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A Review of the Fossil Record of Turtles of the Clade Thalassochelydia

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A Review of the Fossil Record of Turtles of the Clade Thalassochelydia POSTPRINT This is a postprint of the following peer-reviewed publication: Anquetin J, Püntener C, Joyce W. 2017. A review of the fossil record of turtles of the clade Thalassochelydia. Bulletin of the Peabody Museum of Natural History 58(2): 317–369. DOI of the peer-reviewed publication: 10.3374/014.058.0205 A review of the fossil record of turtles of the clade Thalassochelydia Jérémy Anquetin1*, Christian Püntener2, Walter G. Joyce3 1JURASSICA Museum, 2900 Porrentruy, Switzerland and Department of Geosciences, University of Fribourg, 1700 Fribourg, Switzerland—email: [email protected] 2Section d’archéologie et paléontologie, Office de la culture, République et Canton du Jura, 2900 Porrentruy, Switzerland— email: [email protected] 3Department of Geosciences, University of Fribourg, 1700 Fribourg, Switzerland—email: [email protected] *Corresponding author Abstract The Late Jurassic (Oxfordian to Tithonian) fossil record of Europe and South America has yielded a particularly rich assemblage of aquatic pan-cryptodiran turtles that are herein tentatively hypothesized to form a monophyletic group named Thalassochelydia. Thalassochelydians were traditionally referred to three families, Eurysternidae, Plesiochelyidae, and Thalassemydidae, but the current understanding of phylogenetic relationships is insufficient to support the monophyly of either group. Given their pervasive usage in the literature, however, these three names are herein retained informally. Relationships with marine turtles from the Cretaceous have been suggested in the past, but these hypotheses still lack strong character support. Thalassochelydians are universally found in near-shore marine sediments and show adaptations to aquatic habitats, but isotopic evidence hints at a broad spectrum of specializations ranging from freshwater aquatic to fully marine. A taxonomic review of the group concludes that of 68 named taxa, 27 are nomina valida, 18 are nomina invalida, 18 are nomina dubia, and 5 nomina oblita. Keywords Phylogeny, biogeography, Thalassochelydia, Late Jurassic, Early Cretaceous © 2017 Anquetin et al. CC-BY 4.0 This work is licensed under the Creative Commons Attribution 4.0 International License. Anquetin et al. — Fossil record of Thalassochelydia 1 / 62 POSTPRINT Introduction global revision of the group beyond what is being presented herein is still needed. Over the course of the last two centuries, rich fossil turtle “Plesiochelyids” and “thalassemydids” were first material has been recovered from Late Jurassic sediments described from the Kimmeridgian of Solothurn, exposed throughout Europe that documents the Switzerland. At the beginning of the 19th century, colonization of the island archipelago and shallow limestone quarries around Solothurn started to yield epicontinental seas that covered a large part of that many remains of relatively large turtles. These were continent at the time by basal pan-cryptodiran turtles. collected by Franz Joseph Hugi, who eventually sold his These taxa represent the first unambiguous radiation of collection to the city and was appointed as first director crown group turtles into marine environments. The to the new city museum (Meyer and Thüring 2009). Hugi majority of these turtles were traditionally referred to the sent information and specimens to Georges Cuvier in families Eurysternidae Dollo, 1886, Plesiochelyidae Baur, Paris, and some of these were figured in the second 1888, and Thalassemydidae Zittel, 1889, but the edition of his Recherches sur les ossemens fossiles (Cuvier relationships among these three groups and later groups 1824; Bräm 1965; Gaffney 1975a). These figured of marine turtles remain obscure (Joyce 2007; Cadena specimens were given various names during the 1830s and Parham 2015). As we find these terms to be useful, (Gray 1831; Keferstein 1834; Fitzinger 1835), but these are we herein place them in quotes to highlight that their now nomina oblita. The Solothurn turtles were first monophyly has not yet been rigorously demonstrated. thoroughly described by Rütimeyer (1873a), who coined Accumulating evidence suggests that all Late Jurassic the names Plesiochelys, Craspedochelys, Tropidemys, and coastal marine turtles from Europe form a monophyletic Thalassemys. In the meantime, “plesiochelyid” taxa had group, which is herein formally named Thalassochelydia. also been described from the Isle of Portland, England With the exception of one species from the Late Jurassic (Owen 1842), from the French and Swiss Jura Mountains (Tithonian) of Argentina (Fernández and de la Fuente (Pictet and Humbert 1857; Pictet 1860), from the region of 1988; de la Fuente and Fernández 2011) and a fragment