Rothpletzella, Wood, 1948

Bucur, Ioan I., Granier, Bruno & Krajewski, Marcin, 2014, Calcareous Algae, Microbial Structures And Microproblematica From Upper Jurassic-Lowermost Cretaceous Limestones Of Southern Crimea, Acta Palaeontologica Romaniae 10 (1 - 2), pp. 1-2 : 77-79

Rothpletzella / Pseudorothpletzella -like structures

Fig. 16 h-j

Some crusts identified in the Kimmeridgian limestones of the Ay-Petri massif have a structure similar to that of representatives of the genera Rothpletzella and Pseudorothpletzella .

Microproblematica

Genus Crescentiella Senowbari-Daryan et al., 2008

Crescentiella morronensis (Crescenti, 1969) Senowbari-Daryan et al., 2008

Fig. 15 f-i

Previously known as Tubiphytes morronensis , this problematic microorganism was assigned by Senowbari-Daryan et al. (2008) to a new genus, Crescentiella . It is common and well-known in Upper Jurassic-Lower Cretaceous limestones. In the study area it was identified in Kimmeridgian limestones in the Ay-Petri massif.

Figures

Fig. 16 Cyanobacteria, microbial structures and Microproblematica from the Yalta-Ay Petri area, southern Crimea. a to g Rivulariacean-like cyanobacteria (mostly Cayeuxia sp. type). a, sample KA-6; b, sample KB-39; c, sample KB- 38f; d, sample KE-4c; e, sample KF-4; f, sample KB-51m; g, sample KC-27. h to j Microbial coating on large bioctast; somewhat Rothpletzella-like tubular structure; sample KB-41a. k Koskinobullina socialis Cherchi & Schroeder; sample KC-11; l Oncoid made up of thin micritic crusts separated by sparitic bands; sample KB-47n. Scale bar: 0.5 mm (a-f, h, l); 0.25 mm (g, i-k)

Fig. 15 Calcareous algae (Udoteaceae), Cyanobacteria, and Microproblematica from the Yalta-Ay Petri area, southern Crimea. a to c Arabicodium sp. in longitudinal oblique sections. a, sample KJ-23a; b, sample KC-11; c, sample KB-47a. d, e Nipponophycus ramosus Yabe & Toyama in oblique and transverse oblique (d) and longitudinal (e) sections; d, ample KB-25c; e, sample KB-39. f to i Crescentiella morronensis (Crescenti) in longitudinal and longitudinal-oblique (f-h) and transverse (i) sections; f, g, sample KC-7a; h, sample KB-38b; i, sample KC-7. j, k Girvanella sp. Sample KB-38f (k, enlargement of j). Scale bar: 0.25 mm (a-c, e, g, i-k); 0.5 mm (d, f, i).