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Pseudoceratium turneri
Pseudoceratium turneri Cookson and Eisenack, 1958
Now Endoceratium. Originally Pseudoceratium, subsequently (and now) Endoceratium. Helby 1987 retained this species in Pseudoceratium; however, Lentin and Williams, 1989 retained it in Endoceratium Vozzhennikova, 1965.
Holotype: Cookson and Eisenack, 1958, pl.5, fig.3
Paratypes: Cookson and Eisenack, 1958
Locus typicus: Gearle Siltstone, Carnarvon Basin, W-Australia
Stratum typicum: Aptian-Albian
Original description: Cookson and Eisenack, 1958
Test either subtriangular with an oblique base and convex sides, prolonged into three horns of unequal length, a longer apical horn and two widely separated divergent antapical horns, or with a rounded base and one antapical horn. Frequently the apical of the body becomes detached near the base of the apical horn.
The ornament usually takes the form of narrow lamella-like membranes with irregular, frequently curved outlines of variable lengths fomed by the distal coalescence of short bifurcate processes, the lamellae either remaining free or uniting to form a more or less complete network.
Dimensions: Type - 180 µm x 100 µm overall; apical horn 55 µm.
Supplemental description: Morgan, 1980, p. 31
Single-layered cyst usually subtriangular with convex sides, to subrhombic; autophragm usually drawn into one apical and one antapical subconical horn, with a broadly rounded bulge forming the single lateral horn, arising at the cingulum and pointed antapically; occasionally the second antapical horn, and the second lateral horn are marked by broad bulges, creating a roughly pentagonal cyst body.
Fibrous processes arise from the autophragm, may unite distally to form perforate striate crests, may untie along their whole length to form striate fibrous crests, and may support a complete or incomplete distal ectophragm, usually perforate; proximally the aligned process bases may be parasutural, defining a gonyaulacean tabulation, or may be non-tabular; distally, the supported ectophragm may be discontinuous, resticted to intertabular areas, and absent along the parasutures; fibrous ornament very variable in hight, 5-12 µm over most of the crest surface, but longer at the horns.
Archaeopyle apical, operculum free.
Now Endoceratium. Originally Pseudoceratium, subsequently (and now) Endoceratium. Helby 1987 retained this species in Pseudoceratium; however, Lentin and Williams, 1989 retained it in Endoceratium Vozzhennikova, 1965.
Holotype: Cookson and Eisenack, 1958, pl.5, fig.3
Paratypes: Cookson and Eisenack, 1958
Locus typicus: Gearle Siltstone, Carnarvon Basin, W-Australia
Stratum typicum: Aptian-Albian
Original description: Cookson and Eisenack, 1958
Test either subtriangular with an oblique base and convex sides, prolonged into three horns of unequal length, a longer apical horn and two widely separated divergent antapical horns, or with a rounded base and one antapical horn. Frequently the apical of the body becomes detached near the base of the apical horn.
The ornament usually takes the form of narrow lamella-like membranes with irregular, frequently curved outlines of variable lengths fomed by the distal coalescence of short bifurcate processes, the lamellae either remaining free or uniting to form a more or less complete network.
Dimensions: Type - 180 µm x 100 µm overall; apical horn 55 µm.
Supplemental description: Morgan, 1980, p. 31
Single-layered cyst usually subtriangular with convex sides, to subrhombic; autophragm usually drawn into one apical and one antapical subconical horn, with a broadly rounded bulge forming the single lateral horn, arising at the cingulum and pointed antapically; occasionally the second antapical horn, and the second lateral horn are marked by broad bulges, creating a roughly pentagonal cyst body.
Fibrous processes arise from the autophragm, may unite distally to form perforate striate crests, may untie along their whole length to form striate fibrous crests, and may support a complete or incomplete distal ectophragm, usually perforate; proximally the aligned process bases may be parasutural, defining a gonyaulacean tabulation, or may be non-tabular; distally, the supported ectophragm may be discontinuous, resticted to intertabular areas, and absent along the parasutures; fibrous ornament very variable in hight, 5-12 µm over most of the crest surface, but longer at the horns.
Archaeopyle apical, operculum free.