Hannover in Germany (Maack 1869), and from the from the putative Early Cretaceous of Switzerland (Pictet regions of Le Havre and Boulogne-sur-Mer in northern and Campiche 1858–1860; Püntener et al. 2014), France (Lennier 1870; Sauvage 1872, 1873). thalassochelydian turtles are restricted to the Late Jurassic (Oxfordian to Tithonian) of western and central Initially, Rütimeyer (1873a) recognized 13 species of Europe. “plesiochelyids” and “thalassemydids” in Solothurn, although they were at the time classified within Emydidae “Eurysternids” were initially described from the and Chelydidae. Additional species were subsequently Tithonian of southern Germany, notably from the described from northern Germany (Portis 1878; Oertel lithographic limestone quarries of Solnhofen, Kelheim, 1924), northern France (Sauvage 1880; Bergounioux and Eichstätt (e.g., Meyer 1839b, 1839c, 1860, 1864). 1937), central western Portugal (Sauvage 1898), southern Thanks to their exceptional state of preservation, these Germany (Fraas 1903; Oertel 1915), and central southern were historically among the first fossil turtles to be England (Andrews 1921). Up until the present recognized as truly different from modern faunas and contribution, there has been no attempt to reevaluate the therefore placed in their own taxonomic units (genera). taxonomy of these turtles at the European scale. Instead, About ten species and seven genera were initially revisionary works focused mostly on the turtles from proposed. Unfortunately, despite the amount of well- Solothurn. Bräm (1965) was the first to propose a detailed preserved material that was available, many taxa were reassessment of the Solothurn turtle assemblage. Eight based on fragmentary remains. Additional “eurysternids” of the species initially described by Rütimeyer (1873a) were subsequently described from France (Thiollière were confirmed as valid and two new species were 1851; Meyer 1860; Jourdan 1862) and northern Germany created. Subsequent authors focused only on part of this (Maack 1869; Portis 1878). These turtles were extensively assemblage and reached diverging conclusions (Gaffney studied during the second part of the 19th century and 1975a; Antunes et al. 1988; Lapparent de Broin et al. early parts of the 20th century (e.g., Wagner 1861b; 1996). The most recent revision of these turtles Rütimeyer 1873a, 1873b; Zittel 1877a, 1877b; Lydekker concluded the validity of only six species out of the fifteen 1889b; Oertel 1915, 1924), but taxonomic conclusions historically described based on material from the Late varied greatly. After a substantial hiatus, the group has Jurassic of the Jura Mountains (Anquetin, Püntener and received more attention recently (e.g., Parsons and Billon-Bruyat 2014). This study is, however, far from Williams 1961; Wellnhofer 1967; Gaffney 1975b; Broin global as it focused only on a limited geographical region. 1994; Joyce 2000, 2003; Anquetin and Joyce 2014), but a Since Bräm (1965), new species have been described from southern England (Gaffney 1975a), southern Spain Anquetin et al. — Fossil record of Thalassochelydia 2 / 62 POSTPRINT (Slater et al. 2011), and, more recently, from northwestern skull is narrower and results in a more acute angle Switzerland (Anquetin et al. 2015; Püntener et al. 2015, between the two rami of the jaws. The skull of the 2017). eurysternid Solnhofia parsonsi is macrocephalic, about 40% of the carapace length, and characterized by an Most thalassochelydians were described during the elongated snout. The nasals are usually well-developed 19th and early 20th centuries. More than sixty species quadrangular elements, but they are reduced and were named based on material from Switzerland, triangular in Jurassichelon oleronensis (Figure 1). These Germany, England, and France notably, but few attempts elements contact one another along their entire length were made to synthesize a consistent taxonomy that and form the dorsal margin of the apertura narium spanned across the continent. Several reasons may externa. The prefrontals form the anterodorsal part of explain this situation. First, the whereabouts of many the orbit and contact one another in the midline for most specimens are uncertain. Second, several species are of their length in most species, although an anteromedial described based on relatively incomplete material. Third, process of the frontals may partly separate the the amount of literature relating to these turtles is prefrontals posteriorly. In contrast, the frontals contact difficult to oversee and some literature is difficult to the nasals anteriorly and fully separate the prefrontals in access. Finally, many specimens, including the types of Jurassichelon oleronensis (Figure 1) and Portlandemys several species, were destroyed, most as a result of World gracilis. In all species, an anterior process of the frontals War
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