Back
Carpathodinium sp. a of feist-burkhardt 1990
Carpathodinium sp. A of Feist-Burkhardt 1990, Feist-Burkhardt 1990
Figured: Feist-Burkhardt 1990, Pl. 4, fig. 1; text-fig. 4
Occurrence: rare (1 - 3 specimens per slide) but seems to be indicative for the latest Aalenian and Early Bajocian; Upper Braunjura b" to Lower Braun-jura gamma (Late Aalenian, concavum Zone, to early Bajocian, laeviuscula Zone) in this study.
Previously reported occurrences: southeast Germany: Buchberg 3 well, 87 m (Aalenian) - LUND & ECKE (1988); Northern Switzerland: Weiach corehole, Humphrisie and Sowerbyi Schichten (Early Bajocian), Transjurane corehole, Blaukalk (Bajocian) - personal observation (unpublished); Eastern France: southern Jura Mountains, Marnes Bleues (Late Aalenian) - personal observation (unpublished).
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Feist-Burkhardt 1990, p. 615]:
Diagnosis:
cyst proximate, subspherical, with a small apical horn. Autophragm thin, psilate. Parasutures marked by smooth low ridges.
Archeopyle seems to be formed by loss of several anterior intercalary paraplates.
Paratabulation clearly expressed by parasutural ridges except for apical and dorsal anterior parts of the cyst. Paratabulation formula: ?pr, X", Xa, 6"", 6c, 6""", 1 p, 1"""", 2-Xs (Fig. 4).
Paracingulum indicated by six subrectangular elongate paraplates. Parasulcus indicated by bordering parasutural ridges, subdivision, except ps, not determined.
Dimensions:
length inclusive apical horn: 36 (37,5) 40 µm, width 32 (36) 38 µm (5 specimens measured).
Remarks:
Carpathodinium sp. A shows a conspicuous alteration of the cyst wall in the apical and dorsal anterior part of the cyst. The normally psilate cyst wall appears thinned or disintegrated, so that the otherwise well indicated paratabulation is no more discernible (Pl. 3, fig. 1; Fig. 4). This cyst wall alteration, observed in all studied specimens, may be interpreted as being linked to the archeopyle formation. It seems that during the archeopyle formation several intercalary paraplates (number ?) are dissolved by etching. Because of the present uncertainties over epicystal paratabulation and its archeopyle type the species is left in open nomenclature until more specimens can be studied.
Affinities:
Carpathodinium sp. A differs from Carpathodinium predae (BEJU 1971 ) DRUGG 1978 in having a nearly spherical, rather than an elongate ovoidal outline.
Figured: Feist-Burkhardt 1990, Pl. 4, fig. 1; text-fig. 4
Occurrence: rare (1 - 3 specimens per slide) but seems to be indicative for the latest Aalenian and Early Bajocian; Upper Braunjura b" to Lower Braun-jura gamma (Late Aalenian, concavum Zone, to early Bajocian, laeviuscula Zone) in this study.
Previously reported occurrences: southeast Germany: Buchberg 3 well, 87 m (Aalenian) - LUND & ECKE (1988); Northern Switzerland: Weiach corehole, Humphrisie and Sowerbyi Schichten (Early Bajocian), Transjurane corehole, Blaukalk (Bajocian) - personal observation (unpublished); Eastern France: southern Jura Mountains, Marnes Bleues (Late Aalenian) - personal observation (unpublished).
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Feist-Burkhardt 1990, p. 615]:
Diagnosis:
cyst proximate, subspherical, with a small apical horn. Autophragm thin, psilate. Parasutures marked by smooth low ridges.
Archeopyle seems to be formed by loss of several anterior intercalary paraplates.
Paratabulation clearly expressed by parasutural ridges except for apical and dorsal anterior parts of the cyst. Paratabulation formula: ?pr, X", Xa, 6"", 6c, 6""", 1 p, 1"""", 2-Xs (Fig. 4).
Paracingulum indicated by six subrectangular elongate paraplates. Parasulcus indicated by bordering parasutural ridges, subdivision, except ps, not determined.
Dimensions:
length inclusive apical horn: 36 (37,5) 40 µm, width 32 (36) 38 µm (5 specimens measured).
Remarks:
Carpathodinium sp. A shows a conspicuous alteration of the cyst wall in the apical and dorsal anterior part of the cyst. The normally psilate cyst wall appears thinned or disintegrated, so that the otherwise well indicated paratabulation is no more discernible (Pl. 3, fig. 1; Fig. 4). This cyst wall alteration, observed in all studied specimens, may be interpreted as being linked to the archeopyle formation. It seems that during the archeopyle formation several intercalary paraplates (number ?) are dissolved by etching. Because of the present uncertainties over epicystal paratabulation and its archeopyle type the species is left in open nomenclature until more specimens can be studied.
Affinities:
Carpathodinium sp. A differs from Carpathodinium predae (BEJU 1971 ) DRUGG 1978 in having a nearly spherical, rather than an elongate ovoidal outline.