Dicyclina simplex Cherchi & Schroeder, 1990a

Simmons, Michael, Bidgood, Michael, Consorti, Lorenzo & Schlagintweit, Felix, 2025, A Review Of The Identity And Biostratigraphy Of Cenomanian “ Larger ” Benthic Foraminifera: Part 2 - The Order Loftusiida (Excluding The Suborder Orbitolinina), Acta Palaeontologica Romaniae 21 (1), pp. 103-192 : 162

Dicyclina simplex Cherchi & Schroeder, 1990a

Figure 25

1964 Dicyclina schlumbergeri – Loeblich & Tappan, p. C303, fig. 209 (1a-1b); middle Cenomanian, France.

1967 Dicyclina schlumbergeri – Neumann, pl. 55, fig. 2; middle Cenomanian, western France.

1987 Dicyclina schlumbergeri – Loeblich & Tappan, pl. 157, figs. 8-10; middle Cenomanian, western France.

T 1990a Dicyclina simplex n. sp. Cherchi & Schroeder, p. 331, figs. 1-4; middle Cenomanian, western France.

1998 Dicyclina schlumbergeri – Charrière et al., fig. 4 (3a, 6); late Cenomanian, Morocco.

2009 Dicyclina schlumbergeri – Sari et al., pl. 3, figs. 8- 9; age uncertain, reworked, Turkish Taurides.

? 2013 Dicyclina sampoi – Ghanem & Kuss, fig. 13 (20- 21); middle Cenomanian, Syria.

? 2017 Dicyclina schlumbergeri – Rikhtegarzadeh et al., pl. 1, fig. 3; Cenomanian, Iranian Zagros [axial section that may be D. simplex or D. schlumbergeri ].

2018 Dicyclina schlumbergeri – Omidi et al., pl. 2, fig. 9; Cenomanian, Iranian Zagros.

? 2021 Dicyclina schlumbergeri – Saedi Razavi et al., pl. 1, fig. 3; Cenomanian, Iranian Zagros [axial section of D. simplex or D. schlumbergeri ].

Reference Images: Cherchi & Schroeder (1990a), figs. 1-4.

Taxonomy/Identity: D. simplex , first described from the middle Cenomanian of France, is the smallest of the Dicyclina species (max. diameter c. 3mm). It also has the most spherical and simple embryo compared with D. schlumbergeri and D. sampoi (the embryo of D. qatarensis has not been properly observed). It also has (relatively) the thickest post-embryonic test thickness of all Dicyclina species.

Confident Stratigraphic Range: middle – late Cenomanian.

Uncertain Stratigraphic Range: not applicable.

There are relatively few verified records of this species that was introduced by Cherchi & Schroeder (1990a) for material previously assigned to D. schlumbergeri from the middle Cenomanian of western France. The only other well dated record is that of Charrière et al. (1998) from the late Cenomanian of Morocco. Others (e.g. Omidi et al., 2018) have an undifferentiated Cenomanian age (but probably middle – late Cenomanian), whilst that of Sari et al. (2009) represents reworked material.

Geographic Distribution: Sporadic distribution, including western France, Morocco, the Turkish Taurides and Iranian Zagros.

Figures

Fig. 25. Representative illustrations of Dicyclina simplex: a Axial section, Cherchi & Schroeder (1990a, fig. 1, France); b Transverse oblique section, Cherchi & Schroeder (1990a, fig. 3, France); c Detail of embryo in fig. a, Cherchi & Schroeder (1990a, fig. 2, France); d Axial section of biserially arranged annular chambers, Sari et al. (2009), pl. 3, fig. 9, age uncertain, Turkish Taurides).