Back
Nannoceratopsis triceras
Nannoceratopsis triceras Drugg, 1978
Tax. sr. synonym of Nannoceratopsis tricornuta Wille and Gocht, 1979, according to Wille and Gocht, 1979.
Holotype: Drugg 1978, pl.6, fig.12
Isotypes: Drugg, 1978 pl.6, figs.10,11
Locus typicus: Moorberg, Saxony, Germany
Stratum typicum: Aalenian-Callovian
--------------------------------------------------
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Nannoceratopsis triceras Drugg, 1978, has three antapical horns, which are not quite in the same plane. Many specimens have a hump or shoulder about midway on the ventral side. Surface smooth to finely granulate. Size: length 57-75 µm, width 52-62 µm.
--------------------------------------------------
Original description: Drugg, 1978, p. 71
Cyst basically arrow-shaped with three antapical horns. These three horns are not quite in the same plane although the cyst as a whole is flattened. The horns are broad proximally and pointed to slightly rounded distally. The lateral edges of the cyst are often straight and more or less equal in length. Many specimens, however, exhibit a hump or shoulder about midway on the ventral side. The archeopyle is located high on the cyst and is developed in the same manner as that of other species of Nannoceratopsis. The paracingulum is not clearly expressed. The cyst wall is thin and the surface is smooth to finely granulate. The length of the cyst ranges from 57 to 75 Ám with most specimens measuring about 62 Ám. The width ranges from 52 to 62 Ám.
Affinities:
Drugg, 1978, p. 71: This species bears a superficial resemblance to Palaeotetradinium silicorum Deflandre, 1936. The basic outline and mode of archeopyle formation clearly show that the new species is a Nannoceratopsis unless one considers the presence of three antapical horns sufficient reason to erect a new genus. The specific epithet triceras is in reference to the three antapical horns.
Poulsen 1996 p.56 Pl. 40, Fig. 7
Recorded occurrence. Denmark: Luehndea spinosa Zone, Subzone b - Parvocysta nasuta Subzone, Mancodinium semilabulatum Zone, uncertain in the earliest Middle Jurassic.
Tax. sr. synonym of Nannoceratopsis tricornuta Wille and Gocht, 1979, according to Wille and Gocht, 1979.
Holotype: Drugg 1978, pl.6, fig.12
Isotypes: Drugg, 1978 pl.6, figs.10,11
Locus typicus: Moorberg, Saxony, Germany
Stratum typicum: Aalenian-Callovian
--------------------------------------------------
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Nannoceratopsis triceras Drugg, 1978, has three antapical horns, which are not quite in the same plane. Many specimens have a hump or shoulder about midway on the ventral side. Surface smooth to finely granulate. Size: length 57-75 µm, width 52-62 µm.
--------------------------------------------------
Original description: Drugg, 1978, p. 71
Cyst basically arrow-shaped with three antapical horns. These three horns are not quite in the same plane although the cyst as a whole is flattened. The horns are broad proximally and pointed to slightly rounded distally. The lateral edges of the cyst are often straight and more or less equal in length. Many specimens, however, exhibit a hump or shoulder about midway on the ventral side. The archeopyle is located high on the cyst and is developed in the same manner as that of other species of Nannoceratopsis. The paracingulum is not clearly expressed. The cyst wall is thin and the surface is smooth to finely granulate. The length of the cyst ranges from 57 to 75 Ám with most specimens measuring about 62 Ám. The width ranges from 52 to 62 Ám.
Affinities:
Drugg, 1978, p. 71: This species bears a superficial resemblance to Palaeotetradinium silicorum Deflandre, 1936. The basic outline and mode of archeopyle formation clearly show that the new species is a Nannoceratopsis unless one considers the presence of three antapical horns sufficient reason to erect a new genus. The specific epithet triceras is in reference to the three antapical horns.
Poulsen 1996 p.56 Pl. 40, Fig. 7
Recorded occurrence. Denmark: Luehndea spinosa Zone, Subzone b - Parvocysta nasuta Subzone, Mancodinium semilabulatum Zone, uncertain in the earliest Middle Jurassic.