by paleontologist Christopher A. Brochu, with the type species being Tsoabichi greenriverensis. According to the current understanding of caiman evolutionary relationships, Tsoabichi is a basal member of Caimaninae and may have evolved after caimans dispersed into North America from northern and central South America, their main center of diversity in the Cenozoic.

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Culebrasuchus is an extinct, monotypic genus of caiman alligatorid known from the Early to Middle Miocene (Hemingfordian) of the Panama Canal Zone of Panama. It contains a single species, Culebrasuchus mesoamericanus.

Centenariosuchus is an extinct genus of caimanine crocodylian known from the Miocene of the Panama Canal Zone of Panama. It contains a single species, Centenariosuchus gilmorei, that was named in 2013 in honor of the upcoming centennial anniversary of the digging of the Panama Canal. Two fossil specimens consisting of skull fragments were found in the Early to Middle Miocene Cucaracha Formation in 2009 and 2011, and may belong to a single individual. The species is diagnosed by a combination of skull features that it shares with basal caimans like Tsoabichi, Eocaiman, Culebrasuchus, and the living genus Paleosuchus, as well as more derived caimans such as those in the genus Caiman. One feature that distinguishes Centenariosuchus from all other caimans is the straight outer margin of a hole on the underside of the skull called the suborbital fenestra. According to one phylogenetic analysis of caimanine relationships, Centenariosuchus falls within a clade or evolutionary grouping of caimans that includes the very large and highly specialized forms Purussaurus and Mourasuchus, known from the Miocene of South America.

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The Cucaracha Formation (Tca) is a geologic formation in Panama. It preserves vertebrate and plant fossils dating back to the Neogene period; Early to Middle Miocene epochs (Hemingfordian). Fossils of the crocodylian Centenariosuchus, the turtle Rhinoclemmys panamaensis and the artiodactyl Paratoceras have been found in the formation.

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<i>Alligator olseni</i> Extinct species of reptile

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References

  1. Cadena et al., 2012
  2. MacFadden et al., 2010
  3. Hastings et al., 2013
  4. Rincón et al., 2015

Bibliography