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Carpodinium obliquicostatum
Carpodinium obliquicostatum, Cookson and Hughes, 1964
Holotype: Cookson and Hughes, 1964, pl. 6, fig.1; Jan du Chene et al., 1986, pl.16, figs.10-12
Locus typicus: Cambridgeshire, England
Stratum typicum: Late Albian-Early Cenomanian
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Original description: [Cookson and Hughes, 1964, p.48]:
Diagnosis:
Shell elongate-oval, divided almost equally by a circular girdle evident as lateral indentations 2-3 µm deep. Epitheca with a short tapering horn which arises from the outer membrane. Plates elongate, bordered by relatively high sutures with serrate edges; indications of an antapical plate have been seen and a large quadrangular pylome (pre-cingular archaeopyle) and longitudinal furrow are clearly evident in one specimen (Pl. 6 figs. 4, 5). The surface pattern of the plates provides the most distinctive specific feature; it consists of roughly triangular areas of variable size and shape which lie more or less obliquely to the long axis of the shell and are delimited by narrow anastomosing grooves.
Dimensions:
Holotype 73 µm long, 50 µm broad. Range 59-80 µm long, 36-50 µm broad.
Affinities: (p. 49):
The general form and size of C. obliquicostaum is similar to that of the type species C. granulatum Cooks. and Eisenack 1962 from Australian Aptian and Albian deposits, but the two species are readily distinguishable by their surface patterns. C. granulatum has not, as yet, been recovered from Cenomanian deposits.
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Supplemental description:
Davey, 1969, p. 129:
Description:
The shell is elongate-ovoidal and bears relatively high sutural crests. The latter are smooth or slightly granular and the distal margin may be entire or spinous. The short apical horn is a prolongation of one of the larger crests and is typically asymmetrically placed. The periphragm of the shell possesses an unusual ornamentation-small areas of triangular to polygonal shape, composed of thick periphragm, are separated by narrow anastomosing " canals " where the periphragm is unthickened or perhaps absent.
The cingulum is marked by indentations in some of the crests and is not apparent on the shell surface. The sulcus, delimited by crests, is occasionally observable and extends the length of the shell, being narrow near the apex and widening posteriorly. The precingular and postcingular plates, probably six in each series, are very elongate and difficult to discern because of the obscuring nature of the high
crests. A precingular archaeopyle is commonly present. Four apical plates and a single antapical plate appear to be present. Intercalary plates were not observed.
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Notes:
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Carpodinium obliquicostatum Cookson and Hughes, 1964. According to Cookson and Hughes (1964), has a short tapering apical horn. Plates elongate, bordered by high sutures with serrate edges. Surface pattern consists of roughly triangular areas of variable size and shape which lie more or less obliquely to the long axis of the shell and are delimited by narrow anastomosing grooves.
Size: length 59-80 µm, width 36-50 µm.
Holotype: Cookson and Hughes, 1964, pl. 6, fig.1; Jan du Chene et al., 1986, pl.16, figs.10-12
Locus typicus: Cambridgeshire, England
Stratum typicum: Late Albian-Early Cenomanian
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Cookson and Hughes, 1964, p.48]:
Diagnosis:
Shell elongate-oval, divided almost equally by a circular girdle evident as lateral indentations 2-3 µm deep. Epitheca with a short tapering horn which arises from the outer membrane. Plates elongate, bordered by relatively high sutures with serrate edges; indications of an antapical plate have been seen and a large quadrangular pylome (pre-cingular archaeopyle) and longitudinal furrow are clearly evident in one specimen (Pl. 6 figs. 4, 5). The surface pattern of the plates provides the most distinctive specific feature; it consists of roughly triangular areas of variable size and shape which lie more or less obliquely to the long axis of the shell and are delimited by narrow anastomosing grooves.
Dimensions:
Holotype 73 µm long, 50 µm broad. Range 59-80 µm long, 36-50 µm broad.
Affinities: (p. 49):
The general form and size of C. obliquicostaum is similar to that of the type species C. granulatum Cooks. and Eisenack 1962 from Australian Aptian and Albian deposits, but the two species are readily distinguishable by their surface patterns. C. granulatum has not, as yet, been recovered from Cenomanian deposits.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Supplemental description:
Davey, 1969, p. 129:
Description:
The shell is elongate-ovoidal and bears relatively high sutural crests. The latter are smooth or slightly granular and the distal margin may be entire or spinous. The short apical horn is a prolongation of one of the larger crests and is typically asymmetrically placed. The periphragm of the shell possesses an unusual ornamentation-small areas of triangular to polygonal shape, composed of thick periphragm, are separated by narrow anastomosing " canals " where the periphragm is unthickened or perhaps absent.
The cingulum is marked by indentations in some of the crests and is not apparent on the shell surface. The sulcus, delimited by crests, is occasionally observable and extends the length of the shell, being narrow near the apex and widening posteriorly. The precingular and postcingular plates, probably six in each series, are very elongate and difficult to discern because of the obscuring nature of the high
crests. A precingular archaeopyle is commonly present. Four apical plates and a single antapical plate appear to be present. Intercalary plates were not observed.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Notes:
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Carpodinium obliquicostatum Cookson and Hughes, 1964. According to Cookson and Hughes (1964), has a short tapering apical horn. Plates elongate, bordered by high sutures with serrate edges. Surface pattern consists of roughly triangular areas of variable size and shape which lie more or less obliquely to the long axis of the shell and are delimited by narrow anastomosing grooves.
Size: length 59-80 µm, width 36-50 µm.