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Xenascus serpaglii
From Fensome et al., 2019:
Xenascus serpaglii (Corradini, 1973) Stover and Evitt, 1978
Originally Phoberocysta, subsequently (and now) Xenascus.
Holotype: Corradini, 1973, pl.29, figs.7a-b
Paratype: Corradini, 1973
Locus typicus: Viano, Reggio Emilia, Italy
Stratum typicum: Senonian
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Original diagnosis: Corradini, 1973, p. 181-182: Phoberocysta serpaglii
Dinoflagellate cyst, roughly triangular in outline with subspherical inner body, smooth endophragm and periphragm. Pericoel extending from the conical, antapical horn to a lateral wide wing. Well developed processes, heterogenous in shape. Quadrangular apical archeopyle.
Dimensions--Holotype: width of capsule 50 µm, length (without operculum) 52 µm, width of the periphragm 76 µm, length 76 µm. Range: width of capsule 50-(56)-64 µm, length (without operculum) 48-(57)-60 µm, width of periphragm 60-(82)-90 µm, length 70-(82)-110 µm.
Original description: Corradini, 1973, p. 182: Phoberocysta serpaglii
The test possesses a moderately thick endophragm (1 µm) and a thinner periphragm. The two walls are closely appressed, except at the antapical horn and at a lateral wing. The processes are not numerous but irregularly arranged on the central body. They are normally solid, simple or branched, distally bifurcated. Adjacent processes may be connected by proximal crcsts. A lateral wing, from the margins of which well developed processes arise, is always present. The conical antapical horn often shows numerous simple, slender appendages resulting in a digitate appearance. Cingulum absent.
Archeopyle roughly quadrangular, apical in position, bordered by 4 processes, probably precingular.
Affinities:
Corradini, 1973, p. 182: Phoberocysta serpaglii
No trace of tabulation is present on the central body. However, the shape of archeopyle and the position of the processes around it suggests a plate pattern, like that observed in Phoberocysta sarjeanti. Phoberocysta serpaglii is easily recognizable by the typical triangular outline of the periphragm.
Xenascus serpaglii (Corradini, 1973) Stover and Evitt, 1978
Originally Phoberocysta, subsequently (and now) Xenascus.
Holotype: Corradini, 1973, pl.29, figs.7a-b
Paratype: Corradini, 1973
Locus typicus: Viano, Reggio Emilia, Italy
Stratum typicum: Senonian
----------------------------------------------------------------------------------------------------------------------------------
Original diagnosis: Corradini, 1973, p. 181-182: Phoberocysta serpaglii
Dinoflagellate cyst, roughly triangular in outline with subspherical inner body, smooth endophragm and periphragm. Pericoel extending from the conical, antapical horn to a lateral wide wing. Well developed processes, heterogenous in shape. Quadrangular apical archeopyle.
Dimensions--Holotype: width of capsule 50 µm, length (without operculum) 52 µm, width of the periphragm 76 µm, length 76 µm. Range: width of capsule 50-(56)-64 µm, length (without operculum) 48-(57)-60 µm, width of periphragm 60-(82)-90 µm, length 70-(82)-110 µm.
Original description: Corradini, 1973, p. 182: Phoberocysta serpaglii
The test possesses a moderately thick endophragm (1 µm) and a thinner periphragm. The two walls are closely appressed, except at the antapical horn and at a lateral wing. The processes are not numerous but irregularly arranged on the central body. They are normally solid, simple or branched, distally bifurcated. Adjacent processes may be connected by proximal crcsts. A lateral wing, from the margins of which well developed processes arise, is always present. The conical antapical horn often shows numerous simple, slender appendages resulting in a digitate appearance. Cingulum absent.
Archeopyle roughly quadrangular, apical in position, bordered by 4 processes, probably precingular.
Affinities:
Corradini, 1973, p. 182: Phoberocysta serpaglii
No trace of tabulation is present on the central body. However, the shape of archeopyle and the position of the processes around it suggests a plate pattern, like that observed in Phoberocysta sarjeanti. Phoberocysta serpaglii is easily recognizable by the typical triangular outline of the periphragm.