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Netrelytron trinetron
Netrelytron "trinetrum" Sarjeant, 1966c, p.199–200, pl.22, fig.3; text-fig.51. Holotype: Sarjeant, 1966c, pl.22, fig.3. Originally Netrelytron, subsequently Kalyptea, thirdly Pareodinia. Taxonomic senior synonym: Netrelytron (as and now Kalyptea) stegastum, according to Poulsen (1996, p.61). Taxonomic junior synonym: Netrelytron par, according to Wiggins (1975, p.110) — however, Netrelytron parum is now a taxonomic junior synonym of Pareodinia ceratophora subsp. ceratophora. For etymology, see Pareodinia trinetra. Age: middle Barremian.
Original diagnosis: Sarjeant, 1966, p. 199-200
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 µm, breadth 53.5 µm, length of apical horn 18 µm, of antapical horn 5 µm; overall length of inner body 67.5 µm, breadth 38.5 µm. Range of dimensions; overall length of enclosing body ca.70-95 µm.
Original description: Sarjeant, 1966, p. 200
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.
Original diagnosis: Sarjeant, 1966, p. 199-200
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 µm, breadth 53.5 µm, length of apical horn 18 µm, of antapical horn 5 µm; overall length of inner body 67.5 µm, breadth 38.5 µm. Range of dimensions; overall length of enclosing body ca.70-95 µm.
Original description: Sarjeant, 1966, p. 200
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.