Nezzazatinella cf. picardi ( Henson, 1947 )

Sun, Qi & Schlagintweit, Felix, 2024, First Record Of Upper Cretaceous (Campanian?) Larger Benthic Foraminifera From The Yigeziya Formation Of The Southwestern Tarim Basin, China, Acta Palaeontologica Romaniae 20 (2), pp. 131-144 : 140

Nezzazatinella cf. picardi ( Henson, 1947)

Fig. 7 h-k

1947 Valvulammina picardi n. sp. – Henson, p. 613, pl. 15, figs. 1, 3; pl. 17, figs. 3-6.

Remarks: The specimens from the Tarim Basin are here assigned with some reservations to Nezzazatinella picardi , a taxon described by Henson (1947) as belonging to Valvulammina from the Santonian of Egypt later transferred to Nezzazatinella Darmoian, 1976 . For this low trochospirally coiled form, Henson (1947) indicated about 11 chambers in the last whorl and a maximum observed test diameter of 1.10 mm with final chambers typically flaring. The rare (four) specimens from the Yigeziya Formation have test diameter from 0.87 mm to 1.70 mm overlapping with the type-material. We suspect that Henson (1947) had limited material available from the type-stratum or an assemblage with large forms lacking. In any case, a full taxonomic revision of different species attributed to Nezzazatinella is still pending ( Darmoian, 1976; Cherif et al., 1989; Chiocchini et al., 1994; Arriaga et al., 2016).

Figures

Fig. 7. Orbitolinidae indet. (a?, b-g), Nezzazatinella cf. picardi (Henson) (h-k), Cuneolina cf. parva Henson (l, r), Tetrataxiella? floriforma Schlagintweit & Sanders (m-n), rotaliids (Suturina? sp.) (o-p), cyclamminid gen. et sp. indet. (q) from the Campanian? Yigeziya Formation of the SW Tarim Basin, China. a. Slightly oblique axial section. b, c. Oblique sections. d. Tangential section showing the presence of a single rafter in the marginal zone. e-g. Tangential sections passing through the megalospheric biloculine embryo (detail in e) within the early trochospire. h, j-k. Oblique sections. i. Tranverse section through the last whorl of a juvenile specimen. l. Slightly oblique transverse section of the juvenile part. r. Slightly oblique longitudinal section perpendicular to the plane of biseriality. m Longitudinal section, slightly oblique. n. Oblique transverse section. o-q. Oblique sections. Abbreviations: deu = deuteroconch, pr = protoconch, r = rafter. Dotted line in e: Assumed boundary between protoconch and deuteroconch.