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Cauveridinium indicum
Cauveridinium indicum, Khowaja-Ateequzzaman and Jain, 1990
Holotype: Khowaja-Ateequzzaman and Jain, 1990, pl.1, figs.1-5, text-figd.1A-D
Locus typicus: Trichinopoly Formation, Kunnam, Cauvery Basin
Stratum typicum: Turonian-Santonian
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Original description: [Khowaja-Ateequzzaman and Jain, 1990, p.174, 176]:
Diagnosis:
Cyst skolochorate, lenticular, subcircular; apex obtusely angular; antapex with two unequal prominences separated by a concavity;
autophragm differentiated (sensu Evitt, 1985);
processes restricted to circumferential border zone, absent on central dorsal and central ventral areas, short, broad, membranous, fenestrate, supported by vertical fibres; processes proximally connected through thick ridges and a few mostly on dorsal surface also laterally connected through septa;
archaeopyle apical, type (4A), operculum simple, polyplacoid, free;
apical processes four, one per paraplate, proximally connected to a triangular structure formed at pre-apical paraplate position through ridges.
Description:
Shape: Cyst dorso-ventrally compressed, subcircular, sulcal notch offset to left of cyst (Textfig.1B,C); apical margin obtusely angular, antapex with two unequal prominences separated by a concavity.
Wall relationship: Autophragm only.
Wall features: No parasutural features; 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 towards center (Text-fig.1A); ornamented with processes; processes restricted to circumferential border zone, covering more areas on ventral than dorsal side (Text-fig.1C), central dorsal and central ventral areas free of processes; processes short, broad, men1branous, fenestrate, distal margins irregular, serrate, supported by vertical fibres, adjacent processes on each side proximally connected through a ridge, some laterally connected through septa (Text-fig.1A); apical processes proximally connected through ridges to a triangular structure at pre-apical paraplate position in a definite pattern, processes of 2" and 3" directly connect but of 1" and 4" first join together and then connect through a common ridge (Text-fig. lD).
Paratabulation: Indicated by archaeopyle alone.
Archaeopyle: Apical, type (4A), operculum simple, polyplacoid, free (Text-fig.1D).
Dimensions: Holotype Range
Size of body 70 x 80 µm 70-80 x 65-82 µm
Length of processes 6-12 µm 6-20 µm
Remarks:
The details of apical processes and operculum type mentioned for C. indicum are based on two well preserved dispersed specimens which possess identical differentiated autophragm and process type characteristic of the cyst.
Holotype: Khowaja-Ateequzzaman and Jain, 1990, pl.1, figs.1-5, text-figd.1A-D
Locus typicus: Trichinopoly Formation, Kunnam, Cauvery Basin
Stratum typicum: Turonian-Santonian
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Khowaja-Ateequzzaman and Jain, 1990, p.174, 176]:
Diagnosis:
Cyst skolochorate, lenticular, subcircular; apex obtusely angular; antapex with two unequal prominences separated by a concavity;
autophragm differentiated (sensu Evitt, 1985);
processes restricted to circumferential border zone, absent on central dorsal and central ventral areas, short, broad, membranous, fenestrate, supported by vertical fibres; processes proximally connected through thick ridges and a few mostly on dorsal surface also laterally connected through septa;
archaeopyle apical, type (4A), operculum simple, polyplacoid, free;
apical processes four, one per paraplate, proximally connected to a triangular structure formed at pre-apical paraplate position through ridges.
Description:
Shape: Cyst dorso-ventrally compressed, subcircular, sulcal notch offset to left of cyst (Textfig.1B,C); apical margin obtusely angular, antapex with two unequal prominences separated by a concavity.
Wall relationship: Autophragm only.
Wall features: No parasutural features; 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 towards center (Text-fig.1A); ornamented with processes; processes restricted to circumferential border zone, covering more areas on ventral than dorsal side (Text-fig.1C), central dorsal and central ventral areas free of processes; processes short, broad, men1branous, fenestrate, distal margins irregular, serrate, supported by vertical fibres, adjacent processes on each side proximally connected through a ridge, some laterally connected through septa (Text-fig.1A); apical processes proximally connected through ridges to a triangular structure at pre-apical paraplate position in a definite pattern, processes of 2" and 3" directly connect but of 1" and 4" first join together and then connect through a common ridge (Text-fig. lD).
Paratabulation: Indicated by archaeopyle alone.
Archaeopyle: Apical, type (4A), operculum simple, polyplacoid, free (Text-fig.1D).
Dimensions: Holotype Range
Size of body 70 x 80 µm 70-80 x 65-82 µm
Length of processes 6-12 µm 6-20 µm
Remarks:
The details of apical processes and operculum type mentioned for C. indicum are based on two well preserved dispersed specimens which possess identical differentiated autophragm and process type characteristic of the cyst.