Boueina minima Bucur, Rashidi & Senowbari-Daryan

Bucur, Ioan I., Yarahmadzahi, Hamed & Mircescu, Cristian V., 2019, The Lower Cretaceous Tirgan Formation In The Gelian Section (Kopet Dagh, North Iran): Microfacies, Microfossils, And Their Biostratigraphic Significance, Acta Palaeontologica Romaniae 15 (1), pp. 13-33 : 28

Boueina minima Bucur, Rashidi & Senowbari-Daryan

( Fig. 12f,g ; Fig. 13d ).

This udoteacean alga was also described from the Taft Formation by Bucur et al. (2012). Just as in the case of Pseudoactinoporella ? iranica, it appears with two denominations: Boueina minima (in text, p. 625) and Boueina minuta (caption of Fig. 13 ) ( Bucur et al., 2012, p. 627). Boueina minima is the correct denomination of this taxon since it is mentioned as such for the first time in the text. This species is now reported for the first time in carbonate deposits other than those from the type locality.

Udoteacean-gymnocodiacean algae showing characteristics of both Boueina-Arabicodium, and Permocalculus ( Fig. 12e , j-m).

Some of the calcareous algae identified within the Tirgan Formation have ramified medullar and cortical filaments arranged in a manner similar to that described in Boueina and Arabicodium . At the same time, they also present a series of inflated, larger ovoid or ovoid-acuminated filaments. Such filaments are similar to the supposed reproductive organs of the gymnocodiacean algae. A similar alga is Boueina camenitzae ( Dragastan & Bucur, 1979) which contains such sub-ovoid filaments in the subcortical zone. When the inflated filaments are elongated, confusion with Juraella bifurcata is possible. A revision of these gymnocodiacean-udoteacean algae is currently undertaken by Bucur & Schlagintweit.

Figures

Fig. 12 Calcareous algae from the Tirgan Formation in the Gelian section. a, b Arabicodium sp. a, longitudinal section, sample G12; b, 0blique section, sample G35. c Boueina hochstetteri Toula; longitudinal-oblique section, sample G35. d Permocalculus (Pyrulites) deceneii Bucur; reconstruction based on 2 longitudinal-oblique sections, sample G18c. e, k-m Udoteacean-gymnocodiacean algae showing characteristics of both Boueina-Arabicodium, and Permocalculus: branching lateral and cortical filaments like in Boueina-Arabicodium, and large inflated filaments like the “reproductive structures” in Permocalculus; e, l, oblique sections; e, sample G15; l, sample G16a; k, m, transverse sections; k, sample G16a; m, sample G33. f, g Boueina minima Bucur, Rashidi & Senowbari-Daryan; f, longitudinal-oblique section, sample G15; g, oblique section, sample G16. h, i Boueina cf. pygmaea (Pia); longitudinal (h) and longitudinal-oblique (i) sections; h, sample G15; i, sample G13b. Scale bar is 0.25 mm.

Fig. 13 Calcareous algae from the Tirgan Formation in the Gelian section. a, b, e-g, i Boueina cf. pygmaea (Pia); a, b, e, g, transverse sections; a, sample G13b; b, e, sample G16; f, g, sample G16a; i, oblique section, sample G17c. c Boueina hochstetteri Toula, transverse section, sample G17a. d Boueina minima Bucur, Rashidi & Senowbari-Daryan, transverseoblique secton, sample G15. h, j, k Permocalculus sp.; transverse (h, k) and oblique (j) sections; h, sample G17b; j, sample G24a; k, sample G17a. Scale bar is 0.25 mm.