Abstract
Middle Permian (Guadalupian) ostracods are described from the Williams Ranch Member of the Cutoff Formation (Roadian) and the McKittrick Canyon Member of the Bell Canyon Formation (Capitanian) from two sections exposed in Culberson County, Guadalupe Mountains, West Texas. Their taxonomy is discussed and adds to the scientific understanding of marine ostracod biodiversity and palaeobiogeography during the Middle Permian. Ostracod assemblages are represented by 51 species of 26 genera and 15 families. Eleven species are newly described: Healdia mckittrickensis Crasquin sp. nov., Healdia cutoffella Crasquin sp. nov., Aurikirkbya guadalupensis Crasquin sp. nov., Hollinella (Hollinella) williamsranchensis Crasquin sp. nov., Geisina culbersonensis Crasquin sp. nov., Paraparchites pecosensis Crasquin sp. nov., Bairdia elcapitanensis Forel sp. nov., Ceratobairdia mescaleroella Forel sp. nov., Ceratobairdia sexagintaduella Forel sp. nov., Ceratobairdia pratti Forel sp. nov., and Denticupachydomella bellcanyonensis Forel sp. nov. The diagnosis of the genus Denticupachydomella is emended. The palaeobiogeographic distribution of the species is analyzed and exemplifies the taxon exchanges between Tethyan and Panthalassic localities in the Permian. The eastern margin of the Palaeo-Tethyan realm is shown to have played a major role in radiation of taxa in the Permian.
Highlights
The Guadalupian Epoch, Middle Permian, witnessed major global changes, including the formation of the Pangaea supercontinent, the end of the Late Palaeozoic Ice Age, and sea-level changes as well as major biotic events (e.g., Shen et al 2020 and references therein)
In North America, Middle Permian ostracods have been described from the Guadalupian outcrops that are widespread in the Delaware Basin: in the Guadalupe, Apache and Glass mountains (Fig. 1)
Each of the 6 samples studied from the Middle Permian (Roadian and Capitanian) of the Guadalupe Mountains, West Texas, USA, yielded identifiable ostracods
Summary
The Guadalupian Epoch, Middle Permian, witnessed major global changes, including the formation of the Pangaea supercontinent, the end of the Late Palaeozoic Ice Age, and sea-level changes as well as major biotic events (e.g., Shen et al 2020 and references therein). It is acknowledged that Permian marine ostracod communities went through significant changes up to the end-Permian extinction (see Crasquin & Forel 2014 and Forel & Crasquin 2020 for reviews) but their response to the so-called end-Guadalupian mass extinction remains enigmatic. In North America, Middle Permian ostracods have been described from the Guadalupian outcrops that are widespread in the Delaware Basin: in the Guadalupe, Apache and Glass mountains (Fig. 1). The Guadalupe Mountains are the World stratotype area for the Middle Permian and the Guadalupe Mountains National Park contains the GSSPs for the Roadian, Wordian and Capitanian stages (Glenister et al 1999). The Guadalupian strata present in the Delaware Basin represent various palaeoenvironments from back reef, reef, fore reef to basinal
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