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Cauveridinium intermedium
Cauveridinium intermedium, Khowaja-Ateequzzaman and Jain, 1990
Holotype: Khowaja-Ateequzzaman and Jain, 1990, pl.2, figs.1-5; Text-fig. 2A-B
Locus typicus: Trichinopoly Formation, Kullakkanatham, Cauvery Basin,
Stratum typicum: Turonian-Santonian
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Original description: [Khowaja-Ateequzzaman and Jain, 1990, p.178]
Diagnosis:
Cyst skolochorate, lenticular, subcircular; apex obtusely angular; antapex with two reduced, unequal prominences, separated by a concavity; autophragm smooth, ornamented with processes; processes restricted to circumferential border zone, absent on central dorsal and central ventral areas, solid, branched, variable in length and breadth, proximally connected, a few distally fused; archaeopyle apical, type (4A), operculum free.
Description:
Shape: Cyst dorso-ventrally compressed, subcircular, sulcal notch offset to left of cyst (Textfig. 2B), apical margin obtusely angular; antapex with two reduced, unequal prominences separated by a concavity.
Wall relationship: Autophragm only.
Wall features: No parasutural features, autophragm smooth, ornamented with processes restricted to circumferential border zone, absent on central dorsal and central ventral areas; processes solid, branched, variable in size, mostly proximally connected through ridges; others single, unconnected; some distally fused (Text-fig. 2A).
Paratabulation: Indicated by archaeopyle alone.
Archaeopyle: Apical, type (4A), operculum free.
Dimensions: Holotype Range
Size of body 58 x 64 µm 55 75 x 52-64 µm (without operculum)
Length of processes 8-20 µm 6-22 µm
Affinities:
Cauveridinium intermedium is an interesting species having features of both Cyclonephelium distinctum Deflandre and Cookson 1955 and its own. The occurrence of simple and unconnected processes suggests comparison with C. distinctum but proximally connected adjacent processes through a ridge differentiate it from Cyclonephelium. The other two species, Cauveridinium indicum and C. longispinosum, differ from C. intermedium in that differentiated autophragm.
Holotype: Khowaja-Ateequzzaman and Jain, 1990, pl.2, figs.1-5; Text-fig. 2A-B
Locus typicus: Trichinopoly Formation, Kullakkanatham, Cauvery Basin,
Stratum typicum: Turonian-Santonian
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Khowaja-Ateequzzaman and Jain, 1990, p.178]
Diagnosis:
Cyst skolochorate, lenticular, subcircular; apex obtusely angular; antapex with two reduced, unequal prominences, separated by a concavity; autophragm smooth, ornamented with processes; processes restricted to circumferential border zone, absent on central dorsal and central ventral areas, solid, branched, variable in length and breadth, proximally connected, a few distally fused; archaeopyle apical, type (4A), operculum free.
Description:
Shape: Cyst dorso-ventrally compressed, subcircular, sulcal notch offset to left of cyst (Textfig. 2B), apical margin obtusely angular; antapex with two reduced, unequal prominences separated by a concavity.
Wall relationship: Autophragm only.
Wall features: No parasutural features, autophragm smooth, ornamented with processes restricted to circumferential border zone, absent on central dorsal and central ventral areas; processes solid, branched, variable in size, mostly proximally connected through ridges; others single, unconnected; some distally fused (Text-fig. 2A).
Paratabulation: Indicated by archaeopyle alone.
Archaeopyle: Apical, type (4A), operculum free.
Dimensions: Holotype Range
Size of body 58 x 64 µm 55 75 x 52-64 µm (without operculum)
Length of processes 8-20 µm 6-22 µm
Affinities:
Cauveridinium intermedium is an interesting species having features of both Cyclonephelium distinctum Deflandre and Cookson 1955 and its own. The occurrence of simple and unconnected processes suggests comparison with C. distinctum but proximally connected adjacent processes through a ridge differentiate it from Cyclonephelium. The other two species, Cauveridinium indicum and C. longispinosum, differ from C. intermedium in that differentiated autophragm.