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Erymnodinium modestum
From Fensome et al., 2019:
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Original description Morgenroth et al., 2008
Derivation of name: Latin, modestus, simple, with reference to the simple, unstructured pcriblast.
Holotypc: Pl. 8, Figs 5, 6. Sample CP-25, single grain slide CP-25/53.
Paratypes: Single grain slides CP-25/19, CP-25/58, CP-25/72 and CP-25/75, sample CP-25.
Type locality: Cipamingkis River, West Java (fext-fig. 2). Cisubuh Formation, Late Miocene, Age N 17.
Diagnosis: Cysts with a smooth endoblast, peridinoid in outline. The sides of the hypocyst are straight to slightly convex. Apex rounded. Sides of the hypocyst straight to slightly convex, ending in two antapical rounded protrusions. Periblast thin, smooth, sometimes wrinkled, enveloping the endoblast at a short distance. Cingulum circular, formed by two folds in the periblast. Archeopyle dorsal, large, precingular (P) or, possibly, intercalary (I).
Description: The cysts consist of an endoblast and periblast, are peridinoid in outline and compressed dorsoventrally. Epicyst about equal to hypocyst, with straight to convex sides and a rounded apex. Hypocyst with straight to concave sides and with two rounded antapical lobes and a prominent antapical depression. The surface of the endoblast is smooth. The endoblast is surrounded at a distance of some 5-10 μm by the periblast. The periblast consists of a thin smooth membrane which may be wrinkled (?preservation). A circular cingulum is well defined by two parallel folds, up to 10 μm high, in the periblast. On the ventral side the cingulum may be continuous or interrupted by the unornamented parasulcus. The archeopyle is large, located on the dorsal side of the epicyst and most probably precingular (P).
Dimensions: Length of cyst 55 (67) 78 μm, holotype 55 μm, width of cyst 60 (70) 80 μm, holotype 70 μm. Pericoel: 5-10 μm. 5 specimens measured.
Comparison: The new species can be differentiated from Erymnodinium delectabi/e (DE VERTEUIL and NORRIS) LENTIN et al. 1994 by its smaller dimensions and different endoblast (DE VERTEUIL & NORRIS 1996: Part I, p. 35, pl. 4, fig. 4).
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Original description Morgenroth et al., 2008
Derivation of name: Latin, modestus, simple, with reference to the simple, unstructured pcriblast.
Holotypc: Pl. 8, Figs 5, 6. Sample CP-25, single grain slide CP-25/53.
Paratypes: Single grain slides CP-25/19, CP-25/58, CP-25/72 and CP-25/75, sample CP-25.
Type locality: Cipamingkis River, West Java (fext-fig. 2). Cisubuh Formation, Late Miocene, Age N 17.
Diagnosis: Cysts with a smooth endoblast, peridinoid in outline. The sides of the hypocyst are straight to slightly convex. Apex rounded. Sides of the hypocyst straight to slightly convex, ending in two antapical rounded protrusions. Periblast thin, smooth, sometimes wrinkled, enveloping the endoblast at a short distance. Cingulum circular, formed by two folds in the periblast. Archeopyle dorsal, large, precingular (P) or, possibly, intercalary (I).
Description: The cysts consist of an endoblast and periblast, are peridinoid in outline and compressed dorsoventrally. Epicyst about equal to hypocyst, with straight to convex sides and a rounded apex. Hypocyst with straight to concave sides and with two rounded antapical lobes and a prominent antapical depression. The surface of the endoblast is smooth. The endoblast is surrounded at a distance of some 5-10 μm by the periblast. The periblast consists of a thin smooth membrane which may be wrinkled (?preservation). A circular cingulum is well defined by two parallel folds, up to 10 μm high, in the periblast. On the ventral side the cingulum may be continuous or interrupted by the unornamented parasulcus. The archeopyle is large, located on the dorsal side of the epicyst and most probably precingular (P).
Dimensions: Length of cyst 55 (67) 78 μm, holotype 55 μm, width of cyst 60 (70) 80 μm, holotype 70 μm. Pericoel: 5-10 μm. 5 specimens measured.
Comparison: The new species can be differentiated from Erymnodinium delectabi/e (DE VERTEUIL and NORRIS) LENTIN et al. 1994 by its smaller dimensions and different endoblast (DE VERTEUIL & NORRIS 1996: Part I, p. 35, pl. 4, fig. 4).