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Netrelytron
From Williams et al., 2017:
[Netrelytron, Sarjeant, 1961a, p. 113; Emendation: Sarjeant, 1966c, p. 113, 199
Type species: Netrelytron stegastum, Sarjeant, 1961a (pl.15, fig.15; text-fig.14)]
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Original description: [Sarjeant, 1961]:
Diagnosis:
Micro-organism formed of a spherical, ovoidal, or ellipsoidal central body enclosed in a spindle-shaped outer membrane.
Dimensions:
Holotype: overall length 125 µm, breadth 55 µm, long diameter of shell 55 µm, short diameter 45 µm.
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Emended description:
Sarjeant, 1966:
Diagnosis:
Cavate dinoflagellate cysts, enclosing body spindle-shaped, inner body ovoidal to spindle-shaped. Shell showing no trace of tabulation or of cingulum or sulcus. Shell enclosed in cloak of adherent organic matter, formless or oval to spindle-shaped in outline; fragments of mineral matter and other sedimentary debris sometimes embedded in cloak. Archaeopyle frequently developed: precingular in position.
Affinities:
Four existing genera posses a central body surrounded by an outer membrane. Netrelytron differs from Pterocystidiopsis Deflandre in the distinctive and well-defined shape of its outer membrane; from Deflandrea Eisenack, Scriniodinium Klement and Muderongia Cookson and Eisenack in that the outer membrane has only two opposed prominences (Scriniodinium lacks horns; Deflandrea has one extremity, a single horn, and the other, two horns; Muderongia has four equidistant horns) and from Deflandrea and Scriniodinium also in that the central body lacks a transverse furrow, these latter genera being undoubtedly encysted dinoflagellates.
[Netrelytron, Sarjeant, 1961a, p. 113; Emendation: Sarjeant, 1966c, p. 113, 199
Type species: Netrelytron stegastum, Sarjeant, 1961a (pl.15, fig.15; text-fig.14)]
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Sarjeant, 1961]:
Diagnosis:
Micro-organism formed of a spherical, ovoidal, or ellipsoidal central body enclosed in a spindle-shaped outer membrane.
Dimensions:
Holotype: overall length 125 µm, breadth 55 µm, long diameter of shell 55 µm, short diameter 45 µm.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Emended description:
Sarjeant, 1966:
Diagnosis:
Cavate dinoflagellate cysts, enclosing body spindle-shaped, inner body ovoidal to spindle-shaped. Shell showing no trace of tabulation or of cingulum or sulcus. Shell enclosed in cloak of adherent organic matter, formless or oval to spindle-shaped in outline; fragments of mineral matter and other sedimentary debris sometimes embedded in cloak. Archaeopyle frequently developed: precingular in position.
Affinities:
Four existing genera posses a central body surrounded by an outer membrane. Netrelytron differs from Pterocystidiopsis Deflandre in the distinctive and well-defined shape of its outer membrane; from Deflandrea Eisenack, Scriniodinium Klement and Muderongia Cookson and Eisenack in that the outer membrane has only two opposed prominences (Scriniodinium lacks horns; Deflandrea has one extremity, a single horn, and the other, two horns; Muderongia has four equidistant horns) and from Deflandrea and Scriniodinium also in that the central body lacks a transverse furrow, these latter genera being undoubtedly encysted dinoflagellates.