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Catastomocystis microreticulata
Catastomocystis microreticulata, Singh, 1983
Holotype: Singh, 1983, pl.56, fig.4
Locus typicus: Peace River area, NW Alberta, Canada
Stratum typicum: Early Cenomanian
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Original description: [Singh, 1983, p. 153]:
Description:
Proximate, camocavate cysts with a subpentagonal to ellipsoidal, longitudinally elongated outline; apex blunt, slightly angular to rounded; antapex truncated, with straight to slightly convex margin;
pericyst with a 23-37 µm wide, oval, antapical pericoelar opening (opisthopyle) occupying the entire antapical end; endocyst ellipsoidal to spherical;
periphragm and endophragm dorsally appressed and widely separated elsewhere;
endocyst dark, with microreticulate ornamentation; lumina 0.5 µm wide, often confluent;
pericyst membranous and granular;
paratabulation gonyaulacacean, typical for the genus, incompletely expressed by discontinuous, low, parasutural crests or folds; paracingulum 5 to 7 microns wide, delineated by low, parallel, transverse, equatorial ridges, and subdivided into rectangular paraplates;
archeopyle precingular, type P (3" only); operculum free.
Dimensions:
Size range: Length of the pericyst 47(54)60 µm. Holotype 60 µm. Breadth of the pericyst 41(45)51 µm. Holotype 47 µm. Length of the endocyst 37(41)45 µm. Holotype 45 µm. Breadth of the endocyst 35(38)41 µm. Holotype 36 µm. Specimens measured 4.
Affinities:
Catastomocystis microreticulata differs from Catastomocystis spinosa in having an endocyst with microreticulate ornamentation and in the absence of the gonal spines, which have completely atrophied in this species.
Holotype: Singh, 1983, pl.56, fig.4
Locus typicus: Peace River area, NW Alberta, Canada
Stratum typicum: Early Cenomanian
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Singh, 1983, p. 153]:
Description:
Proximate, camocavate cysts with a subpentagonal to ellipsoidal, longitudinally elongated outline; apex blunt, slightly angular to rounded; antapex truncated, with straight to slightly convex margin;
pericyst with a 23-37 µm wide, oval, antapical pericoelar opening (opisthopyle) occupying the entire antapical end; endocyst ellipsoidal to spherical;
periphragm and endophragm dorsally appressed and widely separated elsewhere;
endocyst dark, with microreticulate ornamentation; lumina 0.5 µm wide, often confluent;
pericyst membranous and granular;
paratabulation gonyaulacacean, typical for the genus, incompletely expressed by discontinuous, low, parasutural crests or folds; paracingulum 5 to 7 microns wide, delineated by low, parallel, transverse, equatorial ridges, and subdivided into rectangular paraplates;
archeopyle precingular, type P (3" only); operculum free.
Dimensions:
Size range: Length of the pericyst 47(54)60 µm. Holotype 60 µm. Breadth of the pericyst 41(45)51 µm. Holotype 47 µm. Length of the endocyst 37(41)45 µm. Holotype 45 µm. Breadth of the endocyst 35(38)41 µm. Holotype 36 µm. Specimens measured 4.
Affinities:
Catastomocystis microreticulata differs from Catastomocystis spinosa in having an endocyst with microreticulate ornamentation and in the absence of the gonal spines, which have completely atrophied in this species.