TABLE 1 in The late Givetian (Middle Devonian) ammonoid Epitornoceras Frech, 1902 from Argentina (southwestern Gondwana)

TABLE 1. — Comparison of the morphological characteristics of the different species belonging to the genus Epitornoceras Frech,1902.Abbreviations: CWI, conch width index; UWI, umbilical width index; WER, whorl expansion rate; WWI, whorl width index.
MorphologicalEpitornocerasEpitornocerascharacters atEpitornocerastransmediterraneumdennisoniEpitornocerasthe adult stageEpitornoceras baldisimithracoidesKorn & Bockwinkel,Kirchgasser,peracutum(c. 30-50 mm dm)(Leanza, 1968)(Frech, 1888)2022Baird & Brett, 2020(Hall, 1876)Conch geometryExtremely discoidalThinly discoidalThinly discoidalThinly discoidalConch probably(CWI c. 0.25)(CWI c. 0.35)(CWI c. 0.35)(CWI c. 0.35)discoidalWhorl profile stronglyWhorl profileWhorl profileWhorl profileWhorl profile shapecompressedcompressedcompressedcompressedunknown(WWI c. 0.40)(WWI c. 0.65)(WWI c. 0.65)(WWI c. 0.65)Umbilicus closed atUmbilicus closed atUmbilicus closed atDiameter of umbilicalDiameter of umbilical30 mm dm50 mm dm50 mm dmclosure unknownclosure unknownUmbilical marginUmbilical marginUmbilical marginUmbilical marginUmbilical margincontinuously roundedcontinuously roundedobliquely flattenedcontinuously roundedcontinuously rounded(funnel-shaped)Flanks weakly convex, Flanks weakly convex, Flanks nearly parallelFlanks weakly convex,Flanks weakly convexconvergentconvergentconvergentSuture lineNarrow E lobeV-shaped E lobeV-shaped E lobeWide E lobe withWide E lobe withconvex flanksconcave flanksNearly symmetricAsymmetric A lobe,Nearly symmetricAsymmetric A lobe,Asymmetric A lobe,A lobe, wider thanas deep as wide,A lobe, deeper thanslightly wider thanvery deep, deeperdeepconvergent flankswide, parallel flanksdeepthan wide–––Flat-toppedDorsolateral saddledorsolateral saddleless wide