Probolocuspis? tenuiparia, Senowbari-Daryan, 2014

Senowbari-Daryan, Baba, 2014, Dasycladales Algae From The Norian-Rhaetian Reef Carbonates Of Argolis Peninsula, Greece, Acta Palaeontologica Romaniae 10 (1 - 2), pp. 1-2 : 42

Probolocuspis? tenuiparia nov. sp.

( Fig. 5 e-l)

Derivatio nominis: Tenuis (latin) = thin, and paries (latin) = wall. Named from the thin thallus wall of the species.

Holotype: Fig. 5h .

Locus typicus: Norian-Rhaetian reef carbonates north of the nearby town Sarmeika ( Fig. 1 ).

Stratum typicum: Norian-Rhaetian reef carbonates.

Diagnosis: Cylindrical thallus with thin wall and wide axial cavity. Laterals, corresponding to the thin thallus wall, are short. Individual laterals are visible only as small spines on the outer surface of the thallus.

Material: Numerous species in several thin sections.

Description: Similar to the preceding described species most specimens of this alga are cut in cross sections. The thallus walls of all specimens are recrystallized, the nature of laterals is visible only as small spines on the outer surface of the thallus. The arrangement of the laterals is not clear and therefore the attribution to the genus Probolocupsis is uncertain.

The specimen designated as holotype ( Fig. 5h ) is an oblique to longitudinal section exhibiting clearly the tip of the needle- or spine-like individual laterals on one side. Some specimens ( Fig. 5 e-f, j-k), cut in cross sections clearly show this character of the thallus. For the biometrical data and dimensions of the thallus see Table 2.

Figures

Fig. 5 Diplopora obliguspora nov. sp. (a to d) and Probolocuspis tenuiparia nov. sp. (e to l) from the Norian-Rhaetian reef carbonates of Sarmeika, Peloponnes, Greece. a Specimen exhibits the thin wall around the axial cavity and the spine-like extended laterals. Thin section G1, x32. b Similar section as Fig. a showing the common base of oblique orientation of individual laterals. Thin section G89, x12. c (Holotype). Longitudinal section exhibiting the metaspondyle arrangement of the laterals, tuft of laterals and the thin wall around the axial cavity (for more information see Fig. 3). Thin section G75, x8. d Two cross sections exhibiting the spine-like extended individual laterals. G12, x20. e Cross sections through several specimens with thin thallus wall. Thin section G012, x20. f Sections through three specimens with relatively thick thallus wall but the individual laterals are recognizable. Thin section G08a, x25. g Oblique to longitudinal section. Thin section G08a, x20. h Holotype. The oblique section shows the individual laterals at the base. Thin section G08a, x20. i Sections through four specimens showing the laterals in part. Thin section G08a, x20. j Sections similar to Fig. i. Thin section G08a, x20. k Cross sections clearly showing the spine-like extended laterals. Thin section G08a, x40. l Similar to k. Thin section G40/1, x12.

Fig. 1 Geographic position of the Norian-Rhaetian reef locality north of the town of Sarmeika, Peloponnes, Greece.