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Caligodinium endoreticulum
Caligodinium endoreticulatum, Stover and Hardenbol, 1994, p.34, pl.1, figs.3a–b,4.
Holotype: Stover and Hardenbol, 1994, Plate 1, Figures 3a-b, 4
Locality: Sint Niklaas, Steendorp
Occurrence: Caligodinium endoreticulum occurs mainly in the lower part of the Boom Formation in the Belsele-Waas and Terhagen Members. A single specimen was found in the Putte Members at the 35.41 meter level.
Age: Rupelian
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Original description: [Stover and Hardenbol, 1994]:
Description:
Cysts proximate, ellipsoidal, longer than wide and with slight dorso-ventral flattening. Autophragm rarely folded, about 1.5 µm thick, externally smooth; a flocculent cloak may be present. Internally, the autophragm is finely reticulate to punctoreticulate with lumina that are about the same width or wider than the muri.
Paratabulation expressed by the apical archeopyle and its triplacoid operculum and by the very short sutures along the principal archeopyle margin. The accessory sutures indicate the presence of six precingular paraplates of which 6"" is narrow and only marginally wider than the parasulcal notch. Other indications of paratabulation absent.
Dimensions:
Size: intermediate
length of specimens with opercula in place 53 to 61 µm, specimens without opercula 41 to 47 µm, width 45 to 50 µm.
Remarks:
The opercular configuration of Caligodinium endoreticulum is identical to that described for C. pychnum Biffi and Manum 1988 and for specimens of C. amiculum Drugg 1970 found during this study. On most specimens of C. endoreticulum the opercular pieces are adherent and partly disarticulated. Accessory archeopyle sutures are displayed most advantageously on specimens without opercula.
Affinities:
Caligodinium endoreticulum differs from C. amiculum and C. pychnum by having a finely reticulate to punctoreticulate endoreticulation. The internal wall structure of C. pychnum appears to be pitted according to Biffi and Manum (1988). Caligodinium amiculum and C. endoreticulum are essentially smooth externally whereas C. pychnum has a retirugulate outer surface.
Holotype: Stover and Hardenbol, 1994, Plate 1, Figures 3a-b, 4
Locality: Sint Niklaas, Steendorp
Occurrence: Caligodinium endoreticulum occurs mainly in the lower part of the Boom Formation in the Belsele-Waas and Terhagen Members. A single specimen was found in the Putte Members at the 35.41 meter level.
Age: Rupelian
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Stover and Hardenbol, 1994]:
Description:
Cysts proximate, ellipsoidal, longer than wide and with slight dorso-ventral flattening. Autophragm rarely folded, about 1.5 µm thick, externally smooth; a flocculent cloak may be present. Internally, the autophragm is finely reticulate to punctoreticulate with lumina that are about the same width or wider than the muri.
Paratabulation expressed by the apical archeopyle and its triplacoid operculum and by the very short sutures along the principal archeopyle margin. The accessory sutures indicate the presence of six precingular paraplates of which 6"" is narrow and only marginally wider than the parasulcal notch. Other indications of paratabulation absent.
Dimensions:
Size: intermediate
length of specimens with opercula in place 53 to 61 µm, specimens without opercula 41 to 47 µm, width 45 to 50 µm.
Remarks:
The opercular configuration of Caligodinium endoreticulum is identical to that described for C. pychnum Biffi and Manum 1988 and for specimens of C. amiculum Drugg 1970 found during this study. On most specimens of C. endoreticulum the opercular pieces are adherent and partly disarticulated. Accessory archeopyle sutures are displayed most advantageously on specimens without opercula.
Affinities:
Caligodinium endoreticulum differs from C. amiculum and C. pychnum by having a finely reticulate to punctoreticulate endoreticulation. The internal wall structure of C. pychnum appears to be pitted according to Biffi and Manum (1988). Caligodinium amiculum and C. endoreticulum are essentially smooth externally whereas C. pychnum has a retirugulate outer surface.