Back
Nannoceratopsis tricornuta
Nannoceratopsis tricornuta Wille and Gocht, 1979
Tax.jr. synonym of Nannoceratopsis triceras Drugg, 1978, according to Wille and Gocht, 1979.
Holotype: Wille and Gocht, 1979, fig.23
Locus typicus: Jebenhausen, Swabian Alb, S Germany
Stratum typicum: Early Toarcian
Original diagnosis: Wille and Gocht, 1979, p. 241-242
The laterally flattened body has an approximately triangular outline. Ventral lateral side convex, with a "ventral angle", dorsal lateral side straight to lightly convex. The posterior end tapers to three hornlike tips. A sagittal band is not developed. Wall single-layered and smooth.
In archaeopyle formation, the small epitract is half-detached by the dorsal tearing of the girdle zone.
Dimensions: holotype length (without epitract) 73 Ám, width 72 Ám.
Affinities: Wille and Gocht, 1979, p. 244
The new species differs from all species described up to now in the presence of three posterior horns. However, transitions to two-horned forms can be discerned, when the dorsal horn is reduced. In some purely two-horned specimens the relation to N. tricornuta can be concluded, because they show the same resistant and smooth wall, and because they lack a sagittal band.
Tax.jr. synonym of Nannoceratopsis triceras Drugg, 1978, according to Wille and Gocht, 1979.
Holotype: Wille and Gocht, 1979, fig.23
Locus typicus: Jebenhausen, Swabian Alb, S Germany
Stratum typicum: Early Toarcian
Original diagnosis: Wille and Gocht, 1979, p. 241-242
The laterally flattened body has an approximately triangular outline. Ventral lateral side convex, with a "ventral angle", dorsal lateral side straight to lightly convex. The posterior end tapers to three hornlike tips. A sagittal band is not developed. Wall single-layered and smooth.
In archaeopyle formation, the small epitract is half-detached by the dorsal tearing of the girdle zone.
Dimensions: holotype length (without epitract) 73 Ám, width 72 Ám.
Affinities: Wille and Gocht, 1979, p. 244
The new species differs from all species described up to now in the presence of three posterior horns. However, transitions to two-horned forms can be discerned, when the dorsal horn is reduced. In some purely two-horned specimens the relation to N. tricornuta can be concluded, because they show the same resistant and smooth wall, and because they lack a sagittal band.