Cymopolia mayaense Johnson & Kaska, 1965

SCHLAGINTWEIT, FELIX, RASHIDI, KOOROSH & MOSAVINIA, ABDOLMAJID, 2021, First Record Of Calcareous Green Algae (Dasycladales, Halimedaceae) From The Paleocene Chehel Kaman Formation Of North-Eastern Iran (Kopet-Dagh Basin), Acta Palaeontologica Romaniae 17 (1), pp. 51-64 : 56

Cymopolia mayaense Johnson & Kaska, 1965

Figs. 3 c-d, 8a-e, g-h

*1965 Cymopolia mayaense n. sp. – Johnson and Kaska, p. 83-85, pl. 18, figs. 1-4.

2013 Cymopolia mayaense Johnson and Kaska – Granier in Granier et al., p. 283, Fig. 3.1-4 , pl. 4, figs. d-f, pl. 5, figs. a-i, pl. 6, figs. a-c, pl. 7, figs a-f, pl. 8, fig. e (with synonymy).

Remarks: C. mayaense represents a species showing a rather wide variability of article morphology and range of biometric data. The type-material of the Johnson collection has been recently revised by Granier in Granier et al. (2013). Characteristics of the Iranian specimens are a smooth inner surface, comparably small ovoid sporangia surrounded by 4 to 5 secondary laterals ( Fig. 8 c-e, h). Most specimens are represented by cylindrical segments (length up to 4.0 mm; diameter up to 0.9 mm). The primary laterals bearing numerous fertile ampullae at the distal end are shorther than the secondaries. In some samples, C. cf. mayaense shows an assemblage with the calcareous benthic foraminifera Rahaghia khorassanica (Rahaghi) ( Fig. 3c , 8g ).

Figures

Fig. 3 Algal-bearing bioclastic packstone-wackestone from the Paleocene Chehel Kaman Formation of northeastern Iran with Halimeda? sp. (H in a), Jodotella veslensis Morellet & Morellet (J in a-b), Cymopolia cf. mayaense Johnson & Kaska (c-d), Acicularia sp. 1 (A in a), bryozoans (br in a), and common Rahaghia khorassanica (Rahaghi) (c). Locality see Figure 2. Thin-sections Nf 12-2 (a), Nf 14 (b), Nf 6-2 (c-d).

Fig. 4 Acicularia sp. 1 (a-i, l-o), diverse oriented sections. Note the regular palisade-like arrangement of elongated cysts in h and the presence of a central hollow in some specimens (e.g., d, m). Acicularia sp. 2 (j-k) displaying spherical cysts. Thin-sections: Nf 12-1 (a, k), Nf 12-2 (b, d-e, g-j), Nf 12-3 (c, l), Nf 12 (f, m-o).

Fig. 8 Cymopolia cf. mayaense Johnson & Kaska (a-e, g-h) and Cymopolia sp. (f). a, Oblique transverse section. b, tangential section. c, tangential-oblique section. d, tangential section showing five secondaries (rectangle). e, longitudinal (above)-oblique (below) section. f, oblique transverse section. g, variously oriented sections together with Rahaghia khorassanica (Rahaghi) (left ablove). h, fragmentary tangential section showing five secondaries. Thin-sections: Nf 9 (a), Nf 6-2 (b, d, g), Nf 9 (c), Nf 8 (e), Nf 6-1 (f), Nf 4 (h).