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Wetzeliella gochtii
Wetzeliella gochtii Costa and Downie, 1976
Holotype: Costa and Downie, 1976, pl.92, fig.2
Locus typicus: Rupel Clay, Belgium
Stratum typicum: Middle Oligocene
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G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999
Wetzeliella gochtii Costa and Downie, 1976. According to Costa and Downie (1976, p.609-610), Wetzeliella gochtii has a subpentagonal pericyst with endocyst filling most of it so that there is a narrow ambital pericoel. All horns reduced to short, blunt projections or absent. The right antapical horn when present is markedly shorter than the left antapical horn. Abundant processes variable in shape, usually rather flexible, open or closed distally. When open, the distal margin may be aculeate or entire. Archeopyle soleiform. Wetzeliella gochtii has a soleiform archeopyle. Size: overall length 107-118 µm, width 98-111 µm, apical horn 0-13 µm, lateral horns 4-10 µm, right antapical horn 5-12 µm, left antapical horn 0-5 µm, process length 5-18 µm.
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Original description: Costa and Downie 1976, p. 609-610: Wetzeliella (Wetzeliella) gochtii
Diagnosis: A species of Wetzeliella (Wetzeliella) with usually subpentagonal tests. Endoblast following closely the periblast outline but leaving a narrow and well-defined pericoel. All horns reduced to short, blunt projections or absent. The right antapical horn, when present, is markedly shorter than the left antapical horn. Abundant processes, variable in shape, usually rather flexible, open or closed distally.
Dimensions: Range: overall length: 107-118 µm; overall breadth: 98-111 µm; apical horn: 0-13 µm; lateral horns: 4-10 µm; antapical horn right: 5-12 µm; antapical horn left: 0-5 µm; process length: 5-18 µm. Number of specimens measured: 6. Description: Due to the variable development of the horns, the tracts may be subpentagonal, subrhombic, or subcircular, pentagonal outlines being dominant; in all cases the outline is rounded. The horns, when present, are very short, broad, and blunt. The endophragm lies close to the periphragm but there is always a well-defined, although narrow, pericoel, often continuous around the endoblast. The processes vary in shape and characters of the distal endings. Most commonly they are thin-walled, flexible, and frequently with tapering bases. They may be open or closed distally; when open, the distal margin is aculeate or entire, when closed, the distal ending is simple, acuminate, or capitate. In all specimens observed the opercula are in situ and the archeopyle sutures are frequently difficult to observe.
Affinities:
Costa and Downie 1976, p. 610: Wetzeliella (Wetzeliella) gochtii
This species resembles W.(W.)symmetrica in the flexible, usually thin-walled processes, but differs from it by having all horn reduced or absent and a more rounded and commonly subpentagonal outline in contrast to the rhombic outlines with four well-developed horns characteristic of W.(W.)symmetrica. Some subcircular individuals of this species resemble W.(A.)homomorpha, from which they are distinguishable by the well-defined pericoel. W.(W.)ovalis also has reduced horns and rounded outlines, but its antapical horns are of about the same length and its processes are shorter, usually thicker-walled, and more rigid than in W.(W.) gochtii.
Holotype: Costa and Downie, 1976, pl.92, fig.2
Locus typicus: Rupel Clay, Belgium
Stratum typicum: Middle Oligocene
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G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999
Wetzeliella gochtii Costa and Downie, 1976. According to Costa and Downie (1976, p.609-610), Wetzeliella gochtii has a subpentagonal pericyst with endocyst filling most of it so that there is a narrow ambital pericoel. All horns reduced to short, blunt projections or absent. The right antapical horn when present is markedly shorter than the left antapical horn. Abundant processes variable in shape, usually rather flexible, open or closed distally. When open, the distal margin may be aculeate or entire. Archeopyle soleiform. Wetzeliella gochtii has a soleiform archeopyle. Size: overall length 107-118 µm, width 98-111 µm, apical horn 0-13 µm, lateral horns 4-10 µm, right antapical horn 5-12 µm, left antapical horn 0-5 µm, process length 5-18 µm.
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Original description: Costa and Downie 1976, p. 609-610: Wetzeliella (Wetzeliella) gochtii
Diagnosis: A species of Wetzeliella (Wetzeliella) with usually subpentagonal tests. Endoblast following closely the periblast outline but leaving a narrow and well-defined pericoel. All horns reduced to short, blunt projections or absent. The right antapical horn, when present, is markedly shorter than the left antapical horn. Abundant processes, variable in shape, usually rather flexible, open or closed distally.
Dimensions: Range: overall length: 107-118 µm; overall breadth: 98-111 µm; apical horn: 0-13 µm; lateral horns: 4-10 µm; antapical horn right: 5-12 µm; antapical horn left: 0-5 µm; process length: 5-18 µm. Number of specimens measured: 6. Description: Due to the variable development of the horns, the tracts may be subpentagonal, subrhombic, or subcircular, pentagonal outlines being dominant; in all cases the outline is rounded. The horns, when present, are very short, broad, and blunt. The endophragm lies close to the periphragm but there is always a well-defined, although narrow, pericoel, often continuous around the endoblast. The processes vary in shape and characters of the distal endings. Most commonly they are thin-walled, flexible, and frequently with tapering bases. They may be open or closed distally; when open, the distal margin is aculeate or entire, when closed, the distal ending is simple, acuminate, or capitate. In all specimens observed the opercula are in situ and the archeopyle sutures are frequently difficult to observe.
Affinities:
Costa and Downie 1976, p. 610: Wetzeliella (Wetzeliella) gochtii
This species resembles W.(W.)symmetrica in the flexible, usually thin-walled processes, but differs from it by having all horn reduced or absent and a more rounded and commonly subpentagonal outline in contrast to the rhombic outlines with four well-developed horns characteristic of W.(W.)symmetrica. Some subcircular individuals of this species resemble W.(A.)homomorpha, from which they are distinguishable by the well-defined pericoel. W.(W.)ovalis also has reduced horns and rounded outlines, but its antapical horns are of about the same length and its processes are shorter, usually thicker-walled, and more rigid than in W.(W.) gochtii.