A New Classification on the Subfamily Schwagerininae

Abstract

Recently, the classification of Fusulinids, especially subfamily Schwagerininae, is too much specialized and there are many confusions among the scientists. In view of this fact, I have attempted to classify them systematically from the stand point of following five remarks. 1. Folding of septa is devided into next three degrees-regular, irregular and weak. 2. Thickness of spirotheca in outer volution is devided into two groups-thick and thin, separated by a boundary of 100μ. 3. Coiling manner in inner volution-Tighly and Loosely. 4. External form-Rounded, Bulged, Fusiform, Elongated fusiform, Elongated cylindrical. 5. Size-Large, Medium, Small. From the above five points, I made a table and plate which is forwarding to you under separate cover. Their specific names were followed with "form species" which Shimer and Shrock had already stated in the "Index fossils-of North America". These form species may be grouped into five genera and four subgenera-such as, genus 1. Para fusulina, 2. Schwagerina, 3. Pseudo fusuling, 4. Pseudoschwagerina, 5. Fujimotoella, subgenns 6. Paleofusulina 7. Sehellwienia 8. Paraschwagerina, 9. Zellia