Ross, C. A. (1964). Two significant fusulinid genera from Word Formation (Permian), Texas. Journal of Paleontology. 38(2): 311-315.

300620

Ross, C. A.

1964

38(2): 311-315

Publication

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The new schwagerinid genus Skinnerina, type species S. typicalis, n. sp., in the lower part of the Word Formation, Glass Mountains, Texas, has a thickly fusiform test, two or more irregular tunnels in its later volutions, and thick secondary deposits on the septal folds. This genus differs from its apparent ancestor, Parafusulina, in having more than one tunnel and it differs from Polydiexodina in shape and in having fewer and more irregular tunnels. Skinnerina is an early Guadalupian side branch from Parafusulina in the phylogeny of the subfamily Schwagerininae. It is not directly related to the late Guadalupian genus Polydiexodina which arose from a different lineage of Parafusulina. The species Rauserella erratica Dunbar from the lower part of the Word Formation is a new and significant occurrence of the distinct but rare genus Rauserella. This occurrence of the genus extends its range nearly to the base of the Guadalupian in the west Texas region.

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