Fossil spiders (Araneae) from the Eocene Green River Formation of Colorado

Selden, Paul A.; Wang, Yinan.

doi:10.15298/arthsel.23.2.10

Cited by 3 publications

(2 citation statements)

References 10 publications

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“…The orbweaving spider Greenwaltarachne pamelae is easily recognizable from the striped pattern on its legs and four other spiders from this deposit appear to be the same species. Orbweaving spiders are also found in the Green River Formation (Selden and Wang, 2014), although not of the FIGURE 5. Specimen PAL 20480 Gnaphosidae incertae sedis photograph and interpretive drawing.…”

Section: Discussionmentioning

confidence: 99%

Fossil spiders (Araneae) from the Eocene Kishenehn Formation of Montana, USA

Downen

Selden

2020

Palaeontol Electron

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The Kishenehn Formation contains a diverse assemblage of terrestrial arthropod fossils and represents a tropical ecosystem in North America during the Eocene (46 Ma). Most of the fossils are small insects, but spiders have also been recovered and recently made available for study. The fossil spiders are small and preserved as compressions in a thinly laminated oil shale, but abundant setae and other morphological features are preserved in relatively high detail. Here, the fossil spiders are described for the first time and include new species of orbweaving spiders from the family Araneidae and a ground-dwelling spider from the family Gnaphosidae. Most of the spiders in the assemblage resemble extant orbweaving spiders like Neoscona: Greenwaltarachne pamelae gen. & sp. nov. and Consteniusi leonae gen. et sp. nov.. A single gnaphosid, distinguished by widely separated cylindrical spinnerets, is likely a juvenile. A single male spider belonging to Araneomorphae is too poorly preserved to discern at family level. The fossils described here are the oldest fossil spiders recovered from Montana thus far.

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Section: Discussionmentioning

confidence: 99%

Fossil spiders (Araneae) from the Eocene Kishenehn Formation of Montana, USA

Downen

Selden

2020

Palaeontol Electron

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“…of ! Eocene of Germany (Wunderlich, 1986), Florissant and Green River, USA (Licht, 1986;Selden & Wang, 2014), and British Columbia, Canada (Selden & Penney, 2009); the early Cretaceous of El Montsec and Las Hoyas, Spain (Selden, 1989(Selden, , 1990(Selden, , 1991a(Selden, ,b, 2014a, Siberia and Mongolia (Eskov & Zonstein, 1990), Victoria, Australia (Jell & Duncan, 1986), Mexico (Feldmann et al, 1998), and north-east China (Selden, Ren & Shih, 2016); the Jurassic of Transbaikalia and Kazakhstan (Eskov, 1984(Eskov, , 1987Selden, 2012), and north-east China (Selden, Huang & Ren, 2008;Selden & Huang, 2010;Selden, Shih & Ren, 2011;Selden, Ren & Shih, 2016); the Triassic of France (Selden & Gall, 1992), South Africa (Selden et al, 1999;Selden, Anderson & Anderson, 2009) and Italy (Dalla Vecchia & Selden, 2013); the Permian of the Ural Mountains, Russia (Eskov & Selden, 2005); and the late Devonian of Gilboa, New York (Selden, Shear & Bonamo, 1991). The Palaeozoic occurrences are of uraraneids, which were originally described as spiders but now form their own arachnid order (Selden, Shear & Sutton, 2008b).…”

Section: Rock Matrix Preservationmentioning

confidence: 99%

Imaging techniques in the study of fossil spiders

Selden

Penney

2017

Earth-Science Reviews

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Towards a synthesis of the Caribbean biogeography of terrestrial arthropods

Crews

Esposito

2020

BMC Evol Biol

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Background: The immense geologic and ecological complexity of the Caribbean has created a natural laboratory for interpreting when and how organisms disperse through time and space. However, competing hypotheses compounded with this complexity have resulted in a lack of unifying principles of biogeography for the region. Though new data concerning the timing of geologic events and dispersal events are emerging, powerful new analytical tools now allow for explicit hypothesis testing. Arthropods, with varying dispersal ability and high levels of endemism in the Caribbean, are an important, albeit understudied, biogeographic model system. Herein, we include a comprehensive analysis of every publicly available genetic dataset (at the time of writing) of terrestrial Caribbean arthropod groups using a statistically robust pipeline to explicitly test the current extent of biogeographic hypotheses for the region. Results: Our findings indicate several important biogeographic generalizations for the region: the South American continent is the predominant origin of Caribbean arthropod fauna; GAARlandia played a role for some taxa in aiding dispersal from South America to the Greater Antilles; founder event dispersal explains the majority of dispersal events by terrestrial arthropods, and distance between landmasses is important for dispersal; most dispersal events occurred via island hopping; there is evidence of 'reverse' dispersal from islands to the mainland; dispersal across the present-day Isthmus of Panama generally occurred prior to 3 mya; the Greater Antilles harbor more lineage diversity than the Lesser Antilles, and the larger Greater Antilles typically have greater lineage diversity than the smaller islands; basal Caribbean taxa are primarily distributed in the Greater Antilles, the basal-most being from Cuba, and derived taxa are mostly distributed in the Lesser Antilles; Jamaican taxa are usually endemic and monophyletic. Conclusions: Given the diversity and deep history of terrestrial arthropods, incongruence of biogeographic patterns is expected, but focusing on both similarities and differences among divergent taxa with disparate life histories emphasizes the importance of particular qualities responsible for resulting diversification patterns. Furthermore, this study provides an analytical toolkit that can be used to guide researchers interested in answering questions pertaining to Caribbean biogeography using explicit hypothesis testing.

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Fossil spiders (Araneae) from the Eocene Green River Formation of Colorado

Cited by 3 publications

References 10 publications

Fossil spiders (Araneae) from the Eocene Kishenehn Formation of Montana, USA

Fossil spiders (Araneae) from the Eocene Kishenehn Formation of Montana, USA

Imaging techniques in the study of fossil spiders

Towards a synthesis of the Caribbean biogeography of terrestrial arthropods

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