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Kalyptea trinetra
Kalyptea trinetron (Sarjeant, 1966) Wiggins, 1975
Now Pareodinia. Originally Netrelytron, subsequently Kalyptea, thirdly (and now) Pareodinia.
Taxonomic senior synonym: Netrelytron (as Kalyptea) stegastum, according to Poulsen (1996, p.61).
Taxonomic junior synonym: Netrelytron par, according to Wiggins (1975, p.110).
For etymology, see under Pareodinia trinetra.
Holotype: Sarjeant, 1966, pl.22, fig.3
Locus typicus: W Heslerton, England
Stratum typicum: Middle Barremian
Original diagnosis: Sarjeant, 1966, p. 199-200: Netrelytron trinetron
A Netrelytron with outer body of basically ovoidal shape, giving rise to strongly tapering, conical apical horn and somewhat shorter, conical antapical horn. Shape of inner body exactly similar. Horns polar and axial in position and direction. Endophragm and periphragm minutely, but densely, granular. antapical horn represented by slight protuberance on left antapical margin. Capsule thick walled, often coarsely granular. Processes extremely short on ambitus of periphragm and increasing in length further away from ambitus. Distally processes bifid, aculeate, acuminate or evexate.
Dimensions: hlotype--overall length of enclosing body 90 Ám, breadth 53.5 Ám, length of apical horn 18 Ám, of antapical horn 5 Ám; overall length of inner body 67.5 Ám, breadth 38.5 Ám. Range of dimensions; overall length of enclosing body ca.70-95 Ám.
Original description: Sarjeant, 1966, p. 200: Netrelytron trinetron
The holotype is enclosed in a spindle-shaped cloak of debris: in other specimens, the debris cloak appears less well formed.
The outer membrane is spindle-shaped, with unequally developed horns. In the holotype, the apical horn tapers sharply to an acute point from about mid-length: this was not the case in other specimens, where the apical horn tapered more smoothly from base to tip. The inner body is of comparable shape, its apical horn always tapering smoothly from base to tip.
No specimen seen shows a well-developed archaeopyle; however, the holotype shows a slit, corresponding in position to a precingular opening, which may be an archaeopyle that has either incompletely opened or subsequently closed up.
Now Pareodinia. Originally Netrelytron, subsequently Kalyptea, thirdly (and now) Pareodinia.
Taxonomic senior synonym: Netrelytron (as Kalyptea) stegastum, according to Poulsen (1996, p.61).
Taxonomic junior synonym: Netrelytron par, according to Wiggins (1975, p.110).
For etymology, see under Pareodinia trinetra.
Holotype: Sarjeant, 1966, pl.22, fig.3
Locus typicus: W Heslerton, England
Stratum typicum: Middle Barremian
Original diagnosis: Sarjeant, 1966, p. 199-200: Netrelytron trinetron
A Netrelytron with outer body of basically ovoidal shape, giving rise to strongly tapering, conical apical horn and somewhat shorter, conical antapical horn. Shape of inner body exactly similar. Horns polar and axial in position and direction. Endophragm and periphragm minutely, but densely, granular. antapical horn represented by slight protuberance on left antapical margin. Capsule thick walled, often coarsely granular. Processes extremely short on ambitus of periphragm and increasing in length further away from ambitus. Distally processes bifid, aculeate, acuminate or evexate.
Dimensions: hlotype--overall length of enclosing body 90 Ám, breadth 53.5 Ám, length of apical horn 18 Ám, of antapical horn 5 Ám; overall length of inner body 67.5 Ám, breadth 38.5 Ám. Range of dimensions; overall length of enclosing body ca.70-95 Ám.
Original description: Sarjeant, 1966, p. 200: Netrelytron trinetron
The holotype is enclosed in a spindle-shaped cloak of debris: in other specimens, the debris cloak appears less well formed.
The outer membrane is spindle-shaped, with unequally developed horns. In the holotype, the apical horn tapers sharply to an acute point from about mid-length: this was not the case in other specimens, where the apical horn tapered more smoothly from base to tip. The inner body is of comparable shape, its apical horn always tapering smoothly from base to tip.
No specimen seen shows a well-developed archaeopyle; however, the holotype shows a slit, corresponding in position to a precingular opening, which may be an archaeopyle that has either incompletely opened or subsequently closed up.