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Cauveridinium longispinosum
Cauveridinium longispinosum, Khowaja-Ateequzzaman and Jain, 1990
Holotype: Khowaja-Ateequzzaman and Jain, 1990, pl.3, figs.1-4, text-fig.3
Locus typicus: Trichinopoly Formation, Kunnam, Cauvery Basin
Stratum typicum: Turonian-Santonian
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Original description: [Khowaja-Ateequzzaman and Jain, 1990, p.178-179]:
Diagnosis:
Cyst skolochorate, lenticular, subcircular, apex obtusely angular;
antapex with two unequal, reduced prominences separated by a concavity; autophragm differentiated, ornamented with processes; processes restricted to circumferential border zone, absent on central dorsal and central ventral areas, variable in size, adjacent processes connected proximally through ridge;
archaeopyle apical, type (4A), operculum free.
Description:
Shape: Cyst dorso-ventrally compressed, subcircular, sulcal notch offset to left of cyst, apical margin obtusely angular; antapex with two unequal prominences separated by a concavity.
Wall relationship: Autophragm only.
Wall features: No parasutural features; autophragm fibrous, spongy; fibre-like elements arise from process bases and ridges which merge with others, packing density of these elements increases inwardly, becoming quite continuous, homogeneous and less spongy toward centre; ornamented with processes, processes restricted to circumferential border zone, absent on central dorsal and central ventral areas, long, variable in length and breadth, constricted in middle but flared and fenestrate distally; adjacent processes of each side of cyst proximally connected through a ridge (Text-fig.3), larger in size on dorsal than ventral side.
Paratabulation: Indicated by archaeopyle alone.
Archaeopyle: Apical, type (4A), operculum free.
Dimensions: Holotype Range
Size of body 56 x 66 µm 55-68 x 60-70 µm (without operculum)
Length of processes 9-26 µm 8-35 µm
Affinities:
Cauveridinium longispinosum differs from C. intermedium sp. nov. in having differentiated autophragm and from C. indicum in that long, non membranous processes.
Holotype: Khowaja-Ateequzzaman and Jain, 1990, pl.3, figs.1-4, text-fig.3
Locus typicus: Trichinopoly Formation, Kunnam, Cauvery Basin
Stratum typicum: Turonian-Santonian
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Khowaja-Ateequzzaman and Jain, 1990, p.178-179]:
Diagnosis:
Cyst skolochorate, lenticular, subcircular, apex obtusely angular;
antapex with two unequal, reduced prominences separated by a concavity; autophragm differentiated, ornamented with processes; processes restricted to circumferential border zone, absent on central dorsal and central ventral areas, variable in size, adjacent processes connected proximally through ridge;
archaeopyle apical, type (4A), operculum free.
Description:
Shape: Cyst dorso-ventrally compressed, subcircular, sulcal notch offset to left of cyst, apical margin obtusely angular; antapex with two unequal prominences separated by a concavity.
Wall relationship: Autophragm only.
Wall features: No parasutural features; autophragm fibrous, spongy; fibre-like elements arise from process bases and ridges which merge with others, packing density of these elements increases inwardly, becoming quite continuous, homogeneous and less spongy toward centre; ornamented with processes, processes restricted to circumferential border zone, absent on central dorsal and central ventral areas, long, variable in length and breadth, constricted in middle but flared and fenestrate distally; adjacent processes of each side of cyst proximally connected through a ridge (Text-fig.3), larger in size on dorsal than ventral side.
Paratabulation: Indicated by archaeopyle alone.
Archaeopyle: Apical, type (4A), operculum free.
Dimensions: Holotype Range
Size of body 56 x 66 µm 55-68 x 60-70 µm (without operculum)
Length of processes 9-26 µm 8-35 µm
Affinities:
Cauveridinium longispinosum differs from C. intermedium sp. nov. in having differentiated autophragm and from C. indicum in that long, non membranous processes.