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Senoniasphaera reticulata
From Fensome et al., 2019:
Senoniasphaera? reticulata (Khanna and Singh, 1981b, p.391, fig.1, nos.4,6; text-fig.3) Lentin and Williams, 1993, p.591. Holotype: Khanna and Singh, 1981b, fig.1, no.4; Fensome et al., 2019a, fig.17I. Originally Hexagonifera, subsequently (and now) Senoniasphaera?. Questionable assignment: Lentin and Williams (1993, p.591). This name was not validly published in Singh et al. (1979, p.35–36), Khanna (1979, p.216) and Khanna et al. (1981, p.261), since no description was provided. Age: Early-Middle Eocene.
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Comments Fensome et al., 2019a:
Khanna & Singh (1981, p. 391) made the following statement in the diagnosis of this species regarding the wall structure: “… endophragm thick, broadly reticulate forming subcircular body; periphragm in the form of a thin, transparent membrane enclosing the body.”
They also remarked that “The periphragm … is detachable and occasionally … found separately in the form of a thin transparent sac. The lumina of the reticulum are narrow on the central part of the body whereas they widen out towards the periphery.” As the wall layers are thus apparently unconnected, we retain this species in Senoniasphaera, although it closely resembles some reticulate species of Canningia. For that reason we follow Lentin & Williams (1993) in questioning the generic assignment.
The name Hexagonifera reticulata was not validly published in Singh et al. (1979, p. 35–36), Khanna (1979, p. 216) and Khanna et al. (1981, p. 261) since no description was provided. This species is not synonymous with its invalid homonym Senoniasphaera? reticulata (see Wilson in Masure 1985, caption to fig.1b — p.202).
Stratigraphical occurrence. Khanna & Singh (1981) recovered this species from the Lower to Middle Eocene of northern India.
Senoniasphaera? reticulata (Khanna and Singh, 1981b, p.391, fig.1, nos.4,6; text-fig.3) Lentin and Williams, 1993, p.591. Holotype: Khanna and Singh, 1981b, fig.1, no.4; Fensome et al., 2019a, fig.17I. Originally Hexagonifera, subsequently (and now) Senoniasphaera?. Questionable assignment: Lentin and Williams (1993, p.591). This name was not validly published in Singh et al. (1979, p.35–36), Khanna (1979, p.216) and Khanna et al. (1981, p.261), since no description was provided. Age: Early-Middle Eocene.
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Comments Fensome et al., 2019a:
Khanna & Singh (1981, p. 391) made the following statement in the diagnosis of this species regarding the wall structure: “… endophragm thick, broadly reticulate forming subcircular body; periphragm in the form of a thin, transparent membrane enclosing the body.”
They also remarked that “The periphragm … is detachable and occasionally … found separately in the form of a thin transparent sac. The lumina of the reticulum are narrow on the central part of the body whereas they widen out towards the periphery.” As the wall layers are thus apparently unconnected, we retain this species in Senoniasphaera, although it closely resembles some reticulate species of Canningia. For that reason we follow Lentin & Williams (1993) in questioning the generic assignment.
The name Hexagonifera reticulata was not validly published in Singh et al. (1979, p. 35–36), Khanna (1979, p. 216) and Khanna et al. (1981, p. 261) since no description was provided. This species is not synonymous with its invalid homonym Senoniasphaera? reticulata (see Wilson in Masure 1985, caption to fig.1b — p.202).
Stratigraphical occurrence. Khanna & Singh (1981) recovered this species from the Lower to Middle Eocene of northern India.