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Gochteodinia verrucosa
Gochteodinia verrucosa (Vozzhennikova, 1967) Dörhöfer and Davies, 1980; emend. Lentin and Vozzhennikova, 1990
Originally Imbatodinium, subsequently Pareodinia, thirdly (and now) Gochteodinia.
Holotype: Vozzhennikova, 1967, pl.12, fig.6; Lentin and Vozzhennikova, 1990, pl.11, fig.5, text-fig.46
Locus typicus: Moscow Regin, Russia
Stratum typicum: Late Jurassic
Translation Vozzhennikova, 1967: Lentin and Vozzhennikova, 1990
Original description: Vozzhennikova, 1967, p.56: Imbatodinium verrucosum
Theca pyriform with slightly convex sides, a small apical process and a broadly rounded antapex. The annulate transverse furrow divides the theca into two unequal parts. Epitheca two to two and one half times the size of the hypotheca. At the distal end of the apical process there is a short, curved ant bluntly, rounded tip. Hypotheca short with two antapical processes, one of which is broadly rounded and the other is smaller in size and indeterminate in outline. The surface of the envelope is finely granular and covered with short, stout, tuberculate projections. The color of the envelope is dark yellow.
Remark: Dörhöfer and Davies, 1980, p.30
The species is here transferred to Gochteodinia because of the apetate ornament. Specimens from the Canadian Arctic have penitabular elements, ranging from low verrucae to short baculae; intergradiations to G.-villosa-type ornamentation have been observed. The archaeopyle is 2I.
Emended description: Lentin and Vozzhennikova, 1990, p.84
Cyst shape elongate oval with one apical horn, without antapical horns, antapex rounded. Autophragm ornamented with short, flat-topped tuberculate processes and dense granules which are randomly distributed over the surface of the cyst; processes increase in size and density towards the antapex. The anterior tip of the apical horn ornamented with a single, solid process with a bulb-shaped tip. Paratabulation indicated only by location of the archeopyle. Archeopyle 2I resulting from the loss of two intercalary paraplates; operculum free.
Paracingulum and parasulcus not indicated.
Size: Holotype length 70 Ám, width 30 Ám. Species based on 2 specimens.
Affinities:
Lentin and Vozzhennikova, 1990, p. 84-85: This species is very similar to Gocbteodinia villosa but is smaller and has short tuberculate processes and granulation rather than long, slender processes. The emendation is necessary because the original diagnosis indicates that a paracingulum ("transverse furrow") is present, but the holotype lacks a paracingulum. In addition the tetails of the archeopyle are given, although the 2I intercalary archeopyle has assumed by Dörhöfer and Davies, 1980 when they transfered this species to Gochteodinia. These authors also report penitabular ornament for specimens they attributed to G. verrucosa (not illustrated). However, the process distribution is random on the holotype. We feel that if the specimens observed by these authors show any form of organization of the processes, they are not Gochteodinia verrucosa s. s.
Originally Imbatodinium, subsequently Pareodinia, thirdly (and now) Gochteodinia.
Holotype: Vozzhennikova, 1967, pl.12, fig.6; Lentin and Vozzhennikova, 1990, pl.11, fig.5, text-fig.46
Locus typicus: Moscow Regin, Russia
Stratum typicum: Late Jurassic
Translation Vozzhennikova, 1967: Lentin and Vozzhennikova, 1990
Original description: Vozzhennikova, 1967, p.56: Imbatodinium verrucosum
Theca pyriform with slightly convex sides, a small apical process and a broadly rounded antapex. The annulate transverse furrow divides the theca into two unequal parts. Epitheca two to two and one half times the size of the hypotheca. At the distal end of the apical process there is a short, curved ant bluntly, rounded tip. Hypotheca short with two antapical processes, one of which is broadly rounded and the other is smaller in size and indeterminate in outline. The surface of the envelope is finely granular and covered with short, stout, tuberculate projections. The color of the envelope is dark yellow.
Remark: Dörhöfer and Davies, 1980, p.30
The species is here transferred to Gochteodinia because of the apetate ornament. Specimens from the Canadian Arctic have penitabular elements, ranging from low verrucae to short baculae; intergradiations to G.-villosa-type ornamentation have been observed. The archaeopyle is 2I.
Emended description: Lentin and Vozzhennikova, 1990, p.84
Cyst shape elongate oval with one apical horn, without antapical horns, antapex rounded. Autophragm ornamented with short, flat-topped tuberculate processes and dense granules which are randomly distributed over the surface of the cyst; processes increase in size and density towards the antapex. The anterior tip of the apical horn ornamented with a single, solid process with a bulb-shaped tip. Paratabulation indicated only by location of the archeopyle. Archeopyle 2I resulting from the loss of two intercalary paraplates; operculum free.
Paracingulum and parasulcus not indicated.
Size: Holotype length 70 Ám, width 30 Ám. Species based on 2 specimens.
Affinities:
Lentin and Vozzhennikova, 1990, p. 84-85: This species is very similar to Gocbteodinia villosa but is smaller and has short tuberculate processes and granulation rather than long, slender processes. The emendation is necessary because the original diagnosis indicates that a paracingulum ("transverse furrow") is present, but the holotype lacks a paracingulum. In addition the tetails of the archeopyle are given, although the 2I intercalary archeopyle has assumed by Dörhöfer and Davies, 1980 when they transfered this species to Gochteodinia. These authors also report penitabular ornament for specimens they attributed to G. verrucosa (not illustrated). However, the process distribution is random on the holotype. We feel that if the specimens observed by these authors show any form of organization of the processes, they are not Gochteodinia verrucosa s. s.