Kozlowskiellina (Boucot 1958) is a new genera for me. When I first saw the shell below I immediately thought it was a Delthyris. The specimen shown below is possibly K. velata based on the book "Stratigraphy and Paleontology of the Hunton Group in the Arbuckle Mountain Region" 1958 Thomas Amsden and Arthur Boucot, Oklahoma Geological Survey, Bulletin 78 pgs:121-124. This species is similar to the genera Delthyris and species Spirifer perlamellosa but I am deferring identification to Amsden and Boucot since they, quite literally, wrote the book on brachiopods from the Haragan formation.
This specimen came from an old estate collection of fossils that were collected in the 1960's to 1970's from the Haragan Formation at White Mound, OK. The Haragan formation is thought to range from the upper Silurain, 418mya, to the lower Devonian, 411mya (Pridoli to Lochkovian). This would correspond to the Birdsong shale of Tennessee and the Helderberg Fauna of New York, Pennsylvania and Maryland.
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