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Eodinia mosaica
Eodinia mosaica (Dodekova, 1975) Berger, 1986
Now Mosaicodinium. Originally Ctenidodinium, subsequently Ctenidodinium?, thirdly Eodinia, fourthly (and now) Mosaicodinium.
Holotype: Dodekova, 1975, pl.1, figs1-3
Locus typicus: NE Bulgaria
Stratum typicum: Late Bathonian
Original description: Dodekova, 1975, p. 19: Ctenidodinium mosaicum
Spheroidal to subspheroidal dinoflagellate proximochorate cyst, halved by a laevorotatory spiral cingulum. The cinguium is narrow (4.65 Ám) and on the ventral side its two ends differing in anteroposterior position by one its breadth. The sulcus is also narrow. Extends from the middle of the epitract to the antapex. Reflected tabulation: 4", 1a, 6"", ?6c, 6""", 1p, 1pv, 1"""". The arrangenlent of the plates and the correlation between their dimensions is typical of the genus. Peculiar in the tabulation is the antapical plate which is inclined to the ventral side. The anterior intercalary plale is very small and lies between apical plates 2I and 3I. The endophragm is thick, the periphragm--thin and difficult to notice. The ornamentation of the two membranes is very complicated and its type reminds of the pillar structure in Gonyaulacysta aldorfellsis described by Gocht (1970, p.137). From the endophragm raise fibrous sheaves of varying form and breadth which touch the periphragm (pl.1, figs.5,6). In plan they have granular surface, and with its irregular outlines lend the mosaic appearance of the cyst. The length of the fibrous sheaves is different (from 1.55 to 7.75). At the places of the sutures they are larger. The surface of the endophragm between the sheaves is shaghreenate. The periphragm is smooth or slightly shagreenate. The sutures are marked by membraneous septa of varying length, with numerous perforations. They resemble irregularly interlaced and welded fringes. The distal margin of the septa is slightly denticulated or passes into fringes of varying length. The latter are hollow, covered with pores, some neighbouring fringes are proximally interlaced in complicated forms (pl. 1, fig.6). The fringes are hest developed in the lower margin of the cingulum (pl.1, figs.5,6) in the apex and thc antapex. At the intersection of the sutures larger processes form. No true apical horn, the apical prominence being formed by the confluence of septa and fibrous sheaves. Its length depends upon the length of the crests. The archaeopyle is epitractal (type (AP)).
Affinities:
Dodekova, 1975, p. 19: Ctenidodinium mosaicum
The complicated ornamentation of C. mosaicum distinguishes the new species from all known representatives of the genus.
Berger, 1986, p. 344:
The double wall (underlined by the mosaic aspect), the epicystal archeopyle and the apical horn justify the transfer from the genus Ctenidodinium to the genus Eodinia.
Now Mosaicodinium. Originally Ctenidodinium, subsequently Ctenidodinium?, thirdly Eodinia, fourthly (and now) Mosaicodinium.
Holotype: Dodekova, 1975, pl.1, figs1-3
Locus typicus: NE Bulgaria
Stratum typicum: Late Bathonian
Original description: Dodekova, 1975, p. 19: Ctenidodinium mosaicum
Spheroidal to subspheroidal dinoflagellate proximochorate cyst, halved by a laevorotatory spiral cingulum. The cinguium is narrow (4.65 Ám) and on the ventral side its two ends differing in anteroposterior position by one its breadth. The sulcus is also narrow. Extends from the middle of the epitract to the antapex. Reflected tabulation: 4", 1a, 6"", ?6c, 6""", 1p, 1pv, 1"""". The arrangenlent of the plates and the correlation between their dimensions is typical of the genus. Peculiar in the tabulation is the antapical plate which is inclined to the ventral side. The anterior intercalary plale is very small and lies between apical plates 2I and 3I. The endophragm is thick, the periphragm--thin and difficult to notice. The ornamentation of the two membranes is very complicated and its type reminds of the pillar structure in Gonyaulacysta aldorfellsis described by Gocht (1970, p.137). From the endophragm raise fibrous sheaves of varying form and breadth which touch the periphragm (pl.1, figs.5,6). In plan they have granular surface, and with its irregular outlines lend the mosaic appearance of the cyst. The length of the fibrous sheaves is different (from 1.55 to 7.75). At the places of the sutures they are larger. The surface of the endophragm between the sheaves is shaghreenate. The periphragm is smooth or slightly shagreenate. The sutures are marked by membraneous septa of varying length, with numerous perforations. They resemble irregularly interlaced and welded fringes. The distal margin of the septa is slightly denticulated or passes into fringes of varying length. The latter are hollow, covered with pores, some neighbouring fringes are proximally interlaced in complicated forms (pl. 1, fig.6). The fringes are hest developed in the lower margin of the cingulum (pl.1, figs.5,6) in the apex and thc antapex. At the intersection of the sutures larger processes form. No true apical horn, the apical prominence being formed by the confluence of septa and fibrous sheaves. Its length depends upon the length of the crests. The archaeopyle is epitractal (type (AP)).
Affinities:
Dodekova, 1975, p. 19: Ctenidodinium mosaicum
The complicated ornamentation of C. mosaicum distinguishes the new species from all known representatives of the genus.
Berger, 1986, p. 344:
The double wall (underlined by the mosaic aspect), the epicystal archeopyle and the apical horn justify the transfer from the genus Ctenidodinium to the genus Eodinia